Vaisala HMP4 - Installation

Installation
When you choose the installation location for the probe, consider the following:
• Verify the operating environment specification of the probe model. The probe head
typically has a much wider operating temperature range than the probe body.
• If the temperature of the measured environment diers greatly from ambient
temperature, the entire probe head and preferably plenty of cable must be inside the
measured environment. This prevents measurement inaccuracy caused by heat
conduction along the cable.
• Probe mounting options are model-specific.
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Figure 2 Example Installation of HMP8 Model
1
Mount the probe head horizontally to prevent any water condensing on the probe head
from running to the sensors.
2 Let the cable hang loosely to prevent condensed water from running along the cable to
the probe head.
3 Attach the probe body to a wall or other surface using the two mounting clips (Vaisala
item 243257SP) supplied with the probe. Each clip attaches to the installation surface with
one screw (screw hole Ø 4.2 mm).
4 Cable to Modbus master or Indigo transmitter.
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ENGLISH