Electronic

pressure measurement

WIKA data sheet PE 81.21

Page 1 of 7

Pressure transmitter with thin lm technology

For mobile hydraulic applications

Model MH-1

Description

Robust design

Extreme shock and vibration resistance, resistance to pressure

spikes (CDS system) and ingress protection greater than

IP68 make the model MH-1 pressure transmitter especially

qualied for the harsh operating conditions in mobile hydraulics.

Measuring ranges from 0 ... 60 to 0 ... 600 bar cover the

standard applications in mobile hydraulics completely.

Proven thin-lm sensor technology

The hermetically welded thin-lm measuring cell ensures a

high long-term leak tightness. The need for additional sealing

materials is dispensed with completely.

The thin-lm sensor is especially impressive in applications

with high dynamic loads. The thin-lm sensor of the MH-1 is

made from stainless steel and is manufactured using sputtering

technology which ensures a high long-term stability.

A special protection to prevent the escape of oil following

damage is oered by the recessing of the security sensor within

the process connection.

The design matched to mobile applications enables shock

loading up to 100 g and vibration up to 20 g.

Very good EMC characteristics in accordance with EN 61326

ensure reliable operation even under severe EMC conditions. In

addition, there is protection against load dump of up to 200 V.

High ingress protection

Even extreme temperature shocks do not aect the operational

safety. Especially for mobile applications, these pressure

transmitters oer a wide range of available ingress protections.

As well as the M12 x 1 circular connector with a screw-on lid, an

angular connector per DIN EN 175301-803, form C with IP65 is

also available.

For extreme applications, cable versions up to IP69K (steam

jet-proof) with pre-assembled, customer-specic connectors

are available.

Pressure transmitter, model MH-1

Applications

■

Mobile hydraulics

■

Machine building

■

General industrial applications

Special features

■

Measuring ranges from 0 ... 60 to 0 ... 600 bar

■

Output signals 4 ... 20 mA and DC 1 ... 5 V

■

Extremely shock and vibration resistant

■

Ingress protection IP65 to IP69K (steam jet-proof)

WIKA data sheet PE 81.21

∙ 08/2017

Page 2 of 7 WIKA data sheet PE 81.21 ∙ 08/2017

Measuring ranges

Gauge pressure

bar 0 ... 60 0 ... 100 0 ... 160 0 ... 250 0 ... 400 0 ... 600

psi 0 ... 1,000 0 ... 1,500 0 ... 2,000 0 ... 3,000 0 ... 5,000 0 ... 8,000

Other measuring ranges on request.

Overload safety: 2 times

Vacuum tightness: Yes

Output signals

Signal type Signal

Current (2-wire) 4 ... 20 mA

Voltage (3-wire) DC 1 ... 5 V

Other output signals on request.

Load

■

Current (2-wire): ≤ (power supply - 10 V) / 0.02 A

■

Voltage (3-wire): > 5 kΩ

Voltage supply

Power supply

■

Current (2-wire): DC 10 ... 30 V

■

Voltage (3-wire): DC 10 ... 30 V

Time response

Settling time: ≤ 5 ms

Reference conditions (per IEC 61298-1)

Temperature: 15 ... 25 °C (59 ... 77 °F)

Atmospheric pressure: 860 ... 1,060 mbar (12.5 ... 15.4 psi)

Humidity: 45 ... 75 % r. h.

Power supply: DC 24 V

Mounting position: Calibrated in vertical mounting position with process connection facing downwards.

Accuracy specications

■

Non-linearity (per IEC 61298-2): ≤ ±0.4 % of span BFSL

■

Accuracy ≤ 0.5 % of span BFSL

■

Long-term stability (per DIN 16086:2006-01): ≤ 0.2 % of span/year

1) Including non-linearity, hysteresis, zero oset and end value deviation (corresponds to measured error per IEC 61298-2).

WIKA data sheet PE 81.21 ∙ 08/2017 Page 3 of 7

Operating conditions

Permissible temperature ranges

■

Medium: -40 ... +125 °C (-40 ... +257 °F)

■

Ambient: -30 ... +85 °C (-22 ... +185 °F), option: -40 ... +85 °C (-40 ... +185 °F)

Depending on the choice of sealing on the process connection, the electrical connection or cULus approval, the medium and

ambient temperatures may be limited (for restrictions see “Process connections,

sealings” and “Electrical connection”).

Storage and transport conditions

Storage temperature: -40 ... +85 °C

Climate classes

■

Storage: 1K4 (per EN 60721-3-1)

■

Transport: 2K3 (per EN 60721-3-2)

■

Operation: 4K4H (per EN 60721-3-4, without condensation or icing)

Vibration resistance: 20 g (IEC 60068-2-6)

Shock resistance: 500 g (IEC 60068-2-27)

Process connections

Standard Thread size

DIN 3852-E G ¼ A

M14 x 1.5

ANSI/ASME B 12.5 ¼ NPT

Others on request.

Page 4 of 7 WIKA data sheet PE 81.21 ∙ 08/2017

Electrical connections

Description Ingress protection

Circular connector M12 x 1, 4-pin IP67

Angular connector DIN 175301-803 C

■

Wire cross-section max. 0.75 mm

■

Cable diameter 4.5 ... 6 mm

IP65

Cable outlet (1.5 m, 3 m, 5 m)

■

Wire cross-section 3 x 0.75 mm² / AWG 20 with end splices

■

Cable diameter 5.9 mm (2-wire), 8.4 mm (3-wire)

IP69K

Other connections on request.

Connection diagrams

Circular connector M12 x 1 (4-pin)

2-wire 3-wire

U+ 1 1

U- 3 3

S+ - 4

Angular connector DIN 175301-803 C

2-wire 3-wire

U+ 1 1

U- 2 2

S+ - 3

Cable outlet

2-wire 3-wire

U+ brown black

U- red black

S+ - black

Electrical protective measures

■

Short-circuit resistance: S+ vs. U-

■

Reverse polarity protection: U+ vs. U-

■

Insulation voltage: DC 500 V

Materials

Wetted parts

Stainless steel

WIKA data sheet PE 81.21 ∙ 08/2017 Page 5 of 7

Approvals

Logo Description Country

EU declaration of conformity

■

EMC directive

■

Pressure equipment directive

■

RoHS directive

European Union

EAC

■

EMC directive

■

Pressure equipment directive

Eurasian Economic Community

GOST