Technical Parameters Category Parameter Specification / Description General Model MR98H Type High-Thrust, Multi-Spring Pneumatic Positioner Input & Output Input Signal 3 to 15 psi (0.2 to 1.0 bar) Supply Pressure Up to 150 psig (10.3 bar) Output Action Double-Acting (Standard) Performance Output Capacity Extremely High. Specifically designed to supply and exhaust the large air volumes required by piston actuators. Significantly higher than standard positioners like the 3610J. Linearity ±1% of span Hysteresis Less than 0.5% of span Air Consumption Steady State: ~0.2 SCFM (5.7 NLPM) During Stroking: Very high, capable of flows over 10 SCFM. Environmental Ambient Temperature -40°F to 180°F (-40°C to 82°C) Enclosure Rating Type 4X, 7, 9 (NEMA 4X, 7, 9); Weatherproof, dust-tight, and certified for hazardous locations. Hazardous Area Certifications FM/CSA: Explosion-proof (Class I, Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G). Physical Housing Material Cast Aluminum with corrosion-resistant coating. Pneumatic Connections Supply & Outputs: 1/2" NPT (to accommodate high flow) Mounting Typically mounts directly onto Fisher 98L and other large piston actuators.
