Bosch Rexroth HM20 Hydraulic Pressure Sensor

Bosch Rexroth HM20 Hydraulic Pressure Sensor

Product basic information

Product model: HM20 (a product under Bosch Rexroth, document number RE 30272, February 2022 edition, replacing April 2018 edition)

Core application: Used for pressure measurement in hydraulic systems. All models with current output have obtained DNV marine certification and are suitable for marine scenarios (requiring additional surge protection)

Key certifications: CE, cUL US Listed, DNV, RoHS, compliant with EMC Directive and UK EMC Regulations (UKCA certification)

Core Features

Measurement capability: Provides 8 measurement ranges (10 bar, 50 bar, 100 bar, 160 bar, 250 bar, 315 bar, 400 bar, 630 bar), using thin film measurement units, with excellent accuracy performance - characteristic curve deviation<0.5% (including nonlinearity, hysteresis, zero and endpoint deviation), non repeatability<± 0.05% (within the reference temperature range)

Material and safety: The medium contact parts are made of stainless steel (1.4542/17-4 PH/630, etc.), and the shell material includes V4A (1.4404), PEI, HNBR; Equipped with high explosive pressure, reverse polarity protection, overvoltage protection, and short circuit protection, the pressure channel is equipped with a 0.3mm throttling element, which can reduce the risk of damage caused by dynamic effects such as pressure peaks and air pockets

Environmental adaptability: Environmental temperature range -40~+85 ° C, medium temperature range -40~+90 ° C, storage temperature range -40~+80 ° C; anti vibration (10-2000Hz/maximum 10g/3-axis), anti noise (20-2000Hz/14g RMS/24h/3-axis), anti transportation impact (15g/11ms/3-axis), protection level IP65/IP67 (requires correct installation of matching connectors)

Technical parameters

（1） General parameters

Category parameter values

Weight 0.06kg

Rated temperature range -25~+80 ° C

Pressure interface G1/4 thread (compliant with DIN 3852 E-type, requiring thorough venting)

Suitable for media HL, HLP, HFC, nitrogen (up to 300 bar), other media can be customized as needed

Tightening torque: 20-25Nm for hydraulic interface<400bar; 25-30Nm for ≥ 400bar; 0.6-1.5Nm recommended for connectors not specified

Life cycle of 60 million load cycles or 60000 hours (CE certified)

（2） Electrical parameters

Category parameter values

The rated power supply voltage is 24VDC, with a lower limit of 18VDC and an upper limit of 36VDC (maximum 30VDC under cULus certification), and the maximum allowable residual ripple is 2.5VSS (40-400Hz)

Current consumption voltage output ≤ 12mA

Protection level III

Insulation resistance>100M Ω (500VDC)

Output signal current output (4-20mA, load resistance R ₐ=(U ₛ -8.5V)/0.0215A); Voltage output (0.1-10V, load resistance R ₐ>2k Ω)

Response speed establishment time (10% -90%)<1ms

Temperature coefficient within the rated temperature range<0.1%/10K; outside the range<0.2%/10K

Long term drift (1 year, baseline conditions)<± 0.1%

（3） EMC compatibility

Immunity: Complies with EN 61000-4 series standards (ESD 4kV CD/8kV AD, surge 1kV, RF radiation 10V/m, etc.)

Emission limit: Complies with EN 55016-2 series standards (interference voltage 0.15-30MHz Class B, radiation field strength 30-1000MHz Class B)

Order code and accessories

（1） Order Code Rules (Example: HM20-2X/- K35-N)

Code bit meaning optional values

Product Type HM20 (Pressure Sensor)

02 Component Series 2X (20-29 Series, with unchanged installation dimensions and pin assignments)

03 Measurement range: 10/50/100/160/250/315/400/630 (corresponding to bar number)

04 Output Type C (4-20mA current output, with DNV certification), H (0.1-10V voltage output)

05 connector K35 (4-pin M12x1)

06 Throttle element N (0.3mm nozzle type)

（2） Optional accessories (need to be ordered separately)

Cable set: 4-pin M12x1 interface, including straight 2m (R900773031), straight 5m (R900779498), bent 2m (R900779504), and bent 5m (R900779503), corresponding to data sheet 08006

Matching connector: 4-pin M12x1 interface, straight PG7 (R900773042), curved PG7 (R900779509)

Replacement seal: NBR material sealing ring (R900012467)