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by pressing the "scroll" then "accept" button.
5. Remove the calibration adaptor and shut off the gas.
6. Ensure that the output decreases to a stable 4 mA ±0.2 mA, this should
take about 5 to 15 minutes.
NOTE: If the output doesn't decline to 4mA ±0.2 mA, an
internal offset procedure may be necessary. This procedure
can be found in the troubleshooting section of this manual
(see page 27). In addition, if low level signals appear to be
surfacing occasionally slightly above 4mA, the internal offset
setting may be the issue, especially for differences in gain
settings that have occurred over time.
Press the button for 2 seconds to place the unit back into run mode. The
green LED will glow steadily, or for units the LCD option, exit from
calibration mode using the front panel push buttons. Exit: Press and hold
the button for one or two seconds. The green (left) LED on continuously =
normal operation.
NOTE: The Span Calibration Mode will automatically time out after 10 minutes.
Span Signal Formula
Normal span gas is full scale. To achieve maximum accuracy, full-scale
span gas must be used. If the span gas is not full scale, use this formula:
(
)
Signal
mA
=
Where:
ASGC = Available Span Gas Concentration
SFSV = Sensor Full Scale Concentration Value
Example: If 100 ppm ASGC gas is used to calibrate a 250 ppm SFSV sensor,
100 ppm
the signal would be as follows:
Signal =
�
250 ppm
10.4 mA = 104 mV from TEST (—) to TEST (+)
If the correct output cannot be achieved, a replacement sensor may be
required.
A S G C
�
�
x 16 + 4
S F S V
�
X 16 + 4 = 10.4 mA
OPERATOR MANUAL
Continuous ON
25
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Table of Contents
Troubleshooting
