5.4.4 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.
5.4.5 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.
When set to
Enabled
, at calibration the measurement current should be between 25% and 175% of
the ideal current; if the value is outside of these limits, the calibration fails and
Err
is displayed on the
instrument LCD. Choose
OK
when the desired mode is selected.
Note: It is recommended to leave range checking enabled. In special measurement situations it may be necessary
to disable range checking. However, contact a Hach Lange representative for further details before disabling this
feature.
5.4.6 Entering a span gas value
When calibrating the sensor in a span gas, use the
Configuration
,
Span Gas
menu to enter the
concentration of the gas to be measured in the span gas. Enter the percentage of measurement gas
in the span gas (e.g. 10.00%), then choose
OK
.
5.4.7 Dual use (model 3650/113 only)
5.4.7.1 Change from the PC
Use the
Configuration
,
Dual Use
menu to change the measurement phase (either dissolved or
gaseous) for the model 3650/113 dual-use analyzer. Choose
ppm (dissolved)
to set the instrument
for dissolved measurement in liquids, or
% (gaseous)
to set the instrument to gas phase
measurement.
5.4.7.2 Change from the instrument
1.
Switch the instrument power
OFF
2.
Switch the instrument on by holding down the
Down Arrow
button and then pressing the
POWER
button while still pressing the
Down Arrow
button
3.
The instrument will first display
USE
followed by either
dIS
for dissolved phase measurement in
liquids or
gAS
for gaseous phase measurement
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
Section 6 Calibration
6.1 Pressure calibration
Since the instrument is sealed against moisture, you must open the barometric pressure sensor relief
valve switch on top of the instrument to permit the instrument to achieve atmospheric pressure
equilibrium, and take an accurate barometric pressure reading. This must be done with every
calibration. To open the relief valve, depress and hold down for five seconds, then release.
If you have access to an accurate barometer, you may wish to calibrate the instrument's internal
barometric pressure sensor. This is done using the PC WinLog97 program. Choose
Troubleshooting
,
Pressure Calibration
and an informational message will appear to warn you that
the instrument’s current pressure calibration will be lost.
12
English
Summary of Contents for ORBISPHERE 29122
Page 2: ...Table of Contents English 3 Deutsch 16 Italiano 29 Fran ais 42 Portugu s 55 Nederlands 68 81 2...
Page 82: ...29122 EN 61326 1 2 2 1 2 2 2 3 29122 29122 82...
Page 83: ...2 4 2 5 29122 ATEX 3650EX 83...
Page 94: ...1 CAL 91 2 3 3 CAL 4 5 CAL 25 175 CAL Err 7 7 1 Hach Lange 8 Troubleshooting WinLog97 94...
Page 95: ......
