• Integrated trip amplifier
  • 12-bit analog-digital converter
  • For pressure, temperature, level and flow
  • Monitors and controls any sensor with analog output
  • Ideal companion to our 400-series pressure transducers
  • Four switchpoints in a single, compact unit
  • Easy-to-read LCD display with scalable bar graph
  • UL/CSA approved

Barksdale's UAS3 Electronic Trip Amplifier and controller is the perfect companion to any sensing device that provides a 4-20 mA or 0-10 VDC analog output. Our UAS3 offers the unique ability to switch four discrete circuits in a single, compact unit. In addition to its four SPDT relays, the UAS3 comes standard with either a 4-20 mA or a 0-10 VDC analog output and a digital display with 1/2" tall, easy-to-read digits. A scalable bar graph display provides even greater visibility. Analog transducer 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. Display units may be readily toggled between psi, bar, kPa, °C and °F units. For applications requiring precision control, multiple switchpoints, and extremely long life, the UAS3 Series is the ideal solution.


General Specifications*

Accuracy: 0.2% f. s.
Linearity Error: ±0.2% f. s. at 77°F (25°C)
Repeatability: ±0.01% f. s.
Housing (Electronics):
Seal (Housing):
Cast aluminum
Polyester fi lm
Measuring Ranges: (free scalable): -9999 to +9999
Measuring Principle: Amplifier with 12 Bit A/D-converter
Electrical Connection: Plug-in, terminal strip with 14 slots for 1.5mm2 , 14 AWG slots
Sensor Connection: Plug 3-pin acc. to DIN 43650 / meter including electrical plug with molded cable
Cable Gland: 1 x PG 13.5 side entry – standard
Power Supply: 18 – 30 VDC, reversed polarity protected
Power Consumption: appr. 350 mA at Ub = 24 VDC (without load)
Scanning Rate:
12 bit (4096 steps per measuring span)
1000 / s
Analog Inputs:
Current Input:
Voltage Input:
Resistance Input:
4 – 20 mA
0 – 10 VDC
0.5 – 100 kOhm
PT100 element acc. to IEC751
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 V DC
max. 10 mA, short circuit-proof
25% to 100% f. s.
Switching Output(s):
Contact Rating:

Switching Rate:
Operation Time:
Status Display:

max. 120 VDC / 250 VAC
max. 120 W / 1250 VA
1 million at 24 VDC / 2 A
max. 20 / s
0 – 9.9 s adjustable
1 mS
S1 to S4 on LCD display
Digital Display:
Bar Graph:
Display Range:
Display Rate:
Display Unit:
8-digit 14-segment LCD display, height 1/2 in (12 mm)
-9999 to +9999 (scalable)
psi / bar / kPa / °C / °F
Operating Elements: Keypad with easy response push buttons
Temperature Range:
14° to 158°F (-10 °C to + 70 °C)
-22° to 176° F (-30°C to + 80°C)
Temperature Influence: ±0.05% f. s. / 10K
Compensation Range: 14° to 158°F (-10° to +70°C)
Protection Class: IP65
Dimensions (Housing): 3-15/16 W X 5-5/16 H X 3-3/16 D
(100 W X 135 H X 80 D)
Additional Features: 8-digit 14-segment LCD display with bargraph and trend indication, microcontroller-controlled, self monitoring, all parameters are configured by keypad, selective keypad lock, high accuracy, quick scanning rate (1 ms).
Weight: appr. 2 lb (1080 g)
* See product confi gurator for additional options.


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