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PSC-154: TDS/EC Controller with 4-20mA Output

New controller includes extended range, digital calibration, on-screen temperature, tri-color display and 4-20mA output.

Instruction Manual


  • Monitors and controls TDS/EC levels for high output commercial systems.
  • Large, bright L.E.D. display.
  • 4-20mA output signal can connect to a PLC to record values.
  • An alarm will sound if the TDS /EC level rises above the user-set level.
  • A switch will control a device based upon the set point.
  • On-screen temperature display (C/F).
  • Installs easily in minutes.
  • Includes one sensor probe (at no extra cost) (part #SP-1-PSC).
  • Protective cover also available (sold separately)


EC Range: 0-9999 µS
TDS Range: 0 - 5000 ppm
Temperature Range: 1-75°C; 33-167 °F 
Accuracy: ±2% (of the reading)
Conversion Factor: NaCl (avg. 0.5)
Resolution: 0.1 µS/ppm (0-999); 1 µS/ppm (1000-9999)
ATC: Yes (1 - 65°C)
Calibration: Digital by push button
Set-Point: Single point, controlled by on-screen up/down buttons (to any point within the range)
Relay Control: The unit will open or close a circuit via dry contacts when the ppm/µS level reaches or exceeds the control setting (simple switch).  It can be used to control a pump, solenoid valve or other device. 
Relay Voltage: 5V
Output Signal: 4-20mA
Output Accuracy (mA): ±1%
Alarm: Optional steady beep (set by user)
Display: Bright 5/8" L.E.D. display
Probe: 1/2" bushing (NPT), 3 meter (9.8 ft) shielded cable
Power supply: AC 110V / AC 220V
Dimensions: 7.2 x 7.2 x 11.1 cm (2.8 x 2.8 x 4.4 in.)
Monitor Weight: 241 g (8.5 oz)
Total (Shipping) Weight: 610 g (1 lb 5.5 oz)