A Pulsafeeder toroidal (electrodeless) conductivity probe for use with Pulsafeeder controllers.
Some ratings are not filled in yet. Check the manufacturer’s current datasheet before wiring.
¶ What it measures
Conductivity — see Conductivity.
¶ Electrical interface
| Model | From datasheet — to be filled in |
| Output | Connects to a MicroVision EX probe input; the conductivity probe is prewired to Probe 1 (make-up conductivity to Probe 4) |
| Controller reading range | 0–9,999 µS/cm in 1 µS/cm steps |
| Temperature compensation | Built in; compensation range 0–50 °C (32–122 °F) |
| Process connection | From datasheet — to be filled in |
| Pressure and temperature limits | 125 psi (8.6 bar), 50 °C (122 °F) maximum |
| Materials | Polypropylene |
| Maximum cable length | 30.5 m (100 ft) |
The compensation, pressure, temperature, material and cable figures are Pulsafeeder’s specification for the toroidal probe supplied with the MicroVision EX. Pulsafeeder supplies it already installed in a tee. It works by driving an AC current through one coil, which induces a current in the water and, in turn, in a second pick-up coil; the pick-up current is proportional to conductivity.
¶ Maintenance
A toroidal probe has no metal electrodes to foul, so it needs no electrode cleaning and no routine recalibration.
- Inspection — Pulsafeeder recommends inspecting the conductivity probe every 6 months.
- Cleaning — to remove it, turn off power, close the hand valves before and after the flow assembly, open the sample port, and unscrew the coupling nut. Wipe the probe with a clean cloth, including inside the center hole (keeping the hole free of deposits is standard practice for toroidal probes).
- Flow and placement — water must flow around the probe and through its center hole. Keep it clear of pipe walls and other objects near the hole, which affect the measurement (standard practice for toroidal probes).
- Calibration — optional, to set a baseline or match a hand-held meter. Calibrate in-stream from the MicroVision EX Probe Cal screen: circulate at least 1 GPM past the probe for 15 minutes, draw a sample, measure it at once with a temperature-compensated meter, and enter the value. If the probe and meter differ by more than 25 counts, check that the sample is within 1 °C of the probe temperature.
- Removal — always depressurise the piping before removing the probe.
¶ Using it with a controller
Wiring and configuration live with each controller:
- MicroVision EX — see MicroVision EX. A setup guide is not written yet.