Ametek Land 4750-PM, Руководство пользователя

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6 - 3 User Guide
Particulate Measurement System 4750-PM
6.3.1 Extended Shutdown Periods (Plant Operation Cycle)
For instruments fitted with an optical shield – the instrument is powered OFF
for a temporary, extended shutdown period (or outage) as part of the regular
plant operation cycle, prepare the instrument as follows:
1) On the Standard menu select
SHUT | BLOC (see Section 5.2.6).
NOTES
Closing the shutter does not form a complete environmental
seal.
2) Switch OFF the purge blower.
3) Then power OFF the sensor.
On plant start-up or if the purge has been disconnected for a long period,
contamination will have built up around the shutter. In this case carry out the
cleaning procedure outlined above.
6.4 Changing the Fuse (Mains-powered Sensors only)
WARNING!
Hazardous voltages are still present when the fuse has failed.
Disconnect and isolate the instrument from the power supply.
Fuses must only be changed by a trained and competent person.
CAUTION!
There is a replaceable fuse in the sensor. The replacement fuse
must be of the correct type and rating (see Section 2.2).
If a replacement fuse fails immediately, contact AMETEK Land or
your local service representative.
Do NOT replace with a higher value fuse!
1) Switch OFF and isolate the instrument from power.
2) Referring to Fig. 3-2, loosen the 4 off screws securing the sensor
enclosure and open the hinged lid.
3) Referring to item 3, Fig. 4-2, remove the fuse holder using a flat-blade
screwdriver or coin.
4) Replace the mains fuse (with a fuse of the same type only), then re-
install the fuse holder.
5) Refit the enclosure lid and secure it using 4 off screws.
6) Restore and switch ON power.