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BM 70 A Kurzanleitung
Seite: 15
4. Entwurf 03/97
5. Maintenance, error handling
Hazardous-duty systems
•
Within the scope of routine checks required to be carried out on systems operated
in hazardous areas (maintaining the system in good working order), the
“flameproof enclosure“ (large cover on signal converter) should also be visually
inspected for outward damage and signs of corrosion.
•
Before opening the “flameproof enclosure“ (e.g. to inspect the inside or for
repair work) or the terminal compartment (e.g. to connect or disconnect cables)
or replacing the signal converter (device “head“) in the hazardous location,
make sure:
- that the BM 70 A Level-Radar has been disconnected from supply and then
allow the prescribed waiting time of 10 minutes to elapse first,
- or that there is no explosion hazard (gas-free certificate!).
Replacement of the signal converter
Before commencing, note down the parameters of the BM 70 A and switch off power
source!
1. Detach safety lock at terminal compartment using Allen key (size 4 mm) and
unscrew cover from terminal compartment using the special wrench. If a sunshade
(option) is fitted, remove this first.
2. Disconnect all cables from the terminals in the terminal compartment.
1. Remove the 4 Allen screws M (Allen key
size 5 mm) and lift off the signal converter.
The flange unit (incl. waveguide window)
will remain tight even with pressurized
tanks.
Caution
On pressurized tanks, do not on any account
remove the 4 screws H connecting the wave
guide window to the BM 70 A flange!
DANGER!
4. Fit the new BM 70 A converter.
5. Check the power voltage (instrument nameplate).
6. Reconnect all cables in the terminal compartment, as described in Section 3.
7. Check against the enclosed report on settings whether the factory-set parameters
are correct for your application. If not, reset.
8. Record the empty spectrum, see Section 4.
Important: Make sure that the screw thread of the covers on the terminal and
electronic compartments is well greased at all times.
Returning a device
Devices that have been in contact with toxic, caustic, flammable or water-
endangering substances may only be returned provided a certificate is enclosed with
the device confirming that it is safe to handle. The party returning the device is
Distanzstück
(für Hochtemperatur-
Ausführung bis 250°C)
O-Ring
BM70
Anschlussflansch
Messumformer
M
H
