Max Machinery 294_269 High Resolution, Linearized Frequency Transmitters - Manual (Page 7)

7
Rotation/Output Indicators
The red/green rotational indicating LED (D2) will be illuminated when the circuit has power. One side
will always be lit. The color will depend on where the meter stops in its rotation. The yellow signal
LED’s illuminate only when the sensor output is “high”.
Note: There are no selections or adjustments to be made on the circuit board. The only method of
altering the setup parameters is through the Serial Interface Program. (see manual)
High temperature operation above 65°C (150°F)
The operating limit of the meter/transmitter is a function of both the ambient and the metered fluid
temperature, as shown in the graph below. Although the electronic components are rated to 80°C
(175°F), additional heat can be conducted from the flow meter into the transmitter housing requiring
a lower ambient temperature limit for high fluid temperatures.
To prolong the life of the transmitter and reduce the risk of component related failures over time,
high ambient temperatures >65°C (150°F) should be avoided if possible. It is a good idea to locate
the transmitter away from hot spots such as steam pipes, ovens and heaters. When working with
elevated fluid temperatures >65°C (150°F), insulating the flow meter is recommended to reduce the
risk of burns, and to reduce the heating of the electronics by convection of hot air off of the meter
(especially for larger meters). The upper temperature limits shown in the curves rely on ambient
convection to remove heat from the transmitter housing, cooling the electronics. For this reason,
if operating near the upper temperature limit, the transmitter should not be insulated. At these
elevated temperatures, the transmitter will be very hot – exercise appropriate caution.
Discontinued