Teledyne 3190Z - Zirconium oxide trace oxygen analyzer - Manual (Page 28)

Operation Model 3190Z
Teledyne Analytical Instruments 20
1. Press the SET LO ALARM function button once.
2. Within 5 seconds press either the
Δ or ∇ button to raise or lower
the displayed value as required, until the display reads the
desired concentration.
4.4.3 Sensor Fail Alarm
Not active in this product.
4.5 Selecting a Fixed Range or Autoranging
The Model 3290 can operate in fixed high, fixed low, or auto-
ranging mode. To change modes:
1. Press and then release the SET HI RANGE and the SET LO
RANGE buttons simultaneously.
2. Within 5 seconds press either the
Δ or ∇ button until Auto, Lo,
or Hi displays on the LCD, as desired.
After about three seconds, the analyzer resumes monitoring in the
selected range mode.
4.6 Calibration
Power up the analyzer and allow the LED reading to stabilize. Wait at
least ten minutes after powering, giving the heater and bias voltages
enough time to reach operating voltage. Set the alarm set-points and the
full-scale ranges to the desired values.
Procedure:
1. Apply calibration gas of a known concentration. A span gas
containing an oxygen content of 60-100% of the range of the
analyzer is recommended.
Note: If the analyzer output goes above the high alarm set-point
or below the low alarm set-point, the front panel ALARM
Indicator located beneath the SET function buttons will blink.
When the SPAN key is pressed, the alarm indicator will stop
blinking.
2. Press the SPAN button once.