4TX Line Powered Transmitter for Analog pH & ORP Sensors


Model 4TX Single Channel pH, ORP & Temperature Meter & Analyzer

  • pH/ORP MEASUREMENT & CONTROL
  • USER SELECTABLE ATC PROBE
  • (PT-1000, 10K THERMISTOR & 3K BALCO)
  • FOUR PROGRAMMABLE RELAYS FOR pH or ORP
  • REVERSIBLE AND ISOLATED 4-20 mA OUTPUT
  • BUMPLESS CALIBRATION
  • -10 TO + 120 C TEMPERATURE COMPENSATION
  • CUSTOM DESIGN LARGE DISPLAY LCD
  • MEMBRANE SWITCH WITH AUDIO FEEDBACK
  • AUTOMATIC TEMPERATURE COMPENSATION
  • HIGH 50/60 Hz NOISE REJECTION
  • POWER DOWN MEMORY BACK-UP
  • WATERTIGHT IP65 1/4 DIN ENCLOSURE
  • PROGRAMMABLE DELAY FOR WASH RELAY
  • CE APPROVED

RS-485 Communications Protocol Documentation

COMPARISON CHART OF 3TX, 2TX & 4TX TRANSMITTERS

MeasurementInputMeasurement RangeOutputsCalibration PointsCompatible Sensor(s)Special Features
pHSingle Channel
– pH
pH – 2.00 to 16.00 pHCurrent Output Range 4 to 20 mA (isolated), programmable span
Maximum Load 500 ohm
Accuracy ± 0.02 mA
– Built-in 6 point predefined  or manual calibration option.– User selectable- ATC probe: Pt-1000 thermistor or 3k Balco– Cost Effective
Transmitter for monitoring or control- RS-485 Output
ORPSingle Channel
– ORP
mV (absolute) – 2500 to 2500Current Output Range 4 to 20 mA (isolated), programmable span
Maximum Load 500 ohm
Accuracy ± 0.02 mA
– Manual calibration option.– User selectable- ATC probe: Pt-1000 thermistor or 3k Balco– Cost Effective
Transmitter for monitoring or control- RS-485 Output