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PDD - Digital Pressure Switch
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| PDD - Digital Pressure Switch |
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BENEFITS AND FEATURES
- Ranges 0-30” Hg Vacuum to 0-5800 PSIG
- Fully Programmable with Setpoint, Reset Point and Window Capability
- Accuracy ±0.5% of Full Scale
- Large Easy to Read LED Display
- Ceramic Pressure Sensing System for High Cycle Life
Specifications:
- Switching range: 0-30" Hg Vacuum to 0-5800 PSIG
- Fitting: 1/4" NPT, 1/2" NPT, 304 SS
- Housing: 304 SS
- Max. temperature:176 °F (media)
- Semiconductor PNP/NPN, digital display, programmable
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General Description
The PDD series digital pressure switch
integrates the latest solid state sensing
technology into a very versatile, simple to
operate package. Programming features
include setpoint, reset point, window
mode, pulsation dampening, switch logic,
zero (tare) adjustment and user settable
lockout code. The ceramic sensing
system and solid state transistor switch
ensure an exceptionally long cycle life with
virtually no calibration drift. These features
along with the compact, robust stainless
steel package make the PDD an ideal
choice for OEM applications.
Specifications
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Measuring Ranges: 0-30” Hg vacuum
to 0-5800 PSIG
Display Type: 3 digit LED
Switch Status
Indicator: Single red LED, on
when pressure is
above setpoint
Accuracy: ±0.5% of full scale
Sensor Element: Piezo-resistive
ceramic
Operating Temp. Range
Process Medium: -4 to 176°F
Ambient: -4 to 140°F
Overpressure Ratings:
-30” Hg to
1450 PSIG: 2x Max. range
>1450 PSIG: 1.2x Max. range
Process Wetted Parts
Sensing Element: Ceramic
Connection: 316L SS
O-Ring: Viton; others
available on
request
Housing Material: 304 Stainless Steel
Response Time: 0.5 Sec.
Dampening: User
programmable
averaging over 1,
2, 4, 8, 16, 32 or 64
samples
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Electrical Data
Power Required: 24 VDC ±10%
80 mA + Switch
Load
Switch Type: Transistor NPN or
PNP based on
model number
Switch Rating: 300 mA Max. short
circuit protected
Switch Logic: User
programmable
Electrical
Connection: 4-Pin Micro-DC,
male
Electrical
Protection: NEMA 4/IP 65
Programmable Features
-
Zero (Tare)
- Setpoint
- Hysteresis
- Window Mode
- Dampening
- Switching Logic
- Lockout Code
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Ordering Information
Dimensions:
Electrical Installation
The following electrical installation instructions and precautions must followed to insure
proper switch and analog output operation. Failure to follow these instructions may result
in irreparable damage to the switch:
- The unit employs an open collector NPN or PNP transistor switch. To verify
which model you are installing check the model number codes in Section 2.0,
Specifications. When the PNP version activates, it connects the DC supply
voltage to the switch output pin. When the NPN version activates, it connects
the DC ground to the switch output pin.
- This switch can only switch fixed polarity DC loads with a maximum current
draw of 300 mA To switch higher current DC loads or AC loads use an
appropriately sized relay.
- In order to minimize electromagnetic noise pickup, a jacketed instrument and
control cable with shield should be used. The shield should be connected to
the power system earth ground at one end of the cable only.
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