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01115009A _9
Paracube
®
Micro – Instruction Manual
4.10 Use of Sensor with Flammable / Toxic Sample Gases
The sensor may be used with flammable / toxic sample gases (for example anaesthetic
gases), but due consideration must be given to ensuring the seal has high integrity by
following the mounting guidelines in Section 4.1.
5
Operation and Calibration
Hummingbird calibrates the Paracube
®
Micro prior to shipment; however you are
advised to recalibrate the sensor immediately prior to use to remove any offsets that
may have occurred between shipment and installation.
Calibration of the analogue sensor is made by performing a ‘Single Point Offset
Correction’ (SPOC) and passing ambient or bottled air across the sensor’s diffusion
membrane. The sensors are pre-configured to correct the output to 20.9%.
5.1
Calibration – Initial Conditions
Provide an external power supply as described in section 3.3
Configure the sensor communication as described in section 4.3.
Provide a calibration gas containing 20.9% oxygen with a constant gas flow passing
across the diffusion interface.
5.2
Single Point Offset Correction (SPOC)
Expose the sensor to ambient or bottled air for a minimum of 30s prior to initiating the
SPOC. Initiate the SPOC by using the method described below.
During a SPOC the sensor’s internal pressure device is used to distinguish zero drift
from pressure effects. The pressure device
must
be exposed to the sample gas,
regardless of whether your sensor variant has pressure compensation enabled. If the
pressure device cannot measure the sample gas pressure, errors will be introduced
into subsequent readings. Fig. 7 illustrates the effects of zero drift and ambient
pressure variation.
If you are using a sensor variant that has pressure compensation disabled, oxygen
concentration values reported by the sensor are compensated relative to the factory
calibration pressure of 100kPa.
WARNING USE - No. 2
W
HEN USING THE SENSOR WITH FLAMMABLE
/
TOXIC SAMPLE GASES
,
IT IS
THE RESPONSIBILITY OF THE
‘O
RIGINAL
E
QUIPMENT
M
ANUFACTURER
’
TO
PERFORM APPROPRIATE TESTS TO ENSURE THAT IT MEETS THEIR
REQUIREMENTS AND THAT THE SENSOR IS INTEGRATED IN ACCORDANCE
WITH ANY REGIONAL STANDARDS OR REGULATIONS GOVERNING THE FINAL
APPLICATION
.
