3000SGT Photohelic Press Switch/Gage w/ Integral Transmitter
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Indicating
gage, Low and High limit control, 4-20 mA transmitter. |
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The Series 3000SGT Photohelic® Switch/Gage/Transmitter combines
several critical control functions into a single, easy-to-install
package. This versatile instrument starts with the universally accepted standard for reliable low air pressure measurement,
the Dwyer Magnehelic® Gage. It measures positive, negative
or differential pressures within ±2% of full scale
accuracy. This time-proven component provides highly reliable
analog indication of air or compatible gas pressure on a
4", 80° scale. Gage operation is completely independent — functions
normally even if power is interrupted to electrical elements
of the control. Dimensional Information
Next, two DPDT relays are added which serve
as Low/High limit controls (or pressure switches) capable
of handling up to 10 amps @ 28 VDC or 120/240 VAC directly.
Individual setpoint deadband is one pointer width — less
than 1% of full scale; just enough to assure positive, chatter-free
operation. Integral holding coils enable user to connect
the two so they work like a single control with variable
deadband — ideal for applications such as clean room
and building pressurization, HVAC systems, automatic air
filter or level control and much more. Actuation points are
fully adjustable over the entire pressure range with convenient
front mounted knobs linked to bright red setpoint indicators.
Finally, the Photohelic® SGT includes
a separate 4-20 mA, 2-wire transmitter operating from an
external 10-35 VDC power supply. Separate adjustments are
included for zero and span inside the rear electronics enclosure.
Optional A-700 Power Supply is a perfect companion rated
for AC inputs from 100-240V; DC outputs from 24-28V. The
transmitter component is an ideal driver for variable speed
blowers and fans, damper positioners and for continuous data
logging on computerized VAV systems or strip chart recorders.
Besides the obvious cost and space saving
advantages of combining all these control functions in a
single unit, think of the additional savings in time and
material with just one set of pneumatic lines to connect
instead of three or four.
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PHYSICAL
DATA - GAGE SPECIFICATIONS |
- Service: Air and non-combustible, compatible gases.
- Wetted Materials: Consult factory.
- Accuracy: See model chart on "Ordering" page.
- Pressure Limits: See model chart on "Ordering" page.
- Temperature Limits: 20 to 120°F (-6.67 to
48.9°C).
- Process Connections: 1/8" female NPT.
- Size: 4" (101.6 mm) dial face, 5" (127 mm) O.D.
x 8-1/4" (209.55 mm).
- Weight: 3 lb 14.5 oz (1.77 kg).
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PHYSICAL DATA - SWITCH SPECIFICATIONS |
- Switch Type: Each set point has 2 Form C relays (DPDT).
- Repeatability: ±1% of full scale.
- Electrical Rating: 10A @ 24 VDC or 120 VAC, 6A @ 240 VAC.
- Electrical Connections: Screw terminals.
- Power Requirements: 120 VAC, ±10%.
- Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.
- Set Point Adjustment: Adjustable knobs on face.
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PHYSICAL DATA - TRANSMITTER SPECIFICATIONS |
- Accuracy: See model chart on "Ordering" page.
- Temperature Limits: 20 to 120°F (-6.67 to 48.9°C).
- Pressure Limits: See model chart on "Ordering" page.
- Thermal Effects: ±0.025% F.S./°F (0.045%
F.S./°C).
- Power Requirements: 10.0 to 35 VDC (2-wire).
- Output Signal: 4-20 mA DC.
- Zero & Span Adjustments: Multi-turn potentiometers,
internally accessible.
- Response Time: 250 mSec.
- Loop Resistance: 0-1250 ohms.
- Current Consumption: 38 mA DC, maximum.
- Electrical Connections: Terminal block.
- Warm-up Time: 10 minutes.
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OPTIONS AND ACCESSORIES |
Tamper-Proof Knobs: Require special spanner-type key (included)
to adjust set points. Add suffix -TAMP
A-700 Power Supply: AC input: 100/120/220/230-240 VAC ±10%,
47-63Hz. DC output: 24-28 VDC regulated |
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Stocked Models: |
Model
Numbers
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Range
in W.C.
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Maximum Pressure
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Electrical Accuracy +/- %
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Mechanical Accuracy +/- %
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3000SGT-0
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0
- 0.5
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25 psi
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2
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3
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3001SGT
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0
- 1.0
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25 psi
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2
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2
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3002SGT
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0
- 2.0
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10 in w.c.
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0.5
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2
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3003SGT
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0
- 3.0
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5 psi
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0.5
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2
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3006SGT
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0
- 6.0
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5 psi
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0.5
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2
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3010SGT
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0
- 10
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5 psi
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0.5
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2
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3020SGT
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0
- 20
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10 psi
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0.5
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2
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3030SGT
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0
- 30
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10 psi
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0.5
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2
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Model
Numbers
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Range
in Pascals
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Maximum Pressure
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Electrical Accuracy +/- %
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Mechanical Accuracy +/- %
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3000SGT
- 250Pa
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0
- 250
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25 psi
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2
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2
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3000SGT
- 500Pa
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0
- 500
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10 in w.c.
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0.5
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2
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Model
Numbers
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Range
in Kilopascals
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Maximum Pressure
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Electrical Accuracy +/- %
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Mechanical Accuracy +/- %
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3000SGT
- 1.5kPa
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0
- 1.5
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5 psi
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0.5
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2
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SUGGESTED SPECIFICATIONS
Differential pressure switches shall incorporated gages and
switch setpoint indicators for continuous indication of applied
pressure and switch settings. An integral 4-20 mA pressure transmitter
shall be included, calibrated for the range of the pressure
gage. Separate zero and span potentiometers shall be provided.
Units shall be diaphragm operated with switching accomplished
by phototransistor controlled DPDT relays. Setpoint adjustment
shall be controlled by knobs on front of unit. Switch/Gage/Transmitter
shall be Dwyer Instruments, Inc., Photohelic® Catalog Number.___
reading to ___ (in. w.c.)(Pa)(kPa) in ___ minor divisions. |
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