MDT
Smart+ Data Transceiver
Standard, MAX and LoRaWAN® Systems
Product Overview
The Tehama Smart+ MDT, when connected to a SunSonic® Umeter®, delivers far richer usage data than pulse or encoded meters. Sampling flow many times a second, the Umeter® produces volumetric readings plus Smart Alerts such as slow-leak, no-usage-30-days, reverse flow and empty-pipe/tamper. Installation is truly plug-and-play—units, count factor and meter size are conveyed automatically to Tehama.
Through a two-way interface, the Smart+ MDT polls the Umeter® every two hours for reads and alert status. For urgent events (e.g., slow leak or tamper) the Umeter® wakes the MDT so it can relay the alert immediately to the Tehama cloud, which notifies maintenance staff by e-mail or mobile push.
Smart+ MDTs are offered in all Tehama radio families—Standard, MAX and the new LoRaWAN®—out-performing legacy 420 MHz utility systems. A Display-MDT format is also available.
Smart Alerts
Whenever an alert is triggered or cleared the MDT transmits the change instantly. Up to five e-mail recipients—and, soon, mobile-app users—can receive these notifications.
Each alert message includes:
- Property name
- Alert type
- Triggered / cleared state
- Time stamp
- Apartment & building
- MDT RadioID
Individual enable/disable is not yet supported.
Empty pipe / Tamper alarm
Triggered when the pipe is empty—also a tamper alarm for clamp meters.
No water usage in 30 days
Triggered after 30 consecutive days with no usage.
Suspected slow leak
Triggered after 24 h of continuous flow.
Reverse flow
Triggered when reverse flow is detected.
Maximum flow
Triggered immediately when flow reaches the meter’s nominal capacity (possible burst-pipe).
Low signal
Triggered if ultrasonic signal strength falls below threshold.
Low battery
Triggered if the meter battery is low (separate from MDT batteries).
Minimum water temperature
Freeze warning—triggered below 37 °F / 2.7 °C.
Maximum water temperature
Triggered above 140 °F.
Specifications
| Input | SunSonic® three-wire Smart+ interface |
| MDT Data Storage | Up to 5 time-stamped readings |
| Data Resolution | 2-hour meter reads Alerts sent immediately Static meter info weekly |
| Radio | 902 – 928 MHz; FCC/IC certified • Standard: open-field ≈ 1 mi • MAX: open-field ≈ 10 mi |
| LED | Shows power & RF link: Green = good • Amber = OK • Red/flash = poor/syncing |
| Operating Environment | -20 ° to 145 °F, ≤ 90 % RH, non-condensing |
| Power | Two AA lithium batteries |
| Typical Battery Life | 6-8 yrs @ 50–90 °F (reduced at extremes) |
| Dimensions | 4.3″ × 2.2″ × 1.2″ |
| Warranty | Five years (batteries excluded). See warranty page. |
Continual product enhancements may cause specifications to change without notice.
*Actual range may vary with installation location and topography.
Models
| Standard System | Model # | Description |
|---|---|---|
| MDT | TW-160B-U | Smart+ interface; 2-h data; no memory |
| Display MDT | TW-165B-U | Smart+ interface; 2-h data; no memory |
| MAX System | Model # | Description |
| MDT | TW-170B-U | Smart+ interface; 2-h data; no memory |
| Display MDT | TW-175B-U | Smart+ interface; 2-h data; no memory |
| LoRaWAN® System | Model # | Description |
| MDT | TW-180B-U | Smart+ interface; 2-h data; no memory |
| Display MDT | TW-185B-U | Smart+ interface; 2-h data; no memory |
MDT to Umeter® Wiring
TW-160/165/170/175/180/185 B-U (Umeter®)
