Vaisala HMP4 - Product Overview; Probe Structure; Basic Features and Options

Product Overview
HMP series probes are humidity and temperature measurement probes with a digital output
(Modbus protocol). The probes are designed for demanding humidity and temperature
measurement applications. Each probe model has 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.
Probe Structure
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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
O Power o or indicator
disabled
5 Probe cable (do not cut)
6 Probe head (HMP7 model shown)
7 Location of sensors on the probe head.
HMP4, HMP5, HMP7, and HMP8 models
have a removable filter over the
sensors that can be replaced if it gets
dirty or damaged.
8 Protection cap (remove before use)
Basic Features and Options
• Comprehensive list of output parameters. For example: relative humidity, temperature,
dew point temperature, wet-bulb temperature, absolute humidity, mixing ratio, water
vapor pressure, enthalpy. Humidity parameters available only on HMP models.
• Sensor purge provides superior chemical resistance (HMP models only)
• Probe and sensor warming functions minimize condensation on probe (HMP models only)
• Traceable calibration certificate:
• HMP models: 5 points for humidity, 1 point for temperature
• TMP1: 2 points for temperature
• Standalone Modbus RTU over RS-485
• Plug & play compatible with Indigo series of transmitters
• Can be connected to Vaisala Insight PC software for configuration, diagnostics, and
temporary online monitoring
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