HPT-21L
Wireless Submersible Level Transmitter
The HPT-21L connects a stainless-steel immersion probe to a separate wall-mounted, battery-powered body. Wireless versions include 4G, NB-IoT, LoRa and LoRaWAN for liquid-level reporting.
- Measuring-span configuration
- 0–300 m
- Accuracy configuration
- ±0.5% FS
- Radio configurations
- 4G / NB-IoT / LoRa / LoRaWAN
Supplied by WKSENSOR. Ask us about pricing, availability and delivery.
Product overview
Wall-mounted transmitter body
The battery-powered body has two slotted fixing ears, an external antenna and a lower cable entry. A sealing gasket is fitted at the enclosure joint.
- Supply
- 3.6 V DC
- Battery
- Two ER34615 cells, 19,000 mAh each
Immersion probe and cable
The stainless-steel cylindrical probe has a black tapered cable boot and connects to the separate body through a cable. Cable lengths can be customised up to 300 m.
- Measuring span
- Selected spans within 0–300 m
- Medium temperature
- −20–60 °C configuration
Wireless reporting
Sampling and upload
Adjustable sampling and upload intervals.
Remote parameters
Platform commands configure supported parameters on selected versions.
Optional level alarms
High and low level settings with alarm data reporting.
Configuration and selection
- Level span
- Selected measurement spans within 0–300 m.
- Cable length
- Custom lengths up to 300 m. Specify the cable length separately from the selected measurement span.
- Measurement medium
- Liquids compatible with the probe contact material.
- Medium temperature
- Temperature range: −20–60 °C. Higher-temperature configurations can be requested.
- Radio version
- 4G, NB-IoT, LoRa or LoRaWAN; LwM2M on supported configurations.
Technical reference
Specifications and options
| Parameter | Specification or option |
|---|---|
| Model | HPT-21L |
| Measuring-span configuration | 0–300 m |
| Measurement medium | Compatible liquids |
| Accuracy configuration | ±0.5% FS |
| Radio configurations | 4G / NB-IoT / LoRa / LoRaWAN |
| Supply voltage | 3.6 V DC |
| Battery configuration | Two ER34615 cells, 19,000 mAh each |
| Sleep current | <30 µA |
| Ingress-protection configuration | IP67 |
| Protocol option | LwM2M; configuration dependent |
| Medium-temperature configuration | −20–60 °C |
| Cable-length option | Custom lengths up to 300 m |
| Brand | WKSENSOR |
| Product reference | HH-777246841286 |
Application scenarios
Urban well levels
Water-level monitoring in urban inspection wells with a separate immersion probe.
Rivers and reservoirs
Wireless water-level reporting for rivers, lakes and reservoirs.
