The Inventia MT-703 GSM module user manual provides design, connection, configuration, and troubleshooting information for the telemetry device.
The MT-703 (and MT-703 HC) is a compact telemetry module optimized for low‑energy operation in water‑sewage and level‑monitoring applications. It supports binary and analog inputs, internal logging, and GPRS/SMS communication with configurable SIM cards.
The manual covers module designation, GSM requirements, hardware design, wiring diagrams, configuration parameters, troubleshooting steps, technical specifications, safety information, and appendices with change logs, memory maps, and housing drawings.
| Dimensions (H × W × D) | 122 × 120 × 65 mm |
|---|---|
| Weight (incl. batteries) | 1030 g |
| Operating temperature | -200 °C to +500 °C |
| IP rating | IP67 (option IP68) |
| GSM transmitter frequency (EGSM 900) | 880 MHz – 915 MHz |
| Analog sensor output voltage | 3.3 V |
| Binary input contact voltage | 2.5 V |
| Analog input measuring range | 0 – 3.3 V |
| Analog input resolution | 10 bits |
| Maximum logger records | 288 |
The module provides two general‑purpose binary inputs (I1, I2) and one auxiliary input (I3) for the cover sensor.
The device can operate from –200 °C up to +500 °C.
It is powered by three or six R20 alkaline batteries providing 4.5 V.