Type FF-
6 Maintenance
During maintenance, remember:
– The equipment must be maintained by a professional familiar with the safety requirements and risks.
– Only perform maintenance work described in these operating and installation instructions.
– When performing maintenance of any type, observe the respective safety and operation regulations.
DANGER
Electrical voltage
Electrocution hazard.
a) Disconnect the device from power supply.
b) Make sure that the equipment cannot be reconnected to mains unintentionally.
c) The device must be opened by trained staff only.
d) Regard correct mains voltage.
DANGER
Toxic, corrosive gases
The measuring gas led through the equipment can be hazardous when breathing or
touching it.
a) Check tightness of the measuring system before putting it into operation.
b) Take care that harmful gases are exhausted to a save place.
c) Before maintenance turn off the gas supply and make sure that it cannot be turned
on unintentionally.
d) Protect yourself during maintenance against toxic / corrosive gases. Use suitable pro-
tective equipment.
The devices work free of maintenance. In case of failure see the table in chapter
Troubleshooting
[> page 11].
The controllers are internally fused by Ø5x20 fuses. To replace the fuses, turn off the power supply (see chapter
Troubleshooting
[> page 11]). The fuses have to be replaced by the same type.
The following fuses are used:
Controller type
Quantity
Value
Dimensions
Part number
FF-19 and FF-HM-24
1
100 mA slow
Ø 5 x 20 mm
91 10 0000 44
FF-..-U and F-HM-230
2
32 mA slow
Ø 5 x 20 mm
91 10 0000 37
6.1 Replacement of fuses
Replacement of fuses at types FF-19 and FF-..-U
– Disconnect power supply and disassemble insert / open housing.
– Disassemble fuse cover; take fuse out.
– Insert new fuse and reassemble fuse cover.
– Insert FF-19 again / close housing
Replacement of fuses at types FF-HM
– Disconnect power supply.
– With a matching tool press the lashes on the sides away from the sides carefully. Take the front away from the housing.
– Below the upper PCB there are the fuses (one for the FF-HM-24, two for the FF-HM-230).
– Press the front against the housing for reassembling until it fits in.
10
Bühler Technologies GmbH
BE410002 ◦ 09/2017
