APT2000PH Intrinsically Safe ph/ORP Transmitter

The Analytical Process Analyzer (APT) 2000 series offers the widest available selection of advanced features in a reliable and economical instrument. The advanced features of the APT4000 analyzer guarantee complete reliability. The APT2000 continuously monitors sensor and analyzer electronics and immediately displays diagnostic information at the onset of a problem. If an error or diagnostic is found, the analyzer will indicate the appropriate error code or pictograph, blink a red LED and adjust the error current to 22 mA if desired. A manual loop-back check is available to test the integrity of the 4-20 mA output.

APT2000 has a large front display for quick recognition of process parameters and diagnostics even at a distance. Only the APT2000 employs visual feedback to reduce setup and maintenance times and to minimize errors made during calibrations. Visual feedback refers to pictograph type characters that appear on the display both to prompt and respond to operator and process changes. Pictograph type characters also appear during problem conditions to report diagnostics for easy troubleshooting. There is even a Sensoface pictograph that provides constant feedback to the operator on whether or not there is a problem with the sensor when used with Honeywell's Meredian glass pH/ORP electrodes. These easily learned and recognized symbols make the APT2000 an easy-to-use instrument in any language.

The APT2000PH transmitter is a two-wire 24-volt device that continuously measures pH or ORP in industrial processes including chemical, pharmaceutical, petrochemical, pulp and paper, and wastewater. The APT2000's water and corrosion-resistant, IP65-rated enclosure is specifically designed to meet the measurement needs of intrinsically safe, non-incendive (Class 1, Division 1) and general purpose areas. Honeywell pH or ORP sensors, even alternate electrodes, can be used as input to the transmitter. A 4-20 mA output is standard on the APT2000PH. For bi-directional remote monitoring/control of the process, the HART communications protocol is available as an option.

Calibration is easy with automatic buffer recognition, utilizing a variety of buffer standards recognized worldwide. Foolproof calibrations are ensured with special on-board diagnostics that monitor the step-by-step progress of each calibration. Simple messages with pictographs provide feedback on the status of the calibration. Manual one or two-point calibrations can also be performed for complete flexibility.



  • Large display with easy-to-read 0.75 inch digits indicating measured value giving process information at a glance
  • Simple operator interface with basic pictographs enabling fast calibration/configuration setup
  • Application in hazardous and safe areas with intrinsic safety to FM, VSA, ATEX approvals
  • HART bi-directional communications protocol giving added visibility and control over end user
  • Continuous diagnostics for monitoring calibration, probe health, and transmitter self-test
  • Manual loop-back check for integrity of 4-20 mA output
  • Robust, tightly sealed plastic enclosure rated IP 65
  • Wall, pipe or panel mounting
  • Easy installation with preassembled empty enclosure and plug-in terminals
  • Optical alarm signaling by blinking red LED
  • Quick response time (less than five seconds per step change)
  • Integrated current source for simple checking of peripheral devices



APT2000 pH Datasheet