HMP8 Relative Humidity and

Temperature Probe

For pressurized and vacuum processes

Features

• RH accuracy up to ±0.8 %RH

• Temperature accuracy up to

±0.1 °C (±0.18 °F)

• Operating pressure 0 … 4 MPa

(0 … 40 bar)

• Temperature measurement range

−70 … +180 °C (−94 … +356 °F)

• Sensor purge improves long-term

stability and chemical resistance

• Probe installation depth can be

freely adjusted and probe can be

hot-swapped from pressurized

pipelines with an optional ball

valve kit

• Modbusâ RTU over RS-485

• Compatible with Vaisala Indigo

products and Insight PC software

• Traceable calibration certificate:

6 points for humidity, 1 point for

temperature

Vaisala HUMICAPâ Humidity and Temperature Probe HMP8 is designed for

pressurized applications in compressed air systems, refrigerant dryers, and other

pressurized industrial applications, where easy insertion and removal of the probe and

adjustable installation depth into the pipeline are needed.

Proven Vaisala HUMICAPâ

performance

Vaisala is the original innovator of the

thin-film capacitive humidity

measurement technology, which has now

become the industry standard in

humidity measurement.

HUMICAPâ technology results from

Vaisala's 40-year experience in industrial

humidity measurement, providing the

best stability, fast response time, and low

hysteresis in a wide range of

applications.

Sensor purge minimizes

effects of contaminants

In environments with high

concentrations of chemicals and cleaning

agents, the sensor purge option helps to

maintain measurement accuracy

between calibration intervals.

Sensor purge involves heating the sensor

to remove harmful chemicals. The

function can be initiated manually or

programmed to occur at set intervals.

Flexible connectivity

The probe can be used as a standalone

digital Modbus RTU transmitter over an

RS-485 serial bus, and it can also be

connected to Indigo transmitters and the

Indigo80 handheld indicator. For easy-

to-use access to field calibration, device

analytics, and configuration functionality,

the probe can be connected to Vaisala

Insight software for Windowsâ. For more

information, see www.vaisala.com/

insight.

Vaisala Indigo product family

Indigo transmitters extend the

capabilities of Indigo-compatible

measurement probes. The transmitters

can display measurements on the spot as

well as transmit them to automation

systems through analog signals, digital

outputs, and relays. Cable length

between probe and transmitter can be

extended to up to 30 meters.

The Indigo80 handheld indicator is ideal

for spot-checking and process

monitoring, as well as for configuring,

troubleshooting, calibrating, and

adjusting the probe. For more

information, see www.vaisala.com/

indigo.