Potentiometer to Analog Signal Conditioners, Converters, Isolators, Transmitters, Alarms

  • 6 Year Warranty on API Modules
  • LoopTracker® I/O LEDs
  • Hot-Swappable Plug-In Design
  • Zero and Span Output Calibration
  • Push to Test Output
  • Full I/O/Power Isolation
Product brochure
Options & accessories
Regulatory compliance

Click on PDF links below
for product information
Reference Info
Ground Loops
LoopTracker and Output Test
Sink vs Source

Manual burner control
Motor load control
Milling machine feed
Phase separtor water level
Damper position
Phase separtor water level
Fail safe valve control
Municipal water tower level
Blower louver position
Steam Condensate Monitoring
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Model Input/Output Features Product

Potentiometer Input Alarm Trips

Factory Configured

APD 1800  from $379
APD 1820  from $399

Open Datasheet
Download Datasheet
Any full-range potentiometer
0-100 Ω to
0-1 Mega Ω

APD 1800 Single Alarm Trip
Dual SPDT contact sets
Standard: HI alarm, non-latching, normal acting
See data sheet for alarm options

APD 1820 Dual Alarm Trip
2 independent SPDT contact sets
Standard: HI/LO alarms, non-latching, normal acting
See data sheet for alarm options

  • User adjustable setpoint(s)
  • User adjustable deadband(s)
  • 8 Amp SPDT contacts
  • Input LoopTracker LED
  • Alarm status LEDs
  • Alarm options: LO, HI/HI, LO/LO, band alarm
  • Optional reverse acting
  • Optional latching alarms
  • Push to test/reset
  • Remote push to test/reset
  • Full I/O/power isolation
  • Removable plugs
  • DIN rail mount without tools
  • Universal power 85-265 VAC, 60-300 VDC
  • D option for 9-30 VDC, 10-32 VAC power

APD 1800UL approved
APD 1800, APD 1820