Electronic Pressure Measurement Special Purpose Pressure Transmitters for Mobile Hydraulic Applications Type MH-2 WIKA Datasheet MH-2 Applications Mobile hydraulic systems Load Monitoring Special Features Pressure ranges from 100 psi to 8,000 psi 4-20 mA, 1-5V, 0-10V, 0.5-4.5V ratiometric outputs available Durable thin film sensor technology CDS system for protection from pressure spikes and cavitation IP 69K high pressure steam wash-down protection available MH-2 pressure transmitters MTTF values > 100 years Description MH-2 pressure transmitters are precision engineered for off A metal sleeve inside the case provides excellent EMI road and mobile hydraulic applications where performance protection to 100v/m. Several NEMA 4 / IP 67 electrical and durability are critical. Extreme shock and vibration connections are available. The cable version provides resistance, available high pressure steam wash-down environmental protection to IP 69K for resistance to protection and the WIKA CDS system (cavitation dampening high-pressure steam wash-down cleaning procedures. system) provide one of the most rugged pressure transmitters available today. Pressure ranges from 1,000 psi to 8,000 psi The MH-2 is specifically designed for OEM applications meet all standard mobile hydraulic pressure applications. in the mobile hydraulics and automotive industry. It is manufactured on a fully automated production line to The all-welded thin film measuring cell eliminates the need provide large quantities of transmitters with consistent for additional soft sealing materials that may deteriorate over quality and highly competitive pricing. time. The thin film sensor uses sputtered technology that provides excellent long-term stability in applications producing Custom modifications are available for large quantity frequent pressure cycles. The rugged glass reinforced PBT requirements. plastic case has been used in under hood automotive applica- tions for many years. WIKA Datasheet MH-2 4/2012 Page 1 of 4 RSpecifications Type MH-2 Pressure range -30 InHG/100 psi -30 InHG/100 psi 100 psi 150 psi 250 psi 300 psi 500 psi Maximum pressure* 1,740 psi 2,900 psi 290 psi 464 psi 725 psi 725 psi 1,160 psi Burst pressure** 7,970 psi 11,600 psi 1,450 psi 2,320 psi 3,625 psi 3,625 psi 5,800 psi Pressure range 1,000 psi 1,500 psi 2,000 psi 3,000 psi 5,000 psi 17,500 psi 8,000 psi Maximum pressure* 1,740 psi 2,900 psi 4,600 psi 7,200 psi 11,600 psi 17,400 psi 17,400 psi Burst pressure** 7,970 psi 11,600 psi 14,500 psi 17,400 psi 26,500 psi 34,800 psi 34,800 psi *Pressure applied up to the maximum rating will cause no permanent change in specifications but may lead to zero and span shifts **Exceeding the burst pressure may result in destruction of the transmitter and possible loss of media Materials: Stainless steel Wetted parts Fiberglass-reinforced polybutylene terephthalate (PBT) Case Power supply U Signal output Power supply U Maximum load R B B A Signal output and 4 ... 20 mA, 2-wire 10 ... 36 DC V R <(U 10 V) / 0.02 A with A B Maximum load R R in Ohm and U in Volt A A B 1 ... 5 V, 3-wire 8 ... 36 DC V R > 2.5 kOhm A 0 ... 10 V, 3-wire 14 ... 36 DC V R > 5 kOhm A 0.5 ... 4.5 V, ratiometric 5 + 0.5 DC V R > 4.5 kOhm A Others on request Response time (10 ... 90 %) ms < 2 Isolation voltage VDC 500 Accuracy % of span < 0.5 (BFSL) % of span < 1.0 (limit point calibration) (Includes non-linearity, hysteresis, zero point and full scale error per IEC 61298-2) Non-repeatability % of span < 0.2 Non-linearity % of span < 0.4 (BFSL) according to IEC 61298-2 1-year stability % of span < 0.3 (at reference conditions) Permissible temperature of: ) -40 ... +257 F -40 ... +125 C Media * ) -40 ... +212 F -40 ... +100 C Ambient * ) -40 ... +248 F -40 ... +120 C Storage * ) * Also complies with EN 50178, Tab. 7, Operation (C) 4K4H, Storage (D) 1K4, Transpor t (E) 2K3 Compensated temperature range +32 ... +176 F 0 ... + 80 C Temperature coefficients (TC) within compensated temperature range: % of span < 0.15 / 10K (special pressure ranges may have increased zero TC) Mean TC of zero Mean TC of range % of span < 0.15 / 10K From -40+257 F (-40+125 C) Typ +/- 2.0%, max +/- 3.5% Total error band (TEB) % of span (over operating range) CE conformity 2004/108/EC interference emission and immunity see EN 61 326 interference emission limit class A and B 97/23/EG Pressure equipment directive Shock resistance g 500 according to IEC 60068-2-27 (mechanical shock) Vibration resistance g 20 according to IEC 60068-2-6 (vibration under resonance) Short circuit protection S+ towards U- Reverse polarity protection S+ towards U- available with ratiometric signal upon request Weight oz Approximately 2.1 Page 2 of 4 WIKA Datasheet MH-2 4/2012