Network Meter Block Installation, Operation, & Maintenance Manual
Maintenance 41
5 Maintenance
Very little maintenance is required for the NMB. The only user-serviceable items on the NMB are the
battery and the pluggable connectors.
5.1 Replacing the Clock Battery
The NMB has a battery that powers a real-time clock used for time stamping log entries. The life of the
battery can vary due to operating conditions, particularly the amount of time the NMB is left in a powered-
off state.
When the NMB is in service, it is recommended that the battery be replaced at a minimum of 5-year
intervals. If the NMB has been powered down for extended periods, it is recommended to replace the
battery prior to putting the NMB back in service.
The following items are needed when replacing the NMB’s battery:
• A new CR1220 coin cell battery
• A P1 Phillips head screwdriver
To replace the NMB’s battery, complete the following steps (see photo in Figure 18: DIP Switches for
reference):
1. Remove the NMB’s power supply.
2. Ensure the area you are working in is non-hazardous (safe from combustible gases).
3. Open the instrument housing (if equipped).
4. Unplug the three pluggable connectors and ETH1 and ETH2. Make sure that cables are marked so
they can easily be correctly reconnected.
5. Remove the NMB from its instrument housing or mounting position.
6. On the back of the NMB, loosen the three screws until you can easily lift off the back cover.
7. Remove the battery from its holder and replace it with the new battery (see the list of acceptable
replacement batteries above).
All fuses on the NMB are soldered onto the PC board and are thus not replaceable.
The NMB must be removed from its explosion-proof instrument housing (if equipped) or its mounted
position to replace the battery.
It is imperative that the battery replacement is done in a safe area or an area that is known to be non-
hazardous.
The battery must be manufactured by Panasonic, Maxell, Varta, or Renata, or supplied directly from
TechnipFMC (part number P8000017080). To maintain Ex certifications, substitutions are not
allowed.
To Next Page
Loading...
Need help?
General
