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Chapter 3 _______________________________________________________________ Installation

VAISALA _______________________________________________________________________ 23

Power Supply Requirements

The operating voltage for the HMP60 and HMP110 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 RS485 interface will also

increase current consumption from the average value. More frequent

interrogation than once per second is not recommended.

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Vaisala HMP110 Guida Utente Pagina 25