HMP240 series transmitter user's guide, introduces the characteristics and features of the transmitter, including installation, wiring, parameter settings, etc.
The HMP240 is a microprocessor‑based transmitter for measuring dewpoint temperature, especially in high humidity or rapidly changing conditions. It can be equipped with one or two sensor heads and offers analogue outputs, serial interfaces and optional display/keypad covers. The manual describes the product features, options such as additional temperature probes, filters, and cable lengths.
The guide covers installation, wiring, commissioning, command sets, calibration procedures for humidity and temperature, maintenance, technical data, and several appendices including serial command reference, wiring diagrams and re‑gaining procedures.
| Dewpoint measurement range | -40 °C to +100 °C |
|---|---|
| Analogue temperature output scaling | -20 °C to 460 °C corresponds to 0 V‑10 V |
| Power supply | 24 VAC |
| Number of analogue outputs | 2 |
| Serial interfaces | RS‑232C, RS‑485/422, digital current loop |
| Cable lengths | 2.5 m or 10 m |
The HMP240 can measure dewpoint from –40 °C up to +100 °C.
It can be scaled from –20 °C to 460 °C to produce a 0 V‑10 V signal.
The transmitter is powered from a 24 VAC supply.
The HMP240 supports RS‑232C, RS‑485/422, and a digital current loop module.