The EFQS-HM180 uses a sealed mercury switch inside a welded stainless steel float. As liquid level changes, the float tilts and the mercury moves to make or break the signal contacts. Its approximately ±10° operating angle supports sensitive level indication in heated tanks and compatible process-liquid systems.
The EFQS-HM180-A10 configuration operates at a maximum of 20VAC/DC and 0.5A. Use it for sensing and indication with a compatible receiving circuit. Select the stainless steel grade for the actual liquid, concentration and temperature.
| Parameter | Specification |
|---|---|
| Contact element | Mercury tilt switch |
| Maximum voltage | 20VAC/DC |
| Maximum current | 0.5A |
| Working temperature | 0–180°C |
| Housing material | SUS304 stainless steel; SUS316 option |
| Cable construction | 0.75mm² tinned copper conductors with silicone insulation |
| Cable lengths | 2m, 3m, 4m, 5m or 10m; customizable |
| Switching angles | Approximately −10° and +10°, with ±2° tolerance |
| Float-body density | 0.69g/cm³ |
| Level differential | Greater than 0.3m |
| Pressure resistance | 1MPa; confirm the permissible operating pressure for the supplied assembly |
| Protection | IP68 |
| Float dimensions | Ø75×123mm |
| Counterweight dimensions | Ø52×60mm |
| Conductor | Function |
|---|---|
| Black or yellow-green | Switching common; verify identification on the supplied assembly |
| Blue | Lower-level signal; closes to common when the float tilts downward to −10° |
| Brown | Upper-level signal; closes to common when the float tilts upward to +10° |
Between −10° and +10°, the switch retains its previous state. Isolate power before wiring and confirm conductor functions. A switching common must not be mistaken for protective earth. Insulate unused wires and keep cable joints dry.
Pass the cable through the counterweight, adjust the position for the desired level indication and tighten its fixing screw after checking both switching points. Leave room for free float movement and prevent the cable from rubbing against sharp edges. Confirm the permissible pressure of the supplied assembly for the installation.
Inspect the housing, cable and weld regularly. Stop using the instrument if its housing is deformed, the weld leaks or insulation is damaged. The contact element contains metallic mercury; handle the product under hazardous-waste procedures at end of life and do not discard it with ordinary waste.
