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CR-300 Wired LPR Corrosion Rate Sensor
- Product Details
- Specifications
- Applications & Features
- Package & Accessories
CR-300 Wired LPR Corrosion Rate Sensor
Real-Time Corrosion Monitoring for Cooling and Process Water
The Pyxis CR-300 measures how fast the system’s metal is corroding, as it happens. It uses linear polarisation resistance (LPR) on a pair of test electrodes made from the metal of interest, and reports the general corrosion rate in mils per year (mpy; 1 mpy = 0.0254 mm per year).
It also measures electrochemical noise, which gives an index of localised corrosion (pitting). Both readings come out on 4–20 mA and RS-485 Modbus, so the sensor connects straight to a controller, PLC or DCS from a 24 V DC supply.
Signal Processed Inside the Sensor
The weak LPR signal is conditioned, amplified and digitised inside the sensor body, so long cable runs do not degrade it and no separate transmitter box is needed. The sensor also measures the water’s conductivity and corrects the corrosion reading for it, up to 10,000 µS/cm.
LPR Sensor or Corrosion Coupons?
A coupon shows the average corrosion over the weeks it was in the water. The CR-300 shows the corrosion rate now, so the effect of a change in treatment is seen within hours. The two readings follow each other but are not expected to match exactly; the LPR reading is best used for trends and day-to-day control.
CR-300 Specifications
| Item | CR-300 | CR-300-BSP |
|---|---|---|
| Part Number | 51007 | 51025 |
| Process Connection | 1" MNPT | 1" MBSP |
| Power Supply | 24 V DC, 2 W | |
| Outputs | Two 4–20 mA (general and localised corrosion) and RS-485 Modbus | |
| Wireless Access | Bluetooth® via the MA-CR adapter (supplied) and the uPyxis® app | |
| General Corrosion Range | 0.001 – 10 mpy by default, set by the metal; up to 995 mpy | |
| Localised Corrosion Range | Index 0.001 – 100 | |
| Resolution | 0.001 mpy | |
| Alloy Factor | 0 – 3, set by the metal's UNS code, adjustable | |
| Conductivity Compensation | 10 – 10,000 µS/cm | |
| Reading Interval | 3 – 1,440 minutes (over 3 minutes for localised corrosion) | |
| Working Pressure | Up to 7 bar (100 psi) | |
| Working Temperature | −10 – 50 °C | |
| Storage Temperature | −20 – 70 °C | |
| Body Material | 304 stainless steel | |
| Dimensions | 281.5 mm long; 23 mm diameter (lower), 43 mm (upper) | |
| Weight | 687 g | |
| Cable | 1.5 m, extension cables available | |
| Protection | IP65 | |
| Approvals | CE, RoHS | |
Applications
- Cooling tower and process water treatment
- Data centre cooling: condenser water and technology cooling loops
- Closed loop and once-through systems
- Mill supply water
- Domestic water monitoring
Key Features
- General corrosion rate from 0.001 mpy, plus a localised (pitting) corrosion index
- Wired 24 V DC: two 4–20 mA outputs and isolated RS-485 Modbus
- Conductivity compensation up to 10,000 µS/cm
- Signal processed inside the sensor: no separate transmitter
- Stainless steel body with anti-interference (anti-EMI) design
- Over 20 metals pre-set in the uPyxis® app, with ranges and alloy factors that can be adjusted
- Bluetooth® set-up and live readings via the uPyxis® app, with the MA-CR adapter supplied
- Three O-ring grooves to set the insertion depth
- 2.0 mpy and 0.1 mpy calibration check caps supplied
- 1″ NPT or 1″ BSP thread
Supplied with the CR-300
- CR-300 sensor (1″ NPT or 1″ BSP)
- Mild steel electrode pair and copper electrode pair
- 2.0 mpy and 0.1 mpy calibration check caps
- 1.5 m extension cable with 8-pin connectors
- 1.5 m flying-lead cable with an 8-pin connector
- MA-CR Bluetooth® adapter for the sensor
- USB Bluetooth® adapter for a PC
Accessories
- Electrode pairs: mild steel, copper, admiralty brass, aluminium 6061 and others
- Calibration check caps: 2.0 mpy and 0.1 mpy
- 8-pin extension cables: 1.5, 3, 6, 15 and 30 m