Uses    
PMM compact pressure switch is used to monitor pressure in liquid and gas systems. When pressure reaches the set level, the electrical contact status switches. For a normally open (NO) PMM, PMM closes the circuit closing as pressure rises and reaches the set point. While for a normally closed (NC) pressure switch, the circuit is activated when pressure falls below the set value.

Features      
● Compact size and high pressure resistance
● User-adjustable set pressure
● Long service life and high stability
● Low-pressure models use diaphragm as the pressure-sensing element (switch pressure: 0.3~50 bar)
● High-pressure models use piston as the pressure-sensing element (switch pressure: 40~250 bar)

Technical Data
● Maximum switching frequency at 25℃: 200 cycles/min (diaphragm); 80 cycles/min (piston)
● Pressure rating (see "Ordering Information"): Diaphragm: 160 bar (liquid); Piston: 300 bar (see ordering guide)
● Differential pressure at 25℃ (% of set value): 6~12% (diaphragm type), 8~18% (piston type)
● Max. voltage: 48VAC/48VDC
● Max. current: 0.5A (AC), 0.2A (DC)
● Working temperature: -20℃~+120℃
● Contact holder & cap material: Glass Fiber Reinforced Nylon 66
● Diaphragm material: HNBR, FPM, EPDM
● Electrical contact material: silver-plated copper
● Casing & piston material: 304/316L stainless steel
● Set pressure range: 0.3~250bar 
● Repeatability at 25℃: ±4% of range
● Protection class: IP65