Sensor Help
Sensors — Help & Support
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Use the CS10S for 414R resistivity monitors. Use the CTS1 for 414C conductivity or 414TDS monitors.
CS10S
For 414R resistivity monitors in high-purity water applications where accurate resistivity measurement depends on a submerged stainless steel sensor with the correct cell constant.
CTS1
For 414C and 414TDS monitors where conductivity measurement and temperature compensation depend on the correct plastic-body sensor and cell constant.
CS10S Resistivity Sensor
Stainless steel resistivity sensor designed for high-purity and ultra-pure water systems. For use with 414R resistivity monitors.
CS10S Installation
CS10S Wiring
| Wire Color | Function | Terminal |
|---|---|---|
| White | Outer electrode (body) | TB1-7 |
| Black | Inner electrode | TB1-8 |
| Shield | Ground | TB1-9 |
| Red | Temperature | TB1-10 |
| Green | Temperature | TB1-11 |
The CS10S uses an inner and outer electrode design (black = inner, white = outer/body). Refer to the 414R User Manual for the complete wiring diagram.
How the CS10S Works
- Measures resistivity by passing a signal between stainless steel electrodes with a cell constant of 0.05, optimized for high-purity water (0–18.2 MΩ·cm).
- Includes an integrated thermistor for automatic temperature compensation to 25°C by the 414R monitor.
- Designed for continuous-flow applications where the sensor remains submerged during operation.
CS10S FAQ
Can I use a different resistivity sensor with the 414R?
No. The 414R is designed exclusively for the Hydro-Check CS10S sensor. Other resistivity sensors have different cell constants and wiring configurations and will not produce correct readings.
Does the CS10S require calibration?
No. The CS10S sensor does not require calibration. Calibration is performed on the 414R monitor using the CM-18 calibration module. See the Calibration Module Help page.
Should the sensor be installed horizontally or vertically?
Horizontal installation is recommended. Vertical installation can allow air bubbles to collect around the electrodes, causing unstable or inaccurate readings.
Can the CS10S be stored dry?
Yes. The CS10S can be stored wet or dry. No special conditioning is required before use. Simply install, wire, and allow several minutes for the reading to stabilize.
CTS1 Conductivity / Temperature Sensor
Conductivity and temperature sensor for 414C conductivity monitors and 414TDS monitors. Noryl plastic body with 316 stainless steel electrodes and integrated thermistor network.
CTS1 Installation
CTS1 Wiring
| Wire Color | Function | Terminal |
|---|---|---|
| White | Electrode | TB1-7 |
| Black | Electrode | TB1-8 |
| Shield | System Ground | TB1-9 |
| Red | Temperature | TB1-10 |
| Green | Temperature | TB1-11 |
The CTS1 uses two electrodes with no inner/outer distinction — black and white are interchangeable. Refer to the 414C or 414TDS User Manual for the complete wiring diagram.
How the CTS1 Works
- Measures conductivity using 316 stainless steel electrodes with a cell constant of 1.06, displayed as µS/cm on 414C or ppm TDS on 414TDS.
- Integrated thermistor network provides automatic temperature compensation to 25°C by the monitor.
- Designed for continuous-flow applications where the sensor remains submerged during operation.
CTS1 FAQ
Can the CTS1 be used with both the 414C and 414TDS?
Yes. The CTS1 works with both models. The 414C displays conductivity in µS/cm and the 414TDS displays total dissolved solids in ppm. The same sensor, different monitor displays.
Does the CTS1 require calibration?
No. The CTS1 sensor does not require calibration. Calibration is performed on the 414C or 414TDS monitor using the CM-1K calibration module. See the Calibration Module Help page.
Can I use a different conductivity sensor with the 414C or 414TDS?
No. The 414C and 414TDS are designed exclusively for the Hydro-Check CTS1 sensor. Other sensors have different cell constants and will not produce correct readings.
Can the CTS1 be stored dry?
Yes. The CTS1 can be stored wet or dry. No special conditioning is required before use. Simply install, wire, and allow several minutes for the reading to stabilize.
Sensor Testing (Quick Verification)
Use a multimeter to verify sensor health before or after installation. These tests apply to both the CS10S and CTS1.
Measure resistance across the red and green wires using a multimeter set to ohms (Ω).
| Temperature | Typical Resistance |
|---|---|
| ~0°C | ~28.6 kΩ |
| ~20°C | ~15.8 kΩ |
| ~25°C | ~13.5 kΩ |
| ~30°C | ~12.0 kΩ |
| ~45°C | ~8.3 kΩ |
- Values do not need to be exact — ±5–10% variation is normal.
- Resistance should decrease as temperature increases.
- A reading of 0 Ω or OL indicates a faulty temperature sensor.
Check continuity from each electrode wire to its respective electrode using a multimeter.
- Check continuity from white wire to electrode — should not read open (OL).
- Check continuity from black wire to electrode — should not read open (OL).
- White and black wires should not be shorted together (near 0 Ω between them indicates a fault).
- For CS10S: white = outer electrode (body), black = inner electrode.
- For CTS1: both electrodes are equivalent — no inner/outer distinction.
Storage & Maintenance
Both the CS10S and CTS1 sensors are designed for long service life with minimal maintenance.
- Can be stored wet or dry
- No special conditioning required
- Keep in a clean, dry environment when not in use
- Periodic visual inspection recommended
- Check for biofilm buildup in bio-prone systems
- Inspect cable and connections for damage
If sensor electrodes become contaminated or coated:
- Clean electrodes with a glassware cleaner, hydrogen peroxide, bleach, or ~4% HCl solution.
- Gently scrub with a soft brush, tissue, or pipe cleaner — do not use abrasive materials.
- Rinse thoroughly with high-purity water after cleaning before reinstalling.
Sensor Troubleshooting
Unstable or fluctuating readings
If the reading is not stable:
- Check for air bubbles — Air trapped around the electrodes will cause fluctuating readings. Verify horizontal orientation and continuous flow.
- Ensure full submersion — The sensor must be fully submerged in moving water. Stagnant pockets or partial exposure will cause instability.
- Inspect for contamination — Biofilm, scale, or debris on the electrodes can interfere with readings. Clean the sensor using the procedure above.
- Check wiring connections — Verify all connections at TB1 terminals 7–11 are secure and properly seated.
Display shows "OL" or no reading
"OL" typically indicates an open circuit:
- Check all connections at TB1 terminals 7–11 — Loose or disconnected wires will cause an OL reading.
- Verify correct terminal positions — Each wire must be connected to the correct terminal per the wiring table.
- Inspect cable for damage — Check the entire cable run for cuts, breaks, or pinched wires. Test continuity with a multimeter.
- Ensure sensor is submerged — A dry sensor or one with significant air exposure will not produce a reading.
- Contact support — If OL persists with verified wiring and submersion, the sensor or monitor may need service. Contact orders@hydrocheck.com.
Slow response to changes in water quality
If the reading responds slowly to known changes:
- Allow stabilization time — The 414 monitors continuously average readings. Allow several minutes for the display to reflect changes.
- Verify flow rate — Slow or intermittent flow extends response time. Ensure continuous flow past the sensor.
- Check for contamination — Coated electrodes slow response. Clean the sensor if buildup is visible.
- Check sensor orientation — Vertical installation may trap air, creating a dead zone around the electrodes.
Incorrect or out-of-range readings
If the reading does not match expected water quality:
- Verify the correct sensor is installed — CS10S for 414R, CTS1 for 414C/414TDS. Do not mix sensors and monitors.
- Check wiring against the color code — Reversed or misconnected wires will produce incorrect readings.
- Verify calibration — Use the appropriate calibration module (CM-18 for 414R, CM-1K for 414C/414TDS) to verify. See the Calibration Module Help page.
- Inspect for contamination — Heavy contamination on the electrodes can shift readings. Clean and retest.
- Verify correct cell constant — CS10S = 0.05, CTS1 = 1.06. Using the wrong sensor with the wrong monitor will produce incorrect readings.
- Check for electrical interference — Route the sensor cable away from high-voltage lines, motors, and VFDs.
Manuals & Instructions
Sensor installation and wiring details are included in each monitor's user manual.
Documentation
Certificate of Conformance
General Certificates
Download standard Certificates of Conformance for sensors.
CS10S Resistivity Sensor
Standard compliance documentation for the 414R resistivity sensor family.
Download PDFCTS1 Conductivity Sensor
Standard compliance documentation for the 414C or 414TDS sensor family.
Download PDFTraceability Lookup
Enter the lot number exactly as printed on the sensor label to retrieve traceability data.
Format guide: CS10S-Bxx-yymmdd.