Vaisala HMP260 SERIES Instrukcja Obsługi Pobierz pdf (Strona 17)

HMP260 SERIES

HMP260-U017en-1.5 Operating Manual

1997-11-25 11

a plugged hole

for an Exi-approved

reference meter

HAZARDOUS AREA

SAFE AREA

Fig. 3.7 Mounting the sensor head on a duct or channel

When the sensor head is installed in a duct or a channel, the temperature

difference of the air inside and outside the duct must be small as the sensor

head conducts heat.

3.3. Grounding

A single electrical cable with a screen and three to ten wires is recommended

for power and analogue output/serial bus connections. The cable diameter

should be 7...10 mm.

The screen of the electrical cable must be grounded properly to achieve best

possible EMC performance. Recommended cable shield is done in the cable

gland as shown below.

• remove the brass disks, rubber ring and nut from the transmitter

housing

• strip 165 mm of the cable insulation, but leave 25 mm of the braid

visible

• slip the nut and rubber ring over the cable insulation

• slip the brass disk that has the bigger hole in it over the braid so that

it rests against the cable insulation

• slip the other brass disk over the wires to the middle of the braid

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Vaisala HMP260 SERIES Instrukcja Obsługi Strona 17