Replacing fuses in the monitor – ADS Environmental Services IETG FlowHawk QR 775012 A4 User Manual
Page 316
8-32 IETG FlowHawk Manual
The following section includes detailed instructions on replacing
fuses (when applicable) in FlowHawk monitors.
Replacing Fuses in the Monitor
Regulator boards (manufactured as of 2012) in FlowHawk monitors
have three fuses (p/n 508071, 508072, and 508073) that may be
replaced independently upon failure. Refer to the Troubleshooting
section beginning on page 8-38 to identify whether a fuse may be
the source of a particular problem that has arisen within the
FlowHawk system and, if so, which fuse may require replacement.
The 5-volt blue fuse corresponds to the sensors and can be blown
due to a shorted sensor. If this fuse is blown, the monitor cannot
detect the sensors. The 3.3-volt yellow fuse is associated with the
processor board. When blown, this fuse prevents the monitor from
logging data and performing successful communications. The red
(main input) fuse is related to the regulator board and rarely blows.
Note: If the troubleshooting procedures indicate that a
sensor may have shorted or a sensor may have shorted and
the 5-volt (blue) fuse on the power regulator in the monitor
corresponding to the sensor may have blown, do not
connect the potentially shorted sensor to another monitor
until confirming that the sensor is functional (i.e., not
shorted) using a voltmeter. Please contact the IETG
Service Centre for detailed instructions on determining
whether a sensor has shorted. If the sensor is shorted, it
also will blow the 5-volt fuse in the other monitor.
Since the fuses attach to the board on the inside of the power
regulator dome inside the monitor, access to and replacement of a
fuse first requires opening the monitor and removing the dome.
Replace a fuse(s) in the monitor in the following way:
1. Collect the data from the monitor (remotely or on-site) to limit
the risk of losing data once the battery is disconnected.
2. Remove the monitor from the hazardous area (i.e., at least 6.1
meters (20 ft) away from the manhole).