48 • RLDS I&O Manual
The trend graph opens with the cursor located over the
most recent data point. Use the LEFT/RIGHT cursor
keys to move the cursor to different data points.
Holding a key down will cause the cursor to move
rapidly across the screen. As you move the cursor
position, the date and time of that reading, along with
the PPM value, are displayed at the top of the screen
above the graph. The trend graph is automatically
scaled to accommodate the largest PPM value
displayed. The ZOOM OUT and ZOOM IN options
allow you to adjust the vertical scale of the graph.
The trend data is stored on a first-in, first-out basis.
After 100 trend values have been stored, the 101st
value will replace the first value stored; therefore, in
normal operation, when entering trend mode the
cursor will be located at the most recent data point.
The data points to the left of the initial cursor location
will be the next most recent. The data point to the
right will be the oldest data point in the buffer and will
be overwritten by the next data point.
The Trend Data Log can be reset by pressing a
combination of the
ENTER
and right arrow buttons
while viewing the log.
When finished, press the
ESC
key to revert to the
previous screen.
7.9. The Calibration Screen
7.9.1. Overview
The Calibration Screen is used to adjust the
calibration factor for each refrigerant gas. It is also
used to program the instrument for new gases.
IMPORTANT:
Changing information on
CAL
FACTOR
will VOID the factory calibration.
Typically, the unit will remain within the factory-
calibrated accuracy indefinitely and no calibration is
required. Complex software algorithms adjust for
temperature drift, IR source aging, and pressure
changes in order to keep the unit within factory
accuracy specifications.
7.9.2. Navigating to the Calibration
Screen
On the
System Setup screen
(
), select the
Calibration option abbreviated
CAL
.
7.9.3. Calibration Procedure
The
CAL FACTOR
is determined by sampling a
known dilution of the type of gas to be sampled.
Calibration is best performed at or near full scale. It
can, however, be done at any concentration, and
ideally in the range where maximum accuracy is
desired down to, but not below, 100 PPM.
A cylinder of the desired gas at a certified PPM level
must be used to assure sampling occurs at ambient
conditions. A minimum sample size of 5 liters is
required.
The RLDS monitor should be operating for at least
one hour prior to performing a calibration.
Prepare the RLDS for sampling by initially setting its
CAL FACTOR to
1.000
. Next, set up the RLDS for a
logging interval of zero minutes (
), and place the RLDS in its zone hold mode
for the zone you wish to use for calibration purposes
).
Figure 7-10
- Trend Screen
Figure 7-11
- Calibration Screen
Summary of Contents for GW-810-3760
Page 1: ...Refrigerant Leak Detection System RLDS Installation and Operation Manual 026 1309 Rev 11 ...
Page 37: ...30 RLDS I O Manual 026 1309 Rev 11 Figure 4 22 Connecting the Gateway to the RS485 Network ...
Page 84: ...Appendix B System Menu Map B 79 Appendix B System Menu Map ...
