
United Electric Controls H121K Series; NEMA 4X, 7 & 9 Differential Pressure Switch; Class I Divisions 1& 2 Groups B, C and D; Class II Divisions 1 & 2 Groups E, F and G; Class III; One SPDT Output; Epoxy Coated Enclosure; External Adjustment with Reference Dial  




1/4"NPT Aluminum Pressure Connection; BunaN Diaphragm; 2 to 20 psid Adjustable Set Point Range; 0.1 to 0.3 psi Fixed Deadband; 225 psi Proof Pressure; 30"Hg Vacuum to 225 psi Working Pressure 


1/4"NPT Aluminum Pressure Connection; BunaN Diaphragm; 3 to 30 psid Adjustable Set Point Range; 0.1 to 0.4 psi Fixed Deadband; 225 psi Proof Pressure; 30"Hg Vacuum to 225 psi Working Pressure 


1/4"NPT Aluminum Pressure Connection; Teflon & BunaN Diaphragms; 0 to 100 psid Adjustable Set Point Range; 0.2 to 1 psi Fixed Deadband; 225 psi Proof Pressure; 30"Hg Vacuum to 225 psi Working Pressure 


1/4"NPT Nickel Plated Brass Pressure Connection; Brass Bellows; 3 to 30 psid Adjustable Set Point Range; 0.3 to 1.5 psi Fixed Deadband; 180 psi Proof Pressure; 30"Hg Vacuum to 100 psi Working Pressure 


1/4"NPT Nickel Plated Brass Pressure Connection; Brass Bellows; 10 to 100 psid Adjustable Set Point Range; 0.5 to 2 psi Fixed Deadband; 180 psi Proof Pressure; 30"Hg Vacuum to 150 psi Working Pressure 


1/2"NPT 316L Pressure Connection; 316L Bellows; 3 to 30 psid Adjustable Set Point Range; 0.3 to 2 psi Fixed Deadband; 300 psi Proof Pressure; 30"Hg Vacuum to 100 psi Working Pressure 


1/2"NPT 316L Pressure Connection; 316L Bellows; 10 to 100 psid Adjustable Set Point Range; 0.5 to 3 psi Fixed Deadband; 300 psi Proof Pressure; 30"Hg Vacuum to 180 psi Working Pressure 

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