• Pressure control with internal stainless steel diaphragm
  • 4 switching outputs and 1 analog output
  • High accuracy with fully adjustable deadband
  • Easy-to-read LED display with scalable bar graph
  • Capable of switching both AC and DC loads
  • Fully configurable via keypad

Barksdale's UDS3 Electronic Pressure Switch offers the unique ability to switch four discrete circuits in a single, compact unit. In addition to its four SPDT relays, the UDS3 comes tandard with either a 4-20 mA or a 0-10 VDC analog output and a digital pressure display with 1/2" tall, easy-to-read digits. A scalable bar graph display provides even greater visibility. Analog outputs are scalable from 25% to 100% of the full adjustable range. A 12-bit microprocessor provides built-in diagnostics and allows for switch time delays and pressure cycling up to 100 times per second. Pressure units may be readily toggled between psi, bar, kPa, °C and °F units. For applications requiring precision pressure control, multiple switchpoints and extremely long life, the UDS3 Series is the ideal solution.


General Specifications*

Accuracy: 0.5% FS
Linearity Error: ±0.5% f. s. at 77°F (25°C)
Repeatability: ±0.1% f. s.
Sensor Element: Piezoresistive silicon measuring cell
Wetted Parts:
304 stainless steel
Cast aluminum FKM
Polyester fi lm
Measuring Ranges: 0 – 9,000 psi, gauge
Measuring Ranges (psi): 150 750 1500 3000 6000 9000
Proof Pressure (psi): 220 1100 2175 4400 9000 11600
Process Connection: 1/4“ NPT F
Option : G1/4 F, bottom entry
Electrical Connection: Plug-in, terminal strip with 14 slots for 1.5 mm2, 14 AWG slots
Power Supply: 18 – 32 VDC, reversed polarity protected
Scanning Rate:
12 bit (4096 steps per span)
1000 / s
Time Constant: Approx. 40s
Analog Output:
Current Output:

Load Influence:
Scanning Rate:
Voltage Output:
Adjustment Range

4-20 mA
max. Rl = (Ub-12 V) / 20 mA
Rl= 600 Ohm at Ub = 24 VDC
0.3% / 100 Ohm
1 ms
0 – 10 VDC
max. 10 mA, short circuit-proof
25% to 100% f. s.
Switching Output(s):
Switching Function:
Contact Rating:

Switching Rate:
Operation Time:
Status Display:

Normally open / normally closed, analog output, standard-/windows-mode
max. 120 VDC / 250 V AC
max. 12 W / 1250 VA
1 million @ 24 VDC/2A
max. 20 / s
0.0 to 9.9 s adjustable
1 mS
S1 to S4 on LCD display
Digital Display:
Trend Arrows:
Display Range:
Display Rate:
Display Unit:
8-digit 14-segment LCD display
0.5 in. (green)
Last value change
-9999 to 9999
4 / s
bar / psi / psi x 10 / hPa / mbar / °C / °F
Operating Elements: Keypad with easy response push buttons
Temperature Range:
-13° to 212°F (-25°C to +100°C)
14° to 158°F (-10°C to + 70°C)
-22° to 176°F (-30°C to + 80°C)
Temperature Influence: ±0.2% f. s. /10K
Compensation Range: 14° to 158°F (-10°C to +70°C)
Power Consumption: appr. 350 mA at Ub = 24 V DC (without load)
Protection Class: IP65
Dimensions (Housing): 3.9 (W) X 5.3 (H) X 3.1 (D) inches
[100 (W) X 135 (H) X 80 (D) mm]
Cable Gland: 1 x PG 13.5 side entry = standard
Additional Features: 8-digit 14-segment LCD display with bargraph and trend indication, microcontroller, self monitoring, all parameters are confi gured by keypad, selective keypad lock, high accuracy,
quick scanning rate (1 ms).
Weight: pprox. 2 lb
* See product confi gurator for additional options.


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