Hach ORBISPHERE 3650 ATEX Manuel D'utilisation De Base page 18

7.4.1 Automatic data acquisition - setting sampling intervals
The instrument can perform as a standalone data acquisition device, automatically recording gas
measurements with the date and time, and storing up to 500 of these values. Choosing the
WinLog97 program's Configuration, Sampling Rate menu lets you select time intervals (acquisition
rate) for this storage capability.
Use the slide bar to view and select a sampling rate, from 15 seconds to 1 hour. The selected rate is
shown in the Acquisition rate window. Click OK to save this rate. Once your choice is made, the
instrument can be used independently of the WinLog97 program for data acquisition, as described in
Automatic data acquisition
Note: The Acquisition rate set via this menu is independent from the monitoring chart updating rate described in
Monitoring measurements in real-time
acquisition, while the chart updating rate is used only for displaying real-time results via the monitoring chart.
7.4.2 Membrane selection
You may find it necessary to use a different type of membrane for different applications. Naturally,
with any membrane change, you will need to re-calibrate (see
should also consider the changes in required flow rates and response times, which are specified in
the accompanying Sensor Manual.
To re-configure the analyzer, choose Configuration, Membrane to bring up the box which reveals
the membrane models available. Choose OK when the desired membrane is selected.
7.4.3 Selecting type of calibration
7.4.3.1 Select from the PC
You can use the Configuration, Calibration mode command to select how the sensor is to be
calibrated.
Note: Only the calibration modes applicable to your sensor can be selected. Others will be grayed out.
Choose In Air to allow calibration of the sensor in air. Choose In Line to calibrate the sensor directly
in the sampling line, in a sample of known gas content. In instrument models that measure gaseous
samples, you may select In a Span Gas to calibrate. Choose OK when the desired mode is selected.
7.4.3.2 Select from the instrument
1. Switch the instrument power OFF
2. Switch the instrument on by holding down the CAL button and then pressing the POWER button
while still pressing the CAL button
3. The instrument display will show either SPA for span gas calibration, LI for in line calibration, or
Air for in air calibration
4. Use the Up/Down Arrow buttons to change the mode to your choice
5. Press the STO button to set the selected mode. The instrument displays Sto for a few seconds,
then returns to measurement mode
7.4.4 Locking out the instrument's CAL button
You can use the Configuration, Calibration Key Status menu to prevent an accidental sensor re-
calibration from the instrument keyboard.
Choose Disabled to lock out the keyboard CAL button. To unlock this capability, choose Enabled.
Choose OK when the desired mode is selected.
7.4.5 Sensor calibration range checking
When calibration is performed for In Air and In a Span Gas calibration modes, the sensor
measurement current is compared to an ideal current for the selected membrane to determine
whether or not to complete the calibration. You can use the Configuration, Calibration Range
Checking menu to enable or disable sensor calibration range checking in the instrument.
Choose Disabled to calibrate without checking the value of the measurement current, within a range
of 0% to 999% of the ideal current.
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on page 14.
on page 16. The sampling rate menu applies only to automatic data
Sensor calibration on page 20). You