The photohelic switch/gauges function in the same manner, as versatile, etc..
The photohelic
switch/gauges function in the same manner, as versatile, precise
pressure switches combined with a pressure gauge utilizing the time
proven magnehelic design. Available with 1 or 2 LED/phototransistor
actuated relays. Gauge reading is unaffected by switch operation. Easy
to adjust set points with knob controls. Apply pressure and switch set
points are fully visible. Deadband is 1 pointer width—less than 1%
full scale. DPDT relays can easily be interlocked to provide variable
deadband control. For positive, negative or differential pressures as
low as 0.25" water column to 0 to 300 psi full scale; set points as
low as .01 w.c. on .25" scale unit.
SPECIFICATIONS
Ambient Pressure
Range
20°F to 120°F.
Low temperature models available as an option
Related Pressure
Photohelic
20" Hg to 25
psig total pressure on either side of diaphragm. MP Model to 35 psig and
HP Model to 80 psig also available. Capsuhelic, 20 Hg to 500 psig
Accuracy
Photohelic, ±2% of
full scale at 70° (3% on "O" models, 4% on "OO"
models. Capsuhelic, ±3% of full scale at 70° (2% on 4300 S models, 4%
on 43215, 43220, 43500)
Gauge Connection
Photohelic,
1/8" NPT. Capsuhelic, 1/4" NPT
Electrical Ratings
10 amps at 70 VAC,
60 Hz resistive
(Of relays)
6 amps at 240 VAC
Power Required
120 VAC, 50/60 Hz
Conduit Opening
3/4" conduit
CAT
NO.
MODEL
DEscRIPTION
AVAIL
PRICE
DW33931
3000-00
DWYER
PRESSURE SWITCH/GAUGE, 0 to .25" H2O .005 Divisions
