Specifications

MAINTENANCE and SERVICE
washers from the bracket. Remove the bracket, insulating disk and bottom
plate as a unit to minimize the spread of the heatsink compound.
Remove the (2) screws holding the lower section of the Detector Housing,
then slide the section along the cable and remove.
Remove the (2) screws holding the socket, thermistor and photodiode in
place, being careful not to lose the washers that are used as shims.
Grasp the socket and photodiode base while slowly rotating to separate the
photodiode from the housing. Some friction will be felt as an O-ring is used
around the photodiode as a seal.
PHOTODIODE INSTALLATION:
To replace the photodiode, carefully remove the diode from the green
socket, and replace with a new one. Before mounting the new diode, the
top cap of the enclosure should be temporarily removed and the (2) screws
holding the Reaction Chamber loosened about two turns. This allows air
which is trapped between the O-ring seals to escape when the diode is
inserted. It also maintains the position of the O-ring and window in the
upper compartment.
The new photodiode should be slowly inserted into the housing while
gradually rotating the body. This allows the O-ring to properly seat.
Continue replacing screws, washers, thermistors, etc., with the thicker shim
(washer) on the opposite side of the socket from the thermistor.
Replace the lower section of the housing, then the bottom cover, insulator
and bracket with the shoulder washers and screws.
Re-tighten the screws in the Reaction Chamber (upper section). Replace
the top cap and its screws.
To reinstall in the Analyzer Module, reverse the procedure for removal as
indicated above.
Photodiode
Ozone
Detector Mounting
Bracket
Photodiode Socket
A
ssembly
Thermistor
Assembly
Reaction
Chamber
Sapphire
Window
Exhaust
Sample
Rosemount Analytical µCEM Continuous Analyzer Transmitter 5-6