SPIRAX SARCO · BOILER CONTROLS & INSTRUMENTATION
Spirax Sarco CP42 Twin Tip Conductivity Probe for Boiler TDS Control
Spirax Sarco CP42 conductivity probe for boiler TDS monitoring & blowdown control. Built-in temp sensor, scale detection. Up to 32 bar g.
Overview
The Spirax Sarco CP42 is a twin tip conductivity probe designed to measure the conductivity (Total Dissolved Solids or TDS) of boiler water. When used with a compatible controller, the CP42 enables accurate monitoring and automatic control of boiler blowdown, helping maintain optimal water quality and boiler efficiency.
A key feature of the CP42 is its built-in temperature sensor, which eliminates the need for a separate boiler penetration for temperature measurement. The probe also incorporates patented scale detection and compensation technology—when scaling is detected, the system automatically initiates a probe conditioning cycle that renders scale porous or removes it, allowing the probe to maintain its original calibration accuracy.
The CP42 is suitable for steam boilers operating up to 32 bar g and 239°C. It connects via a ½" BSP male thread to Spirax Sarco probe elbows, screwed flanges, or directly into boiler connections. Available in three tip lengths to accommodate different boiler configurations.
Key Features
- Twin tip design for reliable conductivity/TDS measurement in boiler water
- Integrated temperature sensor—single boiler connection required
- Patented scale detection with automatic probe conditioning cycle
- Suitable for high-pressure steam boilers up to 32 bar g (239°C)
- IP54 ingress protection rating
- Stainless steel construction (Type 304L/316L) for corrosion resistance
- Available in 300 mm, 500 mm, and 1000 mm tip lengths
- Compatible with Spirax Sarco TDS controllers
Specifications
| Parameter | Value |
|---|---|
| Maximum Boiler Pressure | 32 bar g (464 psi g) |
| Maximum Operating Temperature | 239°C (462°F) |
| Maximum Ambient Temperature | 70°C (158°F) |
| Cold Hydraulic Test Pressure | 60 bar g |
| Minimum Conductivity | 10 µS/cm or 5 ppm |
| Minimum Tip Distance from Boiler Tubes | 10 mm |
| Minimum Immersion Depth (Vertical) | 100 mm |
| Process Connection | ½" BSP Taper (½" NPT) |
| Degree of Protection | IP54 |
| Available Tip Lengths | 300 mm, 500 mm, 1000 mm |
| Body Material | Austenitic Stainless Steel Type 304L |
| Cover Tube Material | Austenitic Stainless Steel Type 316L |
| Sensor Tip Material | Austenitic Stainless Steel UGINE 4632 |
| Weight (300 mm) | 0.85 kg |
| Weight (500 mm) | 0.97 kg |
| Weight (1000 mm) | 1.22 kg |
Applications
The Spirax Sarco CP42 conductivity probe is used across industries where steam boilers require precise TDS control and blowdown management:
- Power generation plants - Chemical and petrochemical processing - Pharmaceutical manufacturing - Food and beverage production - Textile mills - Paper and pulp industries - Refineries and fertilizer plants - Any facility operating steam boilers requiring water quality monitoring
Frequently Asked Questions
Get a Quote
Contact PC Engineering for pricing, availability, and technical support for the Spirax Sarco CP42 Twin Tip Conductivity Probe. Call us or fill in our inquiry form — our engineers will respond within 24 hours.
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