Level Sensors
Sensor Installation
Mechanical mounting, cable routing, submersion installation, and commissioning of HPzenAi LS-PRE pressure level sensors.
Installation Video Guide
Watch the complete installation walkthrough before starting. The video covers tank preparation, sensor submersion, cable routing, vented cable handling, RS485 wiring to the gateway, and app commissioning.
Tools Required
Gather these tools before starting. Installation is straightforward and requires no specialist equipment.
Tool Checklist
| Preview | Quantity | Item | Details |
|---|---|---|---|
| × 1 | Flat-Head Screwdriver | For tightening RS485 terminal block connections at the gateway | |
| × 1 | Wire Strippers | To prepare the sensor cable ends before insertion into terminals | |
| × 1 | Cable Suspension Clamp | To secure the sensor cable at the top of the tank and bear the sensor weight — not the cable itself | |
| × 1 | Weatherproof Cable Gland (PG13.5 or M20) | For routing the cable through the tank wall, lid, or access cover | |
| As required | RS485 Shielded Twisted-Pair Cable | For extending the sensor RS485 connection to the gateway if the sensor cable is not long enough | |
| × 1 | Multimeter | To verify 12V DC supply voltage and cable continuity before powering on |
Flat-Head Screwdriver
For tightening RS485 terminal block connections at the gateway
Wire Strippers
To prepare the sensor cable ends before insertion into terminals
Cable Suspension Clamp
To secure the sensor cable at the top of the tank and bear the sensor weight — not the cable itself
Weatherproof Cable Gland (PG13.5 or M20)
For routing the cable through the tank wall, lid, or access cover
RS485 Shielded Twisted-Pair Cable
For extending the sensor RS485 connection to the gateway if the sensor cable is not long enough
Multimeter
To verify 12V DC supply voltage and cable continuity before powering on
What's in the Box
Verify all items are present before beginning installation. Contact support if anything is missing or damaged.
Included Items
| Preview | Quantity | Item | Details |
|---|---|---|---|
| × 1 | LS-PRE Level Sensor | Submersible stainless-steel sensor body with pre-attached vented 3-core cable (10 m standard) | |
| × 1 | Cable Suspension Clamp | Stainless-steel clamp to secure the sensor cable at the tank entry point | |
| × 1 | Quick-Start Installation Guide | Printed reference card for sensor installation, RS485 wiring, and app setup |
LS-PRE Level Sensor
Submersible stainless-steel sensor body with pre-attached vented 3-core cable (10 m standard)
Cable Suspension Clamp
Stainless-steel clamp to secure the sensor cable at the tank entry point
Quick-Start Installation Guide
Printed reference card for sensor installation, RS485 wiring, and app setup
Sensor Submersion Installation
The LS-PRE sensor must be installed at the bottom of the tank or water body so that the full water column above it creates the measurable pressure. Incorrect submersion depth or allowing the sensor to rest on sediment will result in inaccurate readings.
Steps
- Select an installation point on the tank lid, side wall, or access cover through which the cable can be routed with a weatherproof gland.
- Install the cable suspension clamp at the tank entry point — the sensor weight is borne by the clamp, not by the cable itself.
- Lower the sensor body to the bottom of the tank, leaving 50–100 mm clearance above the tank floor to avoid sediment contact.
- Secure the cable to the suspension clamp so there is no strain on the cable jacket below the clamp.
- Route the cable through the weatherproof cable gland and tighten the gland to seal around the cable.
- Keep the vent end of the cable (the free end exiting the tank) in a dry, non-submerged location at all times — do not seal or kink the vent tube.
- Ensure the cable has a gentle drip loop on the outside of the tank before entering the junction box or gateway enclosure to prevent water ingress.
RS485 Wiring to Gateway
Connect the sensor cable to the gateway RS485 terminal block. The sensor cable uses a 3-wire configuration: 12V DC power, RS485 A, and RS485 B. Refer to the colour coding on the cable label or the quick-start guide for your sensor batch.
Steps
- Strip 8–10 mm of insulation from each wire at the end of the sensor cable.
- Connect the 12V DC power wire to the +12V terminal on the gateway power output or a separate 12V supply.
- Connect RS485 A wire to the RS485 A terminal on the gateway.
- Connect RS485 B wire to the RS485 B terminal on the gateway.
- Tighten all terminal screws firmly — a loose connection is the most common cause of intermittent readings.
- If multiple sensors are connected, daisy-chain the A terminals together and the B terminals together (do not star-wire).
- Verify the total RS485 cable run from gateway to the furthest sensor does not exceed 100 m for reliable operation.
Final Inspection Checklist
Complete this checklist before powering on and linking the sensor in the app.
Steps
- Sensor body fully submerged at the bottom of the tank with 50–100 mm floor clearance.
- Cable suspended from the clamp — no strain on cable below the clamp.
- Vent end of cable is in a dry, open-air location — not sealed, kinked, or submerged.
- Cable routed through a weatherproof gland — gland tightened securely.
- RS485 A and B wires connected to correct terminals at the gateway.
- 12V DC power connected and verified with multimeter.
- All terminal screws tightened.
- Cable drip loop formed on exterior before gateway enclosure entry.
Important Installation Notes
Follow these precautions during installation and whenever the sensor is serviced.
Steps
- Never seal, crimp, or kink the vent tube — blocking atmospheric compensation causes permanent reading errors.
- Do not allow the sensor to rest on tank sediment — sediment contact causes false high readings and may block the pressure port.
- Protect the cable from abrasion where it contacts tank edges or walls — use a cable sleeve or rubber grommet.
- When extending the sensor cable with RS485 cable, use shielded twisted-pair and join in a weatherproof junction box — do not use open wire nuts exposed to moisture.
- Confirm the sensor range (2M/4M/6M/8M/10M) is equal to or greater than the maximum water depth in the tank — do not operate a sensor above its rated range.