Warning: Do not use CA to fix a faulty probe. Replace the NTC (10k@25°C) probe first.
The quick-start guide shows a 2-point calibration (0% and 100%). The Advanced Manual reveals the 6-point linearization table (Parameters L-01 through L-06).
Why 6 points? The EMS 25 uses a conductive plastic potentiometer, which is inherently non-linear in the first and last 8% of travel. Elstat Ems 25 Advanced Manual
The Procedure:
| Terminal | Function | Advanced Tip |
| :--- | :--- | :--- |
| 1-2 | Power Supply (L-N) | Use a dedicated circuit. Do not share neutral with high-inductive loads without a filter. |
| 3-4 | Compressor Relay (NO) | For inductive loads (compressors >1HP), install an external contactor. The internal relay is rated for 16A resistive. |
| 5-6 | Defrost Relay (Heating) | If using electric defrost, ensure the relay switches the contactor coil, not the heater directly. |
| 7-8 | Evaporator Fan Relay | Fan delay parameters (FON / FOFF) rely on this connection. |
| 9-10 | Probe Input (Sonda) | Polarity matters for PTC probes. Red wire to terminal 9 (signal), black to 10 (ground). |
| 11-12 | Digital Input (Door) | Use volt-free contacts. Parameter i2P determines if NC (normally closed) or NO (normally open). | Safety:
For advanced accuracy:
The Elstat EMS 25 Advanced is an electrostatic discharge (ESD) tester/monitor designed to measure and control static electricity in electronics manufacturing and other sensitive environments. It’s aimed at quality-control engineers and ESD program managers who need reliable, repeatable ESD measurements and compliance verification. Warning: Do not use CA to fix a faulty probe
Even with correct parameters, physical sensor drift occurs. The Elstat Ems 25 offers an offset parameter (CA - Calibration).