ABZMS-37-1X/0370-03-N-T70F-K24

Manufacturer: Bosch Rexroth

Material #: R901195886

Model : ABZMS-37-1X/0370-03-N-T70F-K24

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth ABZMS-37-1X/0370-03-N-T70F-K24 (R901195886) is a sophisticated float switch designed for fluid level control in power unit tanks. This device is part of the Type M series, which includes a combination of features such as a breathing filter, level monitoring, and temperature measurement with visual and electronic displays. Equipped with a breather filter that has a filtration rating of 3 µm absolute, the ABZMS-37-1X/0370-03-N-T70F-K24 ensures clean air enters the tank while preventing contamination. Its visual analog clogging indicator displays the filter element's contamination level percentage, which aids in maintenance scheduling. The level switch function within this model utilizes two reed contacts—normally closed and normally open—affected by a permanent magnet in the float. These contacts switch when the oil level changes, maintaining their position until the float moves past these points again. Factory-set switching points are adjustable within the device for precise control over oil volume indications. Temperature measurement is another key feature of this float switch. A PT100 sensor is used to measure temperature accurately, with readings displayed on an LED screen in Celsius or Fahrenheit. The display also communicates status messages for easy monitoring. For temperature signal functions, settings can be adjusted using three keys on the control device to prevent unauthorized access. This ensures that temperature signals remain reliable and consistent according to user specifications. Overall, the Bosch Rexroth ABZMS-37-1X/0370-03-N-T70F-K24 float switch offers robust functionality for fluid level and temperature management within industrial power unit tanks, providing both visual indicators and electronic outputs for comprehensive monitoring and control.

$1,359.98 USD

More are expected on May 14, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 14, 2025 when ordered in

Float switches are switching devices operated by a float moved by fluid. These are used to control fluid levels in power unit tanks.

Three series are available:

Float switches type …M consisting of a breathing filter, level monitoring (max./min.) and temperature measurement and display with two adjustable alarm outputs Float switches type …N consisting of a breathing filter, level monitoring (max./min.) and temperature measurement with one contact Float switches type …R consisting of a breathing filter, a resistance measuring chain for level, a resistance thermometer for temperature with analog output from 4 to 20 mA and an analog temperature display

Float switch type ...M

Tank venting function

Breather filter with filtration rating of 3 µm absolute.

The visual analog clogging indicator shows the increase in the degree of contamination of the filter element in percent.

Level switch function

Two reed contacts are provided in the sliding tubes (normally closed contact and normally open contact), which are switched by the permanent magnet installed in the float.

When the float reaches the switching points while the oil level is falling, the contacts are operated by magnetic force. The positions of the contacts are maintained until the float passes the switching points again when the oil level is rising.

The switching points are factory-set (for values, see "Oil volume indication").

As a standard, switching point L1 is installed as a normally closed contact, and switching point L2 as a normally open contact.

The switching points can be adjusted within the device (for instructions, see "Oil volume indication").

The switching function can be changed by rotating the contacts through 180°; the normally closed contact becomes a normally open contact and vice versa.

Temperature display

The current temperature is shown on a clearly visible LED display, which also signals status messages. The temperature is displayed in °C or °F.

Temperature signal function

Temperature is sensed by a PT 100.

The two temperature signals can be adjusted by means of the three keys provided on the control device.

The settings are protected against unauthorized access through programming guidance (see "Commissioning - operating and installation instructions").

Float switch type ...N

Tank venting function

Breather filter with filtration rating 3 µm absolute.

The visual analog clogging indicator shows the increase in the degree of contamination of the filter element in percent.

Level switch function

Two reed contacts are provided in the sliding tubes (normally closed contact and normally open contact), which are switched by the permanent magnet installed in the float.

When the float reaches the switching points when the oil level is falling, the contacts are operated by magnetic force. The positions of the contacts are maintained until the float passes the switching points again when the oil level is rising.

The switching points are factory-set (for values, see table on "Oil volume indication").

As a standard, switching point L1 is installed as a normally closed contact, and switching point L2 as a normally open contact.

The switching points can be adjusted within the device (for instructions, see "Oil volume indication").

The switching function can be changed by rotating the contacts through 180°; the normally closed contact becomes a normally open contact and vice versa.

Temperature signal function

Temperature is sensed by a PT 100.

A bimetal plate, which is influenced by temperature, switches when the firmly set response temperature is reached.

Float switch type ...R

Tank venting function

Breather filter with filtration rating 3 µm absolute.

The visual analog clogging indicator indicates the increase in the degree of contamination of the filter element in percent.

Level switch and temperature signal function

The sliding tube accommodates the resistance measuring chain with a resolution of 7.5 mm for continuous monitoring of the fill levels.

Permanent magnets installed in the float switch the contacts and activate a resistance.

The resistance thermometer (PT100) for temperature sensing is also integrated in the sliding tube.

A measuring transducer, which is integrated in the connected housing, converts the level- and temperature-related signal into a linear current change of 4 to 20 mA.

Temperature display

A clearly visible LED display indicates the current temperature.

The temperature is shown in °C or °F (how to change the indication is described at "Commissioning - operating and installation instructions").

Ordering code

01	02		03		04		05		06		07		08		09		10
ABZM	S	‒	37	‒	1X	/		‒	03	‒		‒		‒		‒	K24

Power unit accessories
01	Measuring devices	ABZM
02	Float switches	S
03	Version	37
04	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)	1X
Ordering length in mm
05	L = 370 mm	0370
	L = 500 mm	0500
	L = 800 mm	0800
	L = 1.000 mm	1000
	L = 1.200 mm	1200
Breathing filter
06	Filter rating 3 μm	03
Functions
07	Level: with 2 switching contacts (normally closed contact/normally open contact) Temperature: with 2 switching outputs with temperature display and control unit	M
	Level: with 2 switching contacts (normally closed contact/normally open contact) Temperature: with 1 switching contact (normally closed contact)	N
	Level: with resistance measuring chain (analog output 4 to 20 mA) Temperature: with resistance thermometer (analog output 4 to 20 mA), with temperature display	R
Temperature contact
08	Version M
	Without temperature contact	no code
	Version N
	Switching contact normally closed contact at 60 °C	T60F
	Switching contact normally closed contact at 70 °C	T70F
	Switching contact normally closed contact at 80 °C	T80F
	Version R
	With resistance thermometer	no code
Option
09	With adapter flange	no code
09	Without adapter flange 1)	F
Electrical connection 2)
10	Connector, 4-pole M12 x 1	K24

1)	Design without adapter flange for fluid manager (see R.50230)
2)	The mating connectors are not included in the scope of delivery and must be ordered separately, if required (see R.08006)

	Order example:
	Float switch with flange connection, with breathing filter, with temperature display and control unit, with two pre-set switching contacts (level and temperature), ordering length 370 mm and electric connection K24 for round connector M12 x 1:
	ABZMS-37-1X/0370-03-M-K24

Resistance

Hydraulic fluids
Mineral oils	Mineral oil	HLP	according to DIN 51524	Resistant
Flame-resistant hydraulic fluids	Emulsions	HFA-E	according to DIN 24320	Resistant
	Water solutions	HFC	according to VDMA 24317	Resistant
	Phosphoric acid esters	HFD-R		Not resistant
	Organic esters	HFD-U		Not resistant
Fast bio-degradable hydraulic fluids	Triglycerides (rape seed oil)	HETG	according to VDMA 24568	Resistant
	Synthetic esters	HEES
	Polyglycols	HEPG

electrical

Plug-in connection	4-pole M12 x 1 (material: metal)

Reed contacts of the float switches
with connection K24 for mating connector M12 x 1; 4-pole

Switching voltage range	V DC	10 … 30
Maximum switching current	A	0.5
Maximum switching power	W	10

Temperature display

Temperature display range		°C	-20 … +120
Alarm temperature adjustment range	only with type …M	°C	0 … 99
Maximum programmable switching points			2
Housing design			PA, IP65
Current consumption upon switch-on	more than 100 ms	mA	≈ 140
Current consumption during operation		mA	≈30 … 50
Power supply		V DC	24 ±10
Outlet			PNP
Resolution		°C	1
Operation			3 keys
Temperature sensor			Pt100

Resistance measuring chain and resistance thermometer
with connection K24 for mating connector M12 x 1; 4-pole

Switching voltage range	V DC	10 … 30
Outlet	mA	4 … 20
Resolution resistance measuring chain	mm	7.5
Maximum load resistance		R = UB ‒ 7,5 V (0,02 A)
Residual ripple	%	1
Temperature measuring range	°C	0 … 100

For applications outside these parameters, please consult us!

Type …M

With two switching contacts, two temperature contacts, temperature display and control unit

Type …N

With two switching contacts and one temperature contact

Type …R

With resistance measuring chain/resistance thermometer

Dimensions: Float switch type ...M

With breathering filter, with two adjustable switching contacts for level, with temperature indicator and two adjustable temperaturesignals in the control device, Plug-in connection M12 x 1, max. 30 VDC
Dimensions in mm

1	Breathing filter
2	Mating connector for plug-in connections K24 (M12 x 1), see table "Mating connector"
3	Flat seal
4	Switching points
5	Connector K24; 4-pole M12 x 1
6	Name plate
7	Float switch variant L up to 370 mm without protective tube
8	Float switch variant L 500 mm or longer with protective tube
9	Tube Ø 20 mm
10	Bore pattern 6 x 60° to DIN 24557 part 2
11	Float with permanent magnet, radially magnetized, north pole inside (dimensions: Ø51 x 57; Material 1.4571)
12	Mounting screw M5 x 20 (adapter flange to tank)
13	Mounting screw M5 x 80 (float switch to adapter flange)
14	Space required to remove the mating connector
15	Adapter flange (not required when mounted on Fluid Manager ABZMF...)
Dimensions L, L1 and L2, see "Oil volume indication"

Pinout

Switching function with plug-in connection M12 x 1
M12 plug-in connector A		Pin assignment
		1 =	max. 30 VDC
		4 =	level / L2
		2 =	level / L1
M12 plug-in connector B		Pin assignment
		1 =	max. 30 VDC
		4 =	temperature switching point 1 (freely adjustable from 0 to 100 °C)
L1 =	Normally closed contact at min. value, falling	2 =	temperature switching point 2 (freely adjustable from 0 to 100 °C)
L2 =	Normally open contact as early warning, falling	3 =	GND

Dimensions: Float switch type ...N

With breathering filter, one thermal contact and two adjustable switching contacts for level, plug-in connection M12 x 1, max. 30 VDC
Dimensions in mm

1	Breathing filter
2	Mating connector for plug-in connections K24 (M12 x 1), see table "Mating connector"
3	Flat seal
4	Switching points
5	Connector K24; 4-pole M12 x 1
6	Name plate
7	Float switch variant L up to 370 mm without protective tube
8	Float switch variant L 500 mm or longer with protective tube
9	Tube Ø 20 mm
10	Bore pattern 6 x 60° to DIN 24557 part 2
11	Float with permanent magnet, radially magnetized, north pole inside (dimensions: Ø51 x 57; Material 1.4571)
12	Mounting screw M5 x 20 (adapter flange to tank)
13	Mounting screw M5 x 80 (float switch to adapter flange)
14	Space required to remove the mating connector
15	Adapter flange (not required when mounted on Fluid Manager ABZMF...)
Dimensions L, L1 and L2, see "Oil volume indication"

Pinout

Switching function with plug-in connection M12 x 1
M12 plug-in connector A	Pin assignment
	1 =	max. 30 VDC
	4 =	level / L2
	2 =	level / L1
M12 plug-in connector B	Pin assignment
	1 =	max. 30 VDC
	2 =	Temperature contact

Dimensions: Float switch type ...R

With breathering filter, with resistance measuring chain (level), with temperature indicator and resistance thermometer (temperature) with two analog otuputs 4 to 20 mA, plug-in connection M12 x 1, max. 30 VDC
Dimensions in mm

1	Breathing filter
2	Mating connector for plug-in connections K24 (M12 x 1), see table "Mating connector"
3	Flat seal
4	Switching points
5	Connector K24; 4-pole M12 x 1
6	Name plate
7	Resistance thermometer (PT100)
8	Bore pattern 6 x 60° to DIN 24557 part 2
9	Mounting screw M5 x 20 (adapter flange to tank)
10	Mounting screw M5 x 80 (float switch to adapter flange)
11	Float switch variant L up to 370 mm without protective tube
12	Float switch variant L 500 mm or longer with protective tube
13	Space required to remove the mating connector
14	Adapter flange (not required when mounted on Fluid Manager ABZMF...)
Dimensions L, L1 and L2, see "Oil volume indication"

Oil volume specification for float switch

Types ...M and ...N with factory-set switching points

1	Residual quantity with switching point L1
2	Residual quantity with switching point L2

Float switch Ordering length "L"	Switching points pre-set		Residual hydraulic fluid volume at switching point
			AB 40-40, AB 40-43, AB 40-44
	L1	L2	NG	L1	L2
mm	mm	mm		l	l
500	220	140	63	28	42
	220	140	100	45	67
	220	140	160	74	100
	220	140	250	120	174
	220	140	400	190	277
	220	140	630	365	475
	220	140	800	460	600
	280	160	1000	490	740
	280	160	1250	780	1030
	280	160	1600	990	1310
	280	160	2000	1380	1730
800	600	400	-	-	-
1000	700	500	-	-	-
1200	800	600	-	-	-

Attention!

Before commissioning, adjust the upper and lower switching contact according to the relevant operating conditions.

Adjustment of the switching height

Interrupt the power supply Remove filter cover and take filter element out Loosen six mounting screws and remove filter reservoir Loosen four screws of the flange cover and remove cover with cover seal Carefully remove adapter plug from contact strip (Attention! Some cables of the adapter plug are firmly soldered to the control device). Carefully take out contact strip to the top Loosen the plastic screws at the contacts and re-position contacts with the help of the cm scale, which is provided at the rear of the contact strip. The height can be adjusted in 1 cm increments. Tighten the plastic screws for contact mounting hand-tight. During the assembly, take care that the adapter plug is plugged correctly onto the contact strip.The correct direction is shown by the red marking on the adapter plug and the contact strip.

As a standard, the contacts for switching point L1 are installed as normally closed contact, and for switching point L2 as normally open contact. Since these are bistable contacts, the contact function of the normally open contact and the normally closed contact can be changed by rotating the contacts around 180°.

Type ...R

in tank according to AB 40-40, AB 40-43 and AB 40-44

Tank size DN100 to 800
Dimensions in mm

Tank size DN1000 to 2000
Dimensions in mm

Installation opening of the tank cover

Dimensions in mm

Standard breakthrough AB 03-39.73 similar to DIN 24557 part 2

Fastening screws:

6 HEXAGONSOCKET HEAD CAP SCREWS ISO4762-M5X18-8.8-A2P; Material no. R900202612

Adapter for float switch AB 31-04

If float switches according to R.50216 are installed as replacement for float switches according to AB 31-04, an adapter - consisting of item 1 to 3 - is necessary.

ADAPTER AB31-04/AB31-36 BG, material no. R901078947

Assembly sequence:

1. Assemble the adapter flange at the tank

2. Assemble the float switch at the adapter flange

Dimensions in mm

1	Adapter flange
2	Flat seal
3	4 hexagon socket head cap screw M8 x 16

Installation information

Vertical installation according to technical data (see “Technical data”) Avoid flows Do not expose the switch to heavy impacts and bends Avoid external magnetic fields. Thus, the function of the reed contacts may be impaired.

Electrical connections:

Electrical connections may only be established by specialists Before works at electric parts, the voltage supply is to be interrupted Tighten the round connectors M12 x 1 and/or mating connectors after connection Only plug in the round connectors M12 x 1 and/or mating connectors in the de-energized condition Do not overload the contacts (see technical data) In case of inductive load provide a protection circuit!

Operating and installation instructions for float switch type ...M with control device

General operating notes

The temperature switching points can be changed or adjusted by means of three keys ( Δ )+( ∇ )+(MODE).

To this end you have to select the individual menu items by pressing key (MODE) and one of the keys ( Δ ) or ( ∇ ).

When you navigate through the menus, the relevant menu name is shown on the display.

You can change the values in the relevant menu item by pressing key ( Δ ) or ( ∇ ). When you press the key (MODE) alone, the active place in the display changes over (units to tens digit and vice versa). This possibility was provided to simplify the entry of parameters. The active digit is marked by a flashing dot.

If you scroll beyond the end of the menu (upwards or downwards), the display changes back to the normal operating mode.

If no key is pressed and/or no parameter changed for 15 seconds, the menu is exited automatically and the display changes over to the normal operating mode. To return to the menu, you have to press the two keys ( Δ ) + (MODE) again.

After the menu was exited, all new parameters are automatically and permanently saved. All parameters are written to an internal EEPROM and are retained even in the case of a power failure.

Adjustment of the switching points (only for display with switching outputs)

Each switching output are assigned TWO parameter menus in the menu. For the first switching output, these can be, for example, menus 100 and 101. 100 refers to the switching back point (RESET) of output 1, and 101 the switching-on point (SET) of output 1. Due to the separate input of both parameters, it is possible to set an almost optionally great switching hysteresis for the corresponding switching output. In addition, it is possible to change the switching function of the output from a normally open contact to a normally closed contact by exchanging the values of the switching-on point (SET) and the switching-off point (RESET).

Example 1:

For 100 (RESET) a value of 40 is set.

For 101 (SET) a value of 45 is set.

Result:

Output 1 closes at 45° when the temperature is rising, and only opens when the temperature has fallen to 40°.

Switching function: Normally open contact at rising temperature

Example 2:

For 100 (RESET) a value of 45 is set.

For 101 (SET) a value of 40 is set.

Result:

Output 1 opens at 45° when the temperature is rising and only closes again when the temperature has dropped to 40°.

Switching function: Normally closed contact while the temperature is rising.

Switching the device on

After connection of the supply voltage the device runs some self-tests. These are shown on the display.

Display	Status displays
	First, all segments of the display are switched on for checking purposes.
	The following indication means that all memory contents, e.g. for switching points or calibration of the 4 … 20 mA output, are OK. The last place on the display shows another value depending on the variant.
	Finally, the software version of the control device is displayed.
	The control device is now in the normal operating mode. The actual temperature is displayed.

Status indicator lamps of the device

During normal operation, the status indicators light up in addition to the temperature indication.

Display	Status displays
	The two LED segments on the right flash when the corresponding switching temperature of the relevant output has been reached (only for switching devices with switching outputs).
	During normal operation, the dot in the bottom right corner flashes. It serves as ready indicator and shows that the device functions properly.
	If you are in the adjustment or calibration menu, the point is permanently on until you exit the menu again.

Faults

Display	Cause	Remedy
No function	No operating voltage	Check operating voltage
	Short-circuit in cable or PT100	Replace contact strip
	PT 100 defective Cable connection is interrupted	Replace contact strip Connect cable connection
	General malfunction. In this case, all functions of the control device are inoperable.	Contact our Service: Tel. +49 93 52 18-11 64
	The two central dots are flashing during normal operation when the memory contents may be damaged.	Check the settings. If required, contact our Service: Tel. +49 93 52 18-11 64

Changing the displayed unit

Display	Operation
	Unlock keylock. Press (Δ) + (MODE) SIMULTANEOUSLY.In the first and third place, 3 horizontal dots are displayed, while the second place counts down from 9 to 0.
	Then, the display on the left appears. The keys can now be released.
	On the current display you can change the temperature indication from degrees Celsius to degrees Fahrenheit by pressing the (∇) key.

Adjustment of the switching points

Display	Status displays
	To go to the adjustment menu for the switching-off point of the first output, press the (MODE) + (Δ) keys. After having released the (MODE) key you can change the values with the help of keys (Δ) + (∇).
	To go to the adjustment menu for the switching-on point of the first output, press the (MODE) + (Δ) keys. After having released the (MODE) key you can change the values with the help of keys (Δ) + (∇).
	To go to the adjustment menu for the switching-off point of the second output, press the (MODE) + ( Δ ) keys. After having released the (MODE) key you can change the values with the help of keys (Δ) + (∇).
	To go to the adjustment menu for the switching-on point of the second output, press the (MODE) + (Δ) keys. After having released the (MODE) key you can change the values with the help of keys (Δ) + (∇).

Normative cross-reference

AB 03-39.73

Normdurchbruch, Einfülladapter für VW und DB-Norm

AB 24-02

Kabelsätze und Verteiler

R.50212

Float switches with two switching contacts and one thermal contact

R.50214

Float switches with two switching contacts and with one thermal contact, with resistance measuring chain/resistance thermometer

AB 40-40

Steel reservoirs, form AN, cover form C, drip tray to WHG

AB 40-43

Steel reservoirs, cover form C

AB 40-44

Steel reservoirs, with base frame

R.08006

Cable sockets for controlling electrically operated valves and sensors

DIN 24320

Fire resistant fluids; hydraulic fluids of category HFAE, properties, requirements

DIN 24557-2

Fluid power; breather filters; connecting dimensions

DIN 51524

Pressure fluids; hydraulic oils

ISO 4762

Hexagon socket head cap screws

VDMA 24317

Fluidtechnik; biologisch schnell abbaubare Druckflüssigkeiten; Technische Mindestanforderungen

VDMA 24568

Fluidtechnik; biologisch schnell abbaubare Druckflüssigkeiten; Technische Mindestanforderungen

94/9/EC (ATEX)

Directive 94/9EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres

Mating connectors

For detailed information see data sheet 08006
Mating connector for connector K24		Mating connector for connector K24 with potted-in PVC cable, 3 m long

Denomination	Part number	Denomination	Part number
LEITUNGSDOSE 4P Z24 SPEZ	R900031155	LEITUNGSDOSE 4P Z24M12X1+3MSPEZ	R900064381

Spare parts & repair

Use in potentially explosive atmospheres according to Directive 94/9/EC (ATEX)

Float switches ABZMS-37 are not suitable for use in potentially explosive atmospheres.

ABZMS-37-1X/0370-03-N-T70F-K24

Manufacturer: Bosch Rexroth

Material #: R901195886

Model : ABZMS-37-1X/0370-03-N-T70F-K24

More are expected on May 14, 2025

Float switch type ...M

Float switch type ...N

Float switch type ...R

Ordering code

Resistance

electrical

Reed contacts of the float switches with connection K24 for mating connector M12 x 1; 4-pole

Temperature display

Resistance measuring chain and resistance thermometer with connection K24 for mating connector M12 x 1; 4-pole

Type …M

Type …N

Type …R

Dimensions: Float switch type ...M

Pinout

Dimensions: Float switch type ...N

Pinout

Dimensions: Float switch type ...R

Oil volume specification for float switch

Type ...R

Installation opening of the tank cover

Adapter for float switch AB 31-04

Installation information

Operating and installation instructions for float switch type ...M with control device

Faults

Changing the displayed unit

Adjustment of the switching points

Normative cross-reference

Mating connectors

Use in potentially explosive atmospheres according to Directive 94/9/EC (ATEX)

Related Products

Information

Account

Reed contacts of the float switches
with connection K24 for mating connector M12 x 1; 4-pole

Resistance measuring chain and resistance thermometer
with connection K24 for mating connector M12 x 1; 4-pole