MDT
Submersible Data Transceiver
Standard, MAX and LoRaWAN® Systems
Product Overview
Our IP68-rated Submersible MDT pairs a MAX-Range-class radio board with a fully epoxy-potted enclosure and sealed lithium battery for true waterproof operation exceeding ten years.
The unit is offered in three radio families—Standard, MAX and LoRaWAN®. Each can be ordered with a single pulse input (code S-P) or a single Sensus/Neptune encoder input (S-E). All versions include an internal temperature sensor. Meter leads are spliced to the MDT’s pre-attached wires using waterproof IDC connectors. A built-in LED shows status; a magnet swipe on the case replaces the push-button of our regular MDTs for test transmissions and link-quality queries.
For pit installations, mount the housing upside-down to the underside of a plastic pit lid using the screw tabs or waterproof adhesive. This places the antenna in an air pocket near the surface for optimal range.
Specifications
| Specification | Details |
|---|---|
| Input Options | • S-P – pulse input (water, gas, electric, BTU, runtime) • S-E – Sensus/Neptune encoded protocol • All variants include internal temperature sensor |
| Data Resolution | 1-hour interval |
| Radio | 902 – 928 MHz; FCC/IC certified Open-field ≈ 2 mi (Standard) Open-field ≈ 10 mi (MAX & LoRaWAN) * |
| LED | Indicates power and RF-link status |
| Operating Environment | -20 ° to 145 °F; IP68 (fully submersible) |
| Power | Sealed 3.6 V primary lithium cell |
| Typical Battery Life | 10 + years @ 50 – 90 °F (reduced at extremes) |
| Dimensions | 6.2″ × 2.4″ × 1.5″ |
| Warranty | Five years (batteries excluded). See our warranty page. |
Continual product enhancements may cause specifications to change without notice.
*Actual range varies with installation and topography.
Models
| Standard System | Model # | Description |
|---|---|---|
| Submersible MDT, Pulse | TW-167S-P | Single pulse input, 1-h data, includes temperature |
| Submersible MDT, Encoder | TW-167S-E | Single Sensus/Neptune input, 1-h data, includes temperature |
| MAX System | Model # | Description |
| Submersible MDT, Pulse | TW-177S-P | Single pulse input, 1-h data, MAX network, includes temperature |
| Submersible MDT, Encoder | TW-177S-E | Single Sensus/Neptune input, 1-h data, MAX network, includes temperature |
| LoRaWAN® System | Model # | Description |
| Submersible MDT, Pulse | TW-187S-P | Single pulse input, 1-h data, LoRaWAN network, includes temperature |
| Submersible MDT, Encoder | TW-187S-E | Single Sensus/Neptune input, 1-h data, LoRaWAN network, includes temperature |
* Adequate repeater / gateway coverage is required for guaranteed delivery.
Note: Standard, MAX and LoRaWAN systems are NOT compatible.
Refer to AN-119 for additional information.
Pulse Wiring
TW-167/177/187 S-P Submersible MDTs
These MDTs have pre-attached wires; splice to the meter leads with waterproof IDC connectors. For pit use, seal the splice inside a grease-filled pod.
Encoder Wiring
TW-167/177/187 S-E Submersible MDTs
Wiring procedure is identical to the pulse version; splice colour-coded leads with waterproof connectors and seal if submerged.
Operation
Swipe a magnet over the marked areas to mimic a button press for test transmission or link-status query; the LED provides the same green/amber/red feedback as regular MDTs.
