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Related Item: Duotect Series H2 Switches

Duotect Series H3 Explosion-proof Differential Pressure Switches

Setpoints from 10" w.c. to 200 psid, Rated 1500 psig, Weatherproof
 

Duotect H3Explosion-proof, heavy duty, industrial unit has patented and unique new design which provides sensitivity to differential pressures as low as 10 inches of water (254 mm w.c.), yet handles total pressure of 1500 psi (103 bar). Unit yields deadbands approximately 5% of range, with zero setpoint shift due to variation in working pressures. Friction is minimized and repeatability increased by allowing range spring to act directly on diaphragm plate. Rolling diaphragm design maintains constant effective area to further reduce friction. See H3 without cover Diaphragm is allowed to "seat", allowing application of full rated pressure, up to 1500 psi (103 bar), on either high or low pressure port, without damage. Special over-travel feature prevents overtightening of range adjust screw. Choose optional brass chamber for water and water-based fluids or 316 stainless steel for harsher applications. See Dimensions

 
SPECIFICATIONS
Wetted Materials: See pressure chamber and diaphragm material in model chart.
Temperature Limit: 220°F (105°C).
Pressure Limit: 1500 psig (103 bar).
Enclosure Rating: See ratings chart.
Switch Type: SPDT or DPDT snap switch.
Electrical Rating: 5A @ 125/250 VAC, 30 VDC.
Electrical Connections: see model chart.
Conduit Connection: 3/4" female NPT.
Process Connection: 1/8" female NPT.
Mounting Orientation: Vertical.
Set Point Adjustment: Internal screw.
Weight: 4 lb, 2 oz (2 kg).
Deadband: Approximately 5% of range.
Agency Approvals: UL and CSA see ratings chart. CE. ATEX pending.
 
Model Chart - Series H3
Example H3 S 2 S C MV H3S-2SC-MV Differential Pressure Control; 316SS pressure chamber and Viton® diaphragm, weatherproof and explosion-proof enclosure, SPDT snap action switch with gold contacts; fixed deadband; automatic reset; adjustable range 0.5-15 psid.
Construction H3 Series designator, weatherproof and explosion-proof
Pressure Chamber & Diaphragm Material (Wetted) A
S
Aluminum chamber with Nitrile diaphragm
316SS chamber with Viton® diaphragm
Adjustable Operating Range

(Deadband approx. 5% of range.)
1
2
3
4
Adjustable range 10-180" w.c. (2.48-44.78 kPa)
Adjustable range 0.5-15 psid (0.3-1 bar)
Adjustable range 5-70 psid (.34-4.8 bar)
Adjustable range 10-200 psid (.7-13.8 bar)


Max. pressure for all ranges is 1500 psi (103 bar.)
Circuit (Switch) Options S

D
SPDT snap action switch rated 5A @ 125/250VAC, 30 VDC
DPDT snap action switch rated 5A @ 125/250VAC, 30 VDC
Electrical Connection L
C
18 AWG x 18 inch lead wires
UL, CSA approved internal terminal block
Options CSA
DRAIN


MV


VIT
CSA approved construction
Housing with drain - allows condensate to be drained from inside enclosure (meets NEMA 3 instead of 4X)
Gold contacts on snap switch for dry circuits rated 1A @ 125VAC, 1A resistive or 0.5A inductive @ 30VDC
Viton® diaphragm option where not standard
 
Popular SPDT Contacts Models
Model
Number
Pressure Chamber Diaphragm Material (Wetted) Adjustable Operating Range Circuit (Switch) Options
 H3A-1SL  Aluminum  Nitrile  10-180 in. w.c. (2.48-44.78 kPa)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3A-2SL  Aluminum  Nitrile  0.5-15 psid (0.3-1 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3A-3SL  Aluminum  Nitrile  5-70 psid (.34-4.8 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3A-4SL  Aluminum  Nitrile  10-200 psid (.7-13.8 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3B-1SL  Brass  Nitrile  10-180 in. w.c. (2.48-44.78 kPa)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3B-2SL  Brass  Nitrile  0.5-15 psid (0.3-1 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3B-3SL  Brass  Nitrile  5-70 psid (.34-4.8 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3B-4SL  Brass  Nitrile  10-200 psid (.7-13.8 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-1SL  316 SS  Viton  10-180 in. w.c. (2.48-44.78 kPa)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-2SL  316 SS  Viton  0.5-15 psid (0.3-1 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-3SL  316 SS  Viton  5-70 psid (.34-4.8 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-4SL  316 SS  Viton  10-200 psid (.7-13.8 bar)  SPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 
Popular DPDT Contacts Models
Model
Number
Pressure Chamber Diaphragm Material (Wetted) Adjustable Operating Range Circuit (Switch) Options
 H3A-1DL  Aluminum  Nitrile  10-180 in. w.c. (2.48-44.78 kPa)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3A-2DL  Aluminum  Nitrile  0.5-15 psid (0.3-1 bar)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3A-3DL  Aluminum  Nitrile  5-70 psid (.34-4.8 bar)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3A-4DL  Aluminum  Nitrile  10-200 psid (.7-13.8 bar)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-1DL  316 SS  Viton  10-180 in. w.c. (2.48-44.78 kPa)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-2DL  316 SS  Viton  0.5-15 psid (0.3-1 bar)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-3DL  316 SS  Viton  5-70 psid (.34-4.8 bar)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 H3S-4DL  316 SS  Viton  10-200 psid (.7-13.8 bar)  DPDT snap action switch rated 5A @ 125/250 VAC, 30 VDC
 
 
 
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