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HM-500 Oil in Water Sensor
- Product Details
- Specifications
- Leak Detection & Wastewater
- Installation
- Video
HM-500 Oil in Water Sensor
The Pyxis HM-500 is an inline sensor that measures oil in water continuously, from 0 to 10 ppm. A 365 nm UV LED shines into the sample, and the sensor measures how strongly the oil in it fluoresces. Readings are in ppm of marine offshore oil, and the sensor can be calibrated for the oil on your own site.
It wires straight into a controller, PLC or DCS through 4–20 mA and RS-485 Modbus, and comes with the ST-001 CPVC inline tee (¾” female NPT).
Corrects for Colour and Turbidity
Real water is rarely clear, and colour or cloudiness throws out an ordinary fluorometer. The HM-500 has extra optical channels that measure the colour and turbidity of the sample and correct the oil reading for them, up to 150 NTU and colour equal to 10 ppm iron. Its flow path is short and open, so it is quick to clean, and the uPyxis® app can tell you in seconds whether it needs cleaning.
Specifications
| Item | HM-500 |
|---|---|
| Part Number | 52101 |
| Range | 0 – 10 ppm, as marine offshore oil |
| Detection Limit | 0.1 ppm |
| Reproducibility | 0.1 ppm or 3% |
| Method | UV fluorescence |
| Light Source | 365 nm UV LED |
| Fluorescence Measured | 410 / 470 nm |
| Colour and Turbidity Compensation | Up to 150 NTU turbidity and colour equal to 10 ppm iron |
| Outputs | 4–20 mA and RS-485 Modbus RTU |
| Wireless | Bluetooth® with the MA-WB adapter or PowerPACK (uPyxis® app) |
| Power Supply | 24 V DC (±2 V), 65 mA |
| Body Material | CPVC |
| Installation | ST-001 inline tee, ¾" FNPT (supplied) |
| Maximum Sample Pressure | 7 bar (100 psi) |
| Operating Temperature | 4 – 49 °C (40 – 120 °F) |
| Storage Temperature | −7 – 60 °C (20 – 140 °F) |
| Dimensions | 173 mm long, 37 mm diameter (6.8" × 1.4") |
| Weight | 170 g (0.37 lb) |
| Protection | IP67, fully dustproof and waterproof |
| Approvals | CE |
| Cable | 1.5 m (5 ft) cable with IP67 adapter, or 0.6 m (24") flying lead with IP67 adapter |
The HM-500 is used wherever a small amount of oil has to be caught early: cooling water leaving a heat exchanger, the area around oil tanks, the feed to UF and RO membranes, reinjection water, and industrial wastewater, marine discharge, site runoff and stormwater. Because it reads continuously and sends the result to the control system, a leak shows up as soon as it starts rather than at the next sample.
Key Features
- Range 0 – 10 ppm, detection limit 0.1 ppm
- UV fluorescence with a 365 nm LED light source
- Automatic correction for colour and turbidity, up to 150 NTU
- Short, open flow path, removed for cleaning without tools
- Cleanliness check, calibration and setup over Bluetooth® in the uPyxis® app, with the MA-WB adapter or a PowerPACK
- Calibrate for your own oil type, then use the OIW-500 secondary standard for routine calibration
- 4–20 mA and RS-485 Modbus RTU outputs
- Supplied with the ST-001 CPVC inline tee, ¾” FNPT
- MA-102S submersion adapter kit available for open tanks
- IP67, fully dustproof and waterproof
Fitting
Fit the O-ring into the groove of the ST-001 tee, push the sensor in and tighten the tee nut by hand to seal it. The tee has ¾” female ports, threaded or solvent socket. For open tanks, use the MA-102S submersion adapter kit instead.
Wiring
The sensor runs on 24 V DC at 65 mA, usually taken from the controller. Power negative and 4–20 mA negative share the black wire, so a controller with an isolated 4–20 mA input may need a jumper between the two negative terminals.
Calibration
- First calibration: zero in deionised water, then slope with a 1 – 10 ppm solution of your own oil, checked by laboratory analysis or the HM-900 handheld analyser.
- After that: a 5 ppm solution made from 2 mL of OIW-500 standard in 198 mL of deionised water, mixed fresh each time.
- Run the cleanliness check first, and keep direct sunlight off the sensor while calibrating.
