Chapter Four: Functional Overview
The [SETUP] Key
47
Heater
Ch 1
Heater OFF
This entry allows you to select whether the 670 instrument supplies power to a heated pressure
transducer. The Adjust knob toggles between ON and OFF. The purpose of displaying the
heater current is to indicate when the transducer has reached thermal equilibrium. The most
accurate readings are attained when the transducer is thermally stable.
You can configure the main pressure display screen to list the amount of power used when the
heater is turned ON. Refer to How To Display the Heater Current with the Pressure Reading,
page 81, to display the heater current along with the pressure reading in the main pressure display
screen. The amount of power is expressed as a percentage and ranges from 0 to 100%. When the
heater goes from OFF to ON, the percentage of power used is very high, close or equal to 100%.
Only a small percentage of power is used to maintain the desired temperature once the transducer
is warmed up. The maintenance value will vary with ambient temperature, and from one
transducer to another.
Note
Set the Heater entry OFF if:
1. You are not using a heated transducer.
2. You are using a 274 multiplexer. The 274 multiplexer supplies the
power to heat the transducers.
3. There is no transducer connected to the 670 unit.
For more information, refer to How To Display the Heater Current with the Pressure Reading,
page 81.
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