MicroPM Temperature Probes

The MicroPM Temperature Probes are designed for precise, stable temperature measurements, with robust features for calibration management, installation flexibility, and accurate performance monitoring over extended periods.

Design Features:

Dual sensors with high sensitivity and stability.

Firmware corrects for viscous heating effects due to fluid kinetic energy dissipation.

Early digitization in probe handle for independent calibration and minimal external interference.

Design reduces differential stem effects, vibration heating, and stress.

CoolTip™ technology minimizes differential self-heating effects (< 0.02 mK).

Installation

Probes are inserted into thermowells at tapping points. The thermowell and probe design may vary with maximum temperature and pressure.

Can be installed with separate or same point fixing as pressure probes, using custom tee-pieces for integration.

Measurement Accuracy

Measures differential temperature (dT) to better than 1 mK.

Accuracy supports measurements for pump heads down to 10 m of water.

Calibration and Maintenance

Each probe has dual sensors; discrepancies between sensors trigger alerts.

Alerts are set in firmware with a typical delay of 1 minute to avoid nuisance warnings.

Long-term stability minimizes calibration needs; portable indicators can identify faulty sensors.

Maintenance involves replacing probes with spare matched sets, taking less than 30 minutes.

Specification and Description

Type: UPM-T6-6-210-M (variants available for higher temperatures and pressures).

Measuring Range: 0 – 45°C (can be extended to 60°C with calibration).

Number of Probes: 2 per pump monitor.

Number of Sensors per Probe: 2, with automated calibration comparison.

Uncertainty of Differential Temperature Calibration: < 0.2 mK.

Long-Term Stability: < 1 mK over 10 years.

Signal Processing: Digitization in probe handle.

Power Supply: 8 to 12 VDC, < 10 mA per probe.

Output Communication: RS485 half-duplex.

IP Rating: IP68 when inserted in thermowell.

Temperature probe application:

Table 1 shows dT as a function of pump efficiency and head, at a water temperature of 10 °C. The signal increases slightly with water temperature:

Table 1. dT (mK) at 10 °C (1 mK = 0.001°C).

Table 2 shows the effect on the pump efficiency measurement of an uncertainty in dT of 1 mK:

function of pump efficiency and head at a water temp of 10 degress.webp

Table 2. % change in pump efficiency, for a 1mK variation in dT, at 10°C.