aspida
– User Manual
Document Ref: PGA-801-10
-
December 2014
Page 18
Maintenance
Calibration
It is normal that the
aspida
’s sensor readings will drift over time. It is therefore important that the
sensors are periodically re-calibrated. The regularity of calibration depends upon the sensor.
Carbon dioxide sensors should be calibrated every 12 months.
Oxygen sensors should be calibrated every 2 months.
Oxygen calibration should be performed in fresh air as described in the next section. Carbon dioxide
calibration should be performed using the
aspida
calibration kit and
aspida
configuration software.
See the
aspida
configuration software user manual for instructions for calibrating a carbon dioxide
sensor.
Oxygen fresh air calibration
Due to the nature of the electrochemical technology of the oxygen sensor in the Analox
aspida
, the
sensor output will drift over time. To allow the calibration of the oxygen monitor to be adjusted without
the need to apply a full zero and span calibration, the
aspida
has a function which allows the user to
span calibrate oxygen monitoring in fresh air. This feature is only available on devices where an
oxygen sensor is fitted.
WARNING:
The fresh air calibration of oxygen is only intended to be performed in ambient
air. The calibration assumes an atmospheric oxygen concentration of 20.9%. The fresh air
calibration should not be performed indoors.
To perform an oxygen fresh air calibration:
1) Take the Analox
aspida
outdoors into fresh ambient air. (If moving the device outdoors
exposes it to a sharp temperature change it is recommended that the device be allowed 5
minutes to allow the temperature of the device to stabilize.)
2)
Hold the device at arm’s length throughout the calibration procedure to ensure that breathing
on the sensor inlets does not affect the calibration.
3) Press the
button to access the device menu.
4) Highlight the
icon and press
.
5) The following confirmation screen will be presented. Press
to begin the calibration or press
to cancel.
Figure 12 - Oxygen fresh air calibration confirmation screen
6) The unit will now sample the ambient air for 30 seconds to detect a stable oxygen reading.
The progress of the sampling will be displayed on screen as shown below.
Figure 13 - Calibration progress
Summary of Contents for aspida
Page 1: ...aspida User Manual...
