Omega Engineering OS137 Manual de usuario descargar pdf (Pagina 11)

3.4 Alarm Setting

The unit provides 0-100% alarm setpoint adjustment. Here is an example

of an alarm setting:

• An OS137-3-MA (4/20 mA output), the alarm is to be set at 204°C

(400°F) temperature.

• Connect the alarm output as shown in Fig. 2-2.

• Remove the End Cap to get to the Alarm Switch and the Alarm Adjust

(Fig. 3-2).

• Set the Slide Switch on the main board to the Alarm position (2).

• Measure the analog output, and adjust the Alarm Potentiometer until

the output reads 10.4 mA which is 40% (204°C, 400°F) of the

temperature range -18 to 538°C, (0 to 1000°F)

40 x (20-4)

[10.4mA =

100

+ 4]

• Set the Alarm Slide Switch back to the Real Time position (1).

• If the temperature reading is below the alarm setpoint, the Alarm

Output stays low, otherwise it goes high (Alarm Condition).

• The Alarm Output can drive an external mechanical relay.

Operation

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Omega Engineering OS137 Manual de usuario Pagina 11