Sensor Diagnostics - Hach ORBISPHERE 51 Series User Manual

14.1

Sensor diagnostics

Sensor diagnostics
Calibration timer
Service timer
K1200 sensor
TC sensor -
Gas/Temperature
TC sensor - Amplifiers
The instrument can automatically remind the user when the next sensor
calibration is due.
• Select measurement channel.
• Select enable and enter a delay in days.
• The display shows the current instrument date and time, next calibration
due date and time, and the remaining days.
The next calibration date is updated when the sensor is calibrated. The
event "Cal. required" is generated when the delay has elapsed.
The instrument can automatically remind the user when the next sensor
service is due.
• Select enable and enter a delay in days. This should be validated by a
level 3 user.
The display shows the current instrument date and time, the next sensor
service due date and time, and the remaining days.
The next service date is updated when the button Service done is pressed
after a service. The event "Service required" is generated when the delay
has elapsed.
The sensor(s) attached to your instrument will require periodic servicing and
maintenance. For more information on this, please refer to the manual(s)
delivered with the sensor(s).
Select either General or Zero diagnostic from the menu.
General will display values for the measurements in the sample, while Zero
is used to display values when the gas concentration is at zero (e.g. during
a zero calibration using pure nitrogen as the calibration medium).
The screen layouts are identical for both diagnostic options, and show
useful information for troubleshooting purposes.
The first screen displays measurement information, with a status (OK or
NOK) alongside. A status of NOK indicates the value is outside of the
acceptable minimum or maximum value. To view the acceptable range limits
press the Show criteria button.
The criteria screen displays the acceptable range limits (minimum and
maximum values) for more in-depth troubleshooting.
Note: If Zero diagnostic is selected, a warning message appears. Ensure
the sensor has been calibrated in pure N
This feature allows you to check the ability of the TC measurement board to
measure a range of currents and temperatures. To use this feature a TC
sensor simulator (Part N° 29117) must be used in place of the sensor.
• Depending on the operation(s) to be performed, select V2, V3, Temp or
Select All and press Start
The software performs each check in several steps and asks the user to
select different values on the simulator. For each position, it applies different
anode voltages. For each position and voltage applied:
1. it waits some time (typically 1 minute for a null current)
2. it displays if the values measured are acceptable (OK)
3. it displays the current and temperature values measured
If the current or the temperature is not acceptable, a solution may be the
calibration of the "gas amplifier" or the "temperature amplifier", in which
case please contact your Hach representative.
This feature will display the measured values for V2 and V3 along with the
recommended values. It is advisable to put the sensor in continuous purge
mode during this operation by pressing the Continuous purge button.
If the measured and recommended values differ by a large margin, please
contact your Hach representative for advice.
Services menu
before selecting this option.
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