Vaisala HMP Series, User Manual

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If purchased with a composite sensor instead of the field replaceable HUMICAP â R2 sensor,
HMP3 can use the chemical purge feature. In environments with high concentrations of
chemicals and cleaning agents, the chemical purge option helps to maintain measurement
accuracy between calibration intervals.
More information
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Mounting probe head inside DTR502B (page 38)
4.5 HMP4 probe
136 [5.35]
Probe cable 2 m [6.56 ft]
Ø 25 [0.98] M12/5
183 [7.20]
120 [4.72]
41 [1.61]
Ø 5 [0.2]
Fitting body NPT1/2” or M22×1.5
with sealing ring Ø22×27×1.5 Cu
Ø 12 [0.47]
32 mm 27 mm
mm
[in]
Figure 8 HMP4 probe dimensions
Vaisala HUMICAP â Humidity and Temperature Probe HMP4 is designed for high-pressure
applications such as compressed air systems in maritime, breathing air, and industrial
applications, where measurement performance and chemical tolerance are essential.
• Temperature measurement range −70 … +180 °C (−94 … +356 °F)
• Operating pressure 0 … 10 MPa (0 … 100 bar)
• Operating temperature for probe body −40 … +80 °C (−40 … +176 °F)
• M22×1.5 or NPT1/2” fitting body
Use a sealing ring (Ø22×27×1.5 Cu) with the M22×1.5 fitting. Replace the sealing
ring every time the probe is detached. Three sealing rings are supplied with the
fitting.
Chapter 4 – Installation
25