Power supply requirements, Recommendations – Vaisala HMP110 User Manual
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User's Guide ______________________________________________________________________
28 __________________________________________________________________ M211060EN-E
Power Supply Requirements
The operating voltage for the HMP60 and HMP110 series probes must be
in the following range:
- 5 ... 28 VDC when using the 0 ... 1 V, 0 ... 2.5 V or RS-485 output
- 8 ... 28 VDC when using the 0 ... 5 V or 1 ... 5 V output
Current consumption is 1 mA on average, which makes the probes well
suited for running on battery power. The maximum peak consumption is
5 mA.
Recommendations
- Continuous use over high operating voltage may cause heating.
To conserve power and minimize the warming of the probe, use the
lowest operating voltage in the allowed range.
- Using low impedance loads on the signal outputs increase the current
consuption by up to 0.5 mA. High impedance loads are recommended
to minimize warming of the probe.
- Frequent interrogation of the probe using the RS-485 interface will
also increase current consumption from the average value. More
frequent interrogation than once per second is not recommended.