| EXAMPLE |
DPA |
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_ _33 |
_153 |
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61 |
DPA-33-153-61- Differential Pressure Control, brass bellows, adjustable deadband, automatic reset, SPDT mercury switch, adjustable range 0-10 psid (0-0.7), operating range 30" Hg vac - 50 psig (75 cm Hg vac - 3.5) |
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| CONSTRUCTION |
DP_ |
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General purpose enclosure, NEMA -1 (standard) |
CSA |
RESET
OPTIONS |
A |
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Automatic reset, adjustable deadband, double adjustment |
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R |
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U |
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Manual reset, single adjustment, operates on decrease automatically |
CSA |
R |
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L |
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Manual reset, single adjustment, operates on increase automatically |
CSA |
S |
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Automatic reset, fixed deadband, single adjustment |
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HOUSING
OPTIONS |
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W |
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Weatherproof enclosure, NEMA-3R, 4, 4X |
CSA |
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E |
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Explosion-proof enclosure, NEMA-7, 9, Class I, Groups C & D, Class II, Groups E, F & G |
CSA |
CIRCUIT
(SWITCHING)
OPTIONS
For electrical code see chart below. |
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2 |
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SPST mercury switch, elect. code A, opens on differential pressure increase |
CSA |
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3 |
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SPST mercury switch, elect. code A, closes on differential pressure increase |
CSA |
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153 |
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SPDT mercury switch, elect. code B |
CSA |
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156 |
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SPDT, 2 each SPST mercury switches, 1 each opens on differential pressure increase, 1 each closes on differential pressure increase, elect. code A |
CSA |
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804 |
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DPDT, 2 each SPDT mercury switches, elect. code B |
CSA |
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( ) |
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Other circuits available, consult factory |
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S |
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2_ _ |
2 |
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SPST magnetic mercury switch, elect. code I, opens on differential pressure increase, fixed deadband |
CSA |
S |
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2_ _ |
3 |
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SPST magnetic mercury switch, elect. code I, closes on differential pressure increase, fixed deadband |
CSA |
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4_ _ |
4122 |
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2 stage, 2 each SPST magnetic mercury switches, 1 each opens on differential pressure increase, 1 each opens on further increase, elect. rating per note †† below |
CSA |
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4_ _ |
4132 |
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2 stage, 2 each SPST magnetic mercury switches, 1 each closes on differential pressure increase, 1 each closes on decrease, both open mid range, elect. rating per note †† below |
CSA |
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4_ _ |
4129 |
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2 stage, 2 each SPST magnetic mercury switches, 1 each closes on differential pressure increase, 1 each closes on further increase, elect. rating per note †† below |
CSA |
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4_ _ |
4123 |
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2 stage, 2 each SPST magnetic mercury switches, 1 each opens on differential pressure increase, 1 each opens on decrease, both close mid range, elect. rating per note †† below |
CSA |
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5_ _ |
2 |
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SPST magnetic mercury switch, elect. code H, opens on differential pressure increase, narrow adjustable deadband |
CSA |
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5_ _ |
3 |
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SPST magnetic mercury switch, elect. code H, closes on differential pressure increase, narrow adjustable deadband |
CSA |
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70_ _ |
153 |
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SPDT snap acting switch, elect. code D, adjustable deadband |
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70_ _ |
804 |
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DPDT, 2 each SPDT snap acting switches, consult factory |
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S |
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72_ _ |
153 |
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SPDT snap acting switch, fixed deadband, elect. code E per note ‡‡ below |
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S |
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72_ _ |
804 |
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DPDT, 2 SPDT snap acting switches, fixed deadband, elect. code G per note ‡‡ below |
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74_ _ |
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2 stage, 2 each SPDT snap acting switches, elect. code G per note ‡‡ below |
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| OPTION |
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B |
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Delrin bushed movement |
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| BELLOWS MATERIALS |
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_ _33 |
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Brass bellows, ranges 61, 62, 64 only |
CSA |
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_ _43 |
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Type 316 stainless steel bellows, ranges 62E, 64E, 65E only |
CSA |
ADJUSTABLE
DIFFERENTIAL
PRESSURE
RANGES
OPERATING
PRESSURE
RANGES |
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61 |
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Adjustable range 0-10 psid, operating range 30" Hg vac - 50 psig, (75 cm Hg vac - 3.5) |
CSA |
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62 |
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Adjustable range 0-20 psid, operating range 30" Hg vac - 100 psig, (75 cm Hg vac - 7.0) |
CSA |
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64 |
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Adjustable range 0-30 psid, operating range 30" Hg vac - 300 psig, (75 cm Hg vac - 21) |
CSA |
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62E |
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Adjustable range 0-20 psid, operating range 30" Hg vac - 100 psig, (75 cm Hg vac - 7.0) |
CSA |
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64E |
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Adjustable range 0-30 psid, operating range 30" Hg vac - 300 psig, (75 cm Hg vac - 21) |
CSA |
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65E |
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Adjustable range 0-80 psid, operating range 30" Hg vac - 600 psig, (75 cm Hg vac - 42) |
CSA |
