Dwyer SCL1090 - Manual (Page 6)

December, 2004 Page 6 of 8 949-0529 Rev. 2
ALARM CALIBRATION
NOTE: Allow the module and socket to come to stable
temperature before proceeding. For best results, allow
the module to be powered in the socket for at least 20
minutes.
1. Apply the appropriate input for the desired
alarm trip point.
2. Adjust the alarm AL screw for relay trip (LED
changes color).
3. Adjust the alarm DB screw to the full clock-
wise position. Change the input to the desired
reset point. Slowly turn the alarm DB screw
counter-clockwise until the relay resets (Alarm
LED changes back to original color).
4. Move the input back to the desired trip point to
confirm correct setting.
5. Move the input to the reset point to confirm
correct setting.
6. Repeat as necessary.
AL
DB
RESET
7
10
8
11
9
12
B
A
1234567
8
ON
1234 ON
12345678 ON
OPERATION
On power up the module will automatically reset the alarms provided
that no alarm condition exists. It may be necessary to reset a low
alarm after the process has reached normal conditions.
When the input is within set limits, both LED indicators will be green
and the relay contacts will be in the state programmed for normal op-
eration. If the input reaches either of the trip points, the relay con-
nected to that trip point will change state and the LED connected to
that point will indicate red.
When the input returns to normal (trip point plus dead band for low
alarm settings, trip point less dead band for high alarm settings) and
switch 4 of SW 2 is set to NON-LATCHING, the relay and LED will
automatically return to the non-alarm condition. If switch 4 of SW 2 is
set to latching, the red RESET button on the top of the module must be
pressed to return the relay and LED to the non-alarm condition.