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Quantrol Inline Corrosion Sensor - 4-20mA / RS485 Modbus - CR-300

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Quantrol Inline Corrosion Sensor -  4-20mA / RS485 Modbus - CR-300
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Quantrol Inline Corrosion Sensor -  4-20mA / RS485 Modbus - CR-300

Quantrol Inline Corrosion Sensor - 4-20mA / RS485 Modbus - CR-300


CR-300 Inline Corrosion Sensor - 4-20mA / RS485 Modbus by Quantrol

The use of the LPR corrosion rate represents a valuable tool that can be easily and affordably deployed to provide both general and localized corrosion measurements in an instantaneous format. There is a common industrial misnomer that the use of inline LPR corrosion sensors should be identical to that of corrosion coupons. The LPR corrosion level represents the real-time electrochemical measurement of corrosion. While it may be linear with respect to the corrosion rate obtained from the weight loss of a coupon exposed to water for a long period, the LPR corrosion rate may not necessarily be the same exact value of the latter. The instantaneous nature of the device measurement represents a "real-time condition" on an MPY scale based on the specific metallurgy being assessed and will in many cases vary, in a short time scale, from a corrosion coupon. The LPR data should be used to best understand the linear relationship with coupons and for real-time application performance assessment and adjustment.

The Pyxis CR-200/300 corrosion rate sensors are ideal for cooling and process water treatment monitoring where robustness and affordability are a must. The sensors utilize the linear polarization resistance (LPR) method to produce a raw signal. The raw signal is conditioned, amplified, and digitized directly in the sensor itself. This avoids the interferences and attenuation of the raw signal caused by long-distance wiring needed for other corrosion probes to a separate signal conditioner or transmitter box. The Pyxis corrosion sensors measure sample water conductivity directly and compensate for the conductivity impact on the LPR measurement. These unique product characteristics make the Pyxis LPR superior in performance and accuracy.

In addition to the LPR measurement to obtain the general corrosion rate, the CR-200/300 sensors also measure electrochemical noise. The measured noise data is used to calculate an index to quantify the localized corrosion rate also referred to as pitting.

The CR-300 is a standalone sensor that can be powered by a 24 VDC power source such as an existing controller or PLC.

The CR-200 is a battery powered and Bluetooth® enabled corrosion sensor for true wireless connectivity. A centralized Bluetooth® enabled display panel available via the BTA-100 for single probe or the BTA-400 for multiple probes can be used to display the readings from an array of CR-200 sensors. The CR-200 makes it possible to monitor corrosion at multiple test points, avoiding the complications of running power and signal output wires from the sensor to a controller and/or display unit. The CR-200 sensor can store up to 6-months' worth of data that can be wirelessly downloaded to a computer or phone using the uPyxis APP.

The CR-300, with the addition of a Pyxis Bluetooth Adpter (MA-WB), and the CR-200 can both communicate with any smart device via the uPyxis app. The uPyxis app, available for all smart phones and computers, is used to configure and obtain current sensor readings. Additional diagnostic information is available and can be used for determining the sensor performance or the need for maintenance.

The CR-200/300 sensors accept various test metal electrodes commonly used in the industry (LowCarbon Steel, Copper, Admiralty Brass, 304 Stainless Steel, Copper Nickel, Aluminum 1100 &6061).


Cooling & Process Water Monitoring

Key Features

  • Anti-electromagnetic interference (anti-EMI) design with stainless steel sensor body
  • MODBUS support with isolated RS-485 communication
  • Battery life up to 1 year thru using our ultra-low power design and smart power management
  • Three O-ring grooves positioned on the sensor body allow insertion depth control
  • Bluetooth connectivity to uPyxis app: Downloadable at Google Play Store or Apple App store
  • Ultra-low corrosion rate down to 0.001 MPY can be accurately measured
  • Generalized Corrosion & Localized Corrosion Rate
Power Supply
3.6V ER26500 battery
24 V 2W
Bluetooth 4.1
Isolated RS-485 MODBUS and two 4-20 mA
Data Storage
6 months (30 minutes per measurement)
10.3 in (260.5 mm) long, 0.9 in (23.0 mm) diameter lower portion, 1.7 in (43.0 mm) upper portion
11.1 In (281.5 mm) long, 0.9 in (23.0 mm) diameter lower portion, 1.7 in (43.0 mm) upper portion
655 g with battery
687 g
Cable Length
5 ft (1.5 m), extension cable available
Range, general corrosion
0.001 - 10 MPY
Range, localized corrosion
0 - 100 (304 stainless steel in 10% ferric chloride as 100)
Conductivity Compensation
10 - 10,000 μS/cm
Sample Temperature
-20 - 50 °C
Reading Interval
1 min, 2 min, 5 min, or 20 min
0.001 MPY
Alloy Factor
0 - 3
Flow cell with 1-inch NPT
Enclosure Material
304 stainless steel
Working Pressure
Up to 100 psi (7 bar)
Working: -10 - 50 °C Storage: -20 - 70 °C

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