2. Product Overview
HMP4, HMP5, HMP7, and HMP8 are humidity and temperature measurement probes with a
digital (Modbus) output. TMP1 is a temperature-only version. The probes are designed for
demanding humidity and temperature measurement applications. Each probe model has a
different probe head, but the same probe body and a 2 m (6.5 ft) cable between the probe
body and the probe head.
The probes are compatible with Vaisala Indigo™ transmitters. They can also be connected to
Vaisala Insight software for configuration, diagnostics, and temporary online monitoring.
2.1 Probe Structure
2
1
3
4
5
6
7
8
Figure 1 Probe Parts
1
Protection cap (remove before use)
2
5-pin M12 connector
3
Probe body with type label
4
Status indicator:
Green
Power on and probe online,
flashes when communicating
Red
Error
Off
Power off or indicator
disabled
5
Probe cable. Do not cut.
6
Probe head (HMP7 model shown)
7
Sensor(s) under protective filter
8
Protection cap (remove before use)
2.2 Basic Features and Options
• Comprehensive list
of output parameters:
Relative humidity, temperature, delta-T, dew point temperature, frost point temperature,
wet-bulb temperature, absolute humidity, mixing ratio, vapor pressure, saturation vapor
pressure, enthalpy
• Temperature measurement range -70 ... +180 °C (-94 ... +356 °F)
1)
Humidity measurement parameters available on HMP models only
Chapter 2 – Product Overview
7
