Vaisala HMP230 Manuel d'utilisateur télécharger pdf (Page 10)

HMP230 SERIES

User's Guide M210225en-B

3. INSTALLATION

3.1. Selecting the place of installation

Choose a place which gives a true picture of the environment or process, and

is as clean as possible. Air should circulate freely around the sensor. A rapid

air flow is recommended; it ensures that the sensor head and the ambient air

are at the same temperature.

Install the transmitter in a place where no cold or hot spot can develop. When

the sensor head is installed in a duct or process channel where the temperature

is different from the ambient temperature, insulate the point of entry; this is

particularly important if the transmitter is installed with the sensor head

pointing downwards. Installing the sensor head of the HMP233, HMP234 and

HMP235 vertically is not recommended. An uninsulated installation could

lead to condensation in the sensor head and even when no condensation oc-

curs, the resultant air flow may change the temperature near the sensor and

distort the readings.

Install the sensor head in the process wherever possible; avoid sample flows

where the gas temperature can drop below dewpoint temperature. Install the

sensor head transversely against the direction of the process flow.

In duct or channel installations drill a hole ready for a reference meter. Plug

the reference hole tightly.

Install the electronics housing away from possible steams escaping from the

process.

NOTE

To ensure an IP 65 class protection:

1. Always mount the transmitter housing with the cable

bushings pointing downwards.

2. Make sure that the connection cable has the right

thickness (∅ 7...10 mm) and that the cable bushing

is carefully tightened.

3. Pay always special attention to closing the

transmitter cover carefully and remember to tighten

all four screws.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 162 163

Pas de commentaire

Vaisala HMP230 Manuel d'utilisateur Page 10