Accessories for R901269281

FLOAT SWITCH ABZMS-41-1X/0800/RTA/DC-K24

Manufacturer: Bosch Rexroth

Material #: R901269281

Model : ABZMS-41-2X/0800/RTA/DC-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-41-1X/0800/RTA/DC-K24 (R901269281) is a sophisticated float switch with an integrated temperature sensor designed for precise fluid level and temperature monitoring. This device offers surge protection and features a resistance measuring chain for level detection, as well as a resistance thermometer for temperature measurement, with analog connections ranging from 4 to 20 mA. It is capable of handling a maximum pressure and comes with an electrical connection characterized by a Connector pole, M12 standard. The product is suitable for use with various hydraulic fluids including HLP, HFAE, HFC, HFDR, HFDU, HETG, HEES, and HEPG. It conforms to CE standards for electromagnetic compatibility within the EU and boasts an M12 A-coded electrical connector. The unit includes a display and supports a supply voltage range from 18 to 32 VDC. Its design permits easy customization of switching points within the device by simply rotating the contacts. The ABZMS-41-1X/0800/RTA/DC-K24's level function employs adjustable reed contacts that are actuated by permanent magnets in the float to maintain spool positions until the fluid level changes again. The resistance measuring chain ensures continuous recording of filling levels with high resolution. For temperature monitoring, it incorporates bimetal temperature contacts at its lowest point or optionally uses PT100 sensors or resistance thermometers with analog output. The model also includes a microprocessor-controlled display and control unit that allows users to set and read level and temperature settings easily via LED display and pushbuttons. This Bosch Rexroth float switch provides versatile application possibilities due to its robust design, precision measurement capabilities, and user-friendly interface. It is engineered to ensure reliable operation in diverse environments where accurate fluid level and temperature control are essential.

$1,445.86 USD

More are expected on May 5, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 5, 2025 when ordered in

FLOAT SWITCH ABZMS-41-1X/0800/RTA/DC-K24

Float switch combined with temperature sensor

Unpacked Weight: 2.37 kg

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 typeABZMS…M with a maximum of four adjustable switching contacts normally closed contact/ normally open contact or a maximum of three switching contacts and optionally fixedly set temperature contact as normally closed contact for 60 °C, 70 °C or 80 °C Float switches type ABZMS…RTA with resistance measuring chain (level) and resistance thermometer (temperature) with analog output from 4 to 20 mA. Float switches type ABZMS…D with resistance measuring chain and resistance thermometer as with type ABZMS...RTA and additional display and control unit for level and temperature setting.

Level function

Level contacts:

The sliding tubes contain the adjustable reed contacts (normally closed contact and normally open contact) that are switched by the permanent magnets installed in the float.

If with decreasing oil level, the float reaches the switching points, the contacts are magnetically operated. The spool positions of the contacts are maintained until the float passes the switching points once again due to the increasing oil level.

The switching points can be adjusted in the device.

Rotating the contacts by 180° changes the switching function; the normally closed contact type becomes a normally open contact or vice versa.

Resistance measuring chain:

The sliding tube contains the resistance measuring chain (contact distance 5 mm / resolution) for the continuous recording of the filling level height. If the individual reed contact is switched (closed) by the permanent magnet located in the float, a resistance will in each case be activated.

The added resistance value is converted by a transformer into 4 … 20 mA.

Temperature function

Temperature contact:

At the lowest point within the sliding tube, the bi-metal temperature contacts are attached to the circuit board and secured by means of a shrinkable tubing (the same procedure is used with the versions with PT 100 temperature sensor and resistance thermometer with analog output 4 … 20 mA). If the desired temperature switching point is reached, the bi-metal contact is opened or closed.

Temperature sensor PT100:

The PT100 consists of a temperature sensor guaranteeing continuous temperature recording. In this connection, the max. cable length of [si]6 m[/si][mp]236 in[/imp] is to be observed.

Resistance thermometer with measuring transducer, output 4 … 20 mA:

The PT100 resistance thermometer with measuring transducer is also attached to the circuit board in the sliding tube. The temperature-dependent signal is converted into a linear current change from 4 … 20 mA.

Display and control unit function (version D)

The micro-processor controlled display and control unit processes the analog input signals for the analysis of the level and temperature control. Level and temperature can be set at the control unit in an easy menu navigation by means of pushbuttons and the settings can be read off at the LED display.

The display and control unit has a four-digit, red seven-segment LED display and 3 pushbuttons for the operation as well as up to 4 LEDs integrated in the front plate for the display of alarm conditions.

Apart from that, the device has four freely adjustable PNP switching outputs plus the adjustable switch-back points (version D1) and alternatively (version D2) two freely programmable PNP switching outputs and 2 x 4 … 20 mA output for the continuous measurement of oil level and temperature. The switching conditions are shown in the display.

The output 4 … 20 mA can optionally be set to 0 … 10 V, 2 … 10 V or 0 … 5 V.

Depending on the setting, the display shows the measured temperature or filling level value in the desired unit (°C, °F, L, cm, %, inch or mm). By default, the temperature display is set to °C.

During the setting and/or programming of the corresponding process parameters, the parameter values and/or the related menu items are shown in the display.

In case of energy supply failure, all input values will be stored, the max/min values can be called from a permanent memory, if necessary.

Parameterization

The menu navigation is based on the VDMA standard sheet for fluid sensors 24574-1.

The operating menu is designed hierarchically as tree structure.

That means that frequently used functions and adjustment points are quickly accessible and rarely used menu items can be found in a submenu.

Using the ▲ and ▼ keys, the corresponding parameters are set and/or the next menu item is displayed.

Using the ► key, the selected menu item is selected and/or the set parameter is accepted and stored.

The parameter may be a numerical value and a selection of functions (e.g. NO [output as normally open contact], NC [output as normally closed contact] or i1 [analog output 4 … 20 mA]).

After confirmation of a parameter or function selection by means of the ► key, the display will switch back to the current menu item. Then, you can use ▲ and ▼ to display the next menu item and ► to select it.

Surge protection
Float switches are switching devices operated by a float moved by fluid.
With resistance measuring chain / resistance thermometer
2 analog connections (4 to 20 mA)

Data Sheet	Download Data Sheet
3D CAD	Download 3D CAD
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Max. pressure	1
Electrical connection description	Connector, 4-pole, M12 x 1, coding A according to EN 61076-2-101
Productgroup ID	9,10,11,12,13,14
Conformity description	CE – electromagnetic compatibility 2014/30/EU
Length	800
Display	yes
Supply voltage	10...36 VDC
Weight	2.37
Output signal	2 x 4 … 20 mA
Hydraulic fluid	HLP,HFA-E,HFC,HFDR,HFDU,HETG,HEES,HEPG
Conformity	CE

Ordering code

01	02		03		04		05		06		07		08
ABZM	S	‒	41	‒	1X	/		/		/		‒

Power unit accessories
01	Measuring devices	ABZM
02	Float switches	S
03	Version	41
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 = 1000 mm	1000
	L = 1200 mm	1200
Level and temperature measurement 1)
06	Number of level contacts normally closed contact/normally open contact 2)
	1 x	M1
	2 x	M2
	3 x	M3
	4 x	M4
	Number of level contacts normally closed contact/normally open contact and temperature contact 70 °C normally closed contact 3)
	1 x	M1-T70F
	2 x	M2-T70F
	3 x	M3-T70F
	Number of level contacts normally closed contact/normally open contact and temperature sensor PT100, output resistance signal Ω
	1 x	M1-TS
	2 x	M2-TS
	3 x	M3-TS
	Number of level contacts normally closed contact/normally open contact and resistance thermometer, output 4 … 20 mA
	1 x	M1-TA
	2 x	M2-TA
	3 x	M3-TA
06	Resistance measuring chain (level) and resistance thermometer analog output 4 … 20 mA	RTA
	Display and control unit with resistance measuring chain and resistance thermometer with four programmable PNP switching outputs	D1
	Display and control unit with resistance measuring chain and resistance thermometer with two programmable PNP switching outputs and two analog outputs 4 … 20 mA	D2
Voltage
07	VDC 10 … 36	DC
07	VAC 10 … 230	AC
	Without temperature contact	no code
Electrical connection 4)
08	Connector, 4-pole M12 x 1 (standard)	K24
	Connector 4-pole (3 + PE) DIN EN 175301-803	K14
	Connector 7-pole (6 + PE) DIN EN 175201-804	K6

1)	Combination possibilities function / electrical connection
2)	Pinout, see “Electrical connection”
3)	Option: Temperature contact 60 °C = T60F Temperature contact 80 °C = T80F
4)	Mating connectors, separate order (see R.08006)

	Order example:
	Float switch with flange connection, ordering length 370 mm, two pre-set level contacts and temperature contact, normally closed contact at 70 °C, connector K24:
	ABZMS-S-41-1X/0370/M2-T70/DC-K24

Function	Voltage
	VDC 10-36				VAC 10-230
	K24	2K24	K14	K6	K14	K6
M1	X	‒	X	X	X	X
M2	X	‒	X	X	X	X
M3	‒	‒	‒	X	‒	‒
M4	‒	‒	‒	X	‒	‒
M1-T70F	‒	X	X	X	X	X
M2-T70F	‒	X	‒	X	‒	X
M3-T70F	‒	‒	‒	X	‒	‒
M1-TS	‒	X	‒	X	‒	‒
M2-TS	‒	X	‒	X	‒	‒
M3-TS	‒	‒	‒	X	‒	‒
M1-TA	‒	X	‒	X	‒	‒
M2-TA	‒	X	‒	X	‒	‒
M3-TA	‒	‒	‒	X	‒	‒
RTA	X	‒	‒	‒	‒	‒
D1	‒	X	‒	‒	‒	‒
D2	‒	X	‒	‒	‒	‒

Resistance

Hydraulic fluids
Mineral oils	Mineral oil	HLP	according to DIN 51524	Resistant
Flame-resistant hydraulic fluids	Emulsions	HFA-E	according to DIN 24320
	Water solutions	HFC	according to VDMA 24317
	Phosphoric acid esters	HFD-R
	Organic esters	HFD-U
Fast bio-degradable hydraulic fluids	Triglycerides (rape seed oil)	HETG	according to VDMA 24568
	Synthetic esters	HEES
	Polyglycols	HEPG

electrical

Plug-in connection	4-pole M12 x 1 (material: metal) (K24) 4-pole (3 + PE) DIN EN 175301-803 (K14) 7-pole (6 + PE) DIN EN 175201-804 (K6)

Reed contacts of the float switches
with connection K24, K14, K6/DC

Switching voltage range	V DC	10 … 36
Maximum switching current	A	0.5
Maximal contact load	VA	10

Temperature contacts of the float switches
with connection K24, K14, K6/DC

Switching voltage range	V DC	10 … 50
Maximum switching current	A	0.5
Maximal contact load	VA	10
Maximum switching cycles		100000
Response tolerance	K	± 3
Hysteresis	K	≤10
Maximum temperature change velocity	K/min	1

Reed contacts of the float switches
with connection K14 according to DIN EN 175301-803 / K6 according to DIN EN 175201-804/AC

Switching voltage range	V AC/DC	10 … 230
Maximum switching current	A	0.5
Maximal contact load	VA	10

Temperature contacts of the float switches
with connection K14 according to DIN EN 175301-803 / K6 according to DIN EN 175201-804/AC

Switching voltage range	V AC/DC	10 … 230
Maximum switching current	A	2.5
Maximal contact load	VA	100
Maximum switching cycles		100000
Response tolerance	K	± 3
Hysteresis	K	≤10
Maximum temperature change velocity	K/min	1

Temperature sensor Pt100

Sensor element		Pt100 class B DIN EN 60751
Temperature measuring range	°C	0 … 100
Accuracy	K	± 0.8

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

Outlet 1)	mA	4 … 20
Resolution resistance measuring chain	mm	5
Maximum load resistance		(U ‒ 9 V) / (0.02 A)
Temperature measuring range	°C	0 … 100

1)	Alternatively 0 … 20, 2 … 10 or 0 … 5 V adjustable

Display and control unit

Power supply		V DC	10 … 32
Display range		°C	-20 … +120
Alarm adjustment range	Temperature	°C	0 … 100
	Level	%	0 … 100
	Level	l	0 … 999
Switching points			4 programmable switching outputs (2 level + 2 temperature)
Housing design			PA, IP65 (antistatisch)
Current consumption upon switch-on	more than 100 ms	mA	≈ 100
Current consumption during operation	with UB 24 V	mA	≈50
Switching output			PNP
Switching output	Maximum switching power	A	0.5
Operation			3 keys

For applications outside these parameters, please consult us!

With two switching contacts

With two switching contacts and one temperature contact

With resistance measuring chain/resistance thermometer

With display and control unit, resistance measuring chain/resistance thermometer

Connection versions and pin assignment

By default, the switching point L1 is set as normally closed contact and switching points L2 to L4 as normally open contact. The switching points can be adjusted in the device.

Rotating the contacts by 180° changes the switching function; the normally closed contact type becomes a normally open contact or vice versa.

Pre-set switching points Type M

Float switch Ordering length "L"	Number of switching points
	Switching points pre-set
		1	2	3	4
mm		mm	mm	mm	mm
370	L1	220	220	220	280
	L2	-	140	140	220
	L3	-	-	60	140
	L4	-	-	-	60
500	L1	280	280	280	340
	L2	-	160	160	280
	L3	-	-	60	160
	L4	-	-	-	60
800	L1	600	600	600	700
	L2	-	400	400	600
	L3	-	-	200	400
	L4	-	-	-	200
1000	L1	700	700	700	800
	L2	-	500	500	700
	L3	-	-	200	500
	L4	-	-	-	200
1200	L1	800	800	800	1000
	L2	-	600	600	800
	L3	-	-	300	600
	L4	-	-	-	300

Dimensions:

Float switch with level and temperature contacts (version M - T..F)Float switch with resistance measuring chain and resistance thermometer (version RTA)

Dimensions in mm

1	Switching points
2	Flat seal
3	Stilling tube from L = 500 mm
4	Name plate
5	Installation opening of the tank
6	Mating connector for plug-in connections K24 (M12 x 1), see table "Mating connector"
7	Connector K24; 4-pole M12 x 1
8	Stroke limitation ring set to 20 mA (Type RTA)
Version M: L1 = min. 70 mm
Version RTA: L1 = L ‒ min. 57 mm

Dimensions: Float switch with display and control unit (version D..)

Dimensions in mm

1	Measuring range 4 … 20 mA
2	Flat seal
3	Stilling tube from L = 500 mm
4	Name plate
5	Installation opening of the tank
6	Mating connector for plug-in connections K24 (M12 x 1), see table "Mating connector"
7	Connector K24; 4-pole M12 x 1
8	Stroke limitation ring set to 20 mA (Type RTA)
9	LEDs for the display of alarm switching points

Oil volume specification for float switch

Type M with two switching contacts

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
370	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
500	280	160	1000	490	740
	280	160	1250	780	1030
	280	160	1600	990	1310
	280	160	2000	1380	1730

Attention!

Before the commissioning, the switching contacts are to be set according to the necessary operating conditions.

Adjustment of the switching height

The contacts installed in the float switch are screwed to a contact strip within the sliding tube. They are set to the switching points according to the preceding table and can be adjusted to higher or lower values retroactively (observe minimum distances!). For adjusting the contacts, proceed as follows:

Interrupt the voltage supply Loosen the plug-in connection Loosen the screws of the connector base and pull out the connector base with the contact strip Loosen the contact from the strip and fasten it at the desired position (it can be adjusted in steps of 10 mm) Carefully insert the contact strip Fasten the connector base by means of the screws Re-establish the plug-in connection and the power connection

Type RTA, D1 and D2

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

Assembly information

Vertical installation according to technical data (see "Technical Data") Avoid flows Do not expose the switch to strong impact and bends Avoid external magnetic fields. They may impair the function of the reed contacts.

Electrical connections:

Electrical connections may only be performed by specialists Before performing any works at electrical parts, the voltage supply is to be interrupted Tighten round connector M12 x 1 or mating connectors after connection Only plug in the round connector M12 x 1 or mating connector if it is de-energized Do not overload the contacts (see technical data) In case of inductive load, provide for a protective circuit!

Normative reference

AB 24-02

Cable sets and distributors

AB 40-40

Tank made of steel, form AN, cover form C, oil pan according to WHG

AB 40-43

Tank made of steel, cover form C

AB 40-44

Tank made of steel, with frame

R.08006

Mating connectors for controlling electric valves and sensors

DIN 24320

Flame-resistant fluids - Hydraulic fluids of categories HFAE and HFAS - Properties and requirements

DIN 51524

Hydraulic fluids; hydraulic oils

DIN EN 175201-804

Detail specification - Circular connectors - Round contacts, size diameter 1.6mm, threaded coupling; German version EN 175201-804:1999

DIN EN 175301-803

Detail specification: Rectangular connectors - Flat contacts, 0,8mm thickness, locking screw not detachable; German version EN 175301-803:1999

DIN EN 60751

Industrial platinum resistance thermometers and platinum temperature sensors (IEC 60751:2008)

DIN EN 60529

Protection classes by housing

VDMA 24317

Fluid technology – Flame-resistant fluids – Technical minimum requirements

VDMA 24568

Fluid technology – Fast bio-degradable fluids – Technical minimum requirements

VDMA 24574-1

Fluid technology – Terms, menu navigation and electrical connection for fluid sensors

Mating connectors

For detailed information see data sheet 08006
Mating connector for connector K14 according to DIN EN 175301-803		Mating connector for connector K6 according to DIN EN 175201-804

Denomination	Part number	Denomination	Part number
LEITUNGSDOSE 4P Z14 M SW SPEZ	R901017012	LEITUNGSDOSE 7P Z6 N6RFFK	R900002803

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