KROHNE BM 700 EN - Manual (Page 16)

Page 16 BM 700 Installation and Operating Instructions
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 “flame-
proof enclosure“ (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 re-
pair work) or the terminal compartment (e.g. to connect or disconnect cables) or
replacing the signal converter in hazardous locations, make sure:
- that the BM 700 Level-Radar has been disconnected from supply,
- before opening the flameproof enclosure 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 the parameters of the BM 700 and switch off the power
supply!
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.
3. Remove the 4 Allen screws M (Allen key size 5 mm) and lift off the signal conver-
ter. The flange unit (incl. waveguide window) will remain tight even with pressu-
rized tanks.
Caution
On pressurized tanks, do not on any account remove the 4 screws H connecting the
wave guide window to the BM 700 flange! DANGER!
4. Fit the new BM 700 converter.
5. Reconnect all cables in the terminal
compartment, as described in Section 3.
6. Check against the enclosed report on
settings whether the factory-set parameters
are correct for your application. If not, reset.
7. 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 BM 700
The party returning a device is obligated to check and ensure that all cavities in the
device are free from dangerous substances (toxic, caustic, flammable, water-
endangering), and that a certificate is enclosed with the device confirming that it is
safe to handle.
distance piece
(for hightemperature
version up to 250°C (482°F)
O-ring
BM70
connecting flange
signal converter
M
H