MSA PrimaX - Operation

The free end of the test gas tube must be closed if no test gas is applied. This is to prevent gas or air passing
through the tube to the sensor, distorting the measurement or in the reverse pressure conditions, the
ambient atmosphere escapes from the sensor at the free end of the tube.
To ensure proper function the CalGard remote calibration adaptor must be kept dry and free of any
contaminants, e.g. dust particles. Regular visual checks are recommended. Any contaminants must be
removed by blowing them off with clean, oil-free compressed air or with a dry brush. Ensure that the air
entrances are kept free from any coating, e.g. paint, grease or similar.
8.3.2 Operation
Calibration procedure can be carried out as described in chapter 4.3 Calibration of this manual.
To compensate for possible deviations during measurement of flammable gases a calibration factor of 1.05
has to be applied.
Example: Calibration for methane.
Apply 40 %LEL methane and adjust to 1.05 x 40 = 42 %LEL
When using the CalGard for a remote calibration, the response time of the system increases depending on
the length of the test gas tubes used. If the calibration is done automatically, set the calibration setup (menu:
M04) with sufficiently long countdown times for zero gas and calibration gas.
Example: When using a 10 metre long tube with an internal diameter of 5 mm and applying a gas flow of 1
litre/min, the test gas takes a minimum of 20 sec to reach the CalGard remote calibration adaptor. For safe
flushing of CalGard, an additional 10 seconds has to be added to this calculation.
If the CalGard is being used with a control system (i.e. SUPREMA), please ensure the manual for the
controller has been read and understood.
The pressure in the test gas tube increases with rising test gas flow rates. A flow rate of 1500 ml/min results
in a pressure up to 600 hPa. This has to be considered if a flow meter is used which is affected by the media
pressure.
Material St. St. 316
Dimensions (in mm) 60 x 122 (diameter x height)
Weight 0.6 kg
Working temperature -30 °C to +70 °C
Storage temperature -30 °C to +70 °C
Max. wind speed up to 6 m/s
Applicable test gases
H
2
, CH
4
, C
3
H
8
, CO and H
2
S in air, O
2
in N
2
(approval of other gases by MSA on request)
Recommended flow rate 1.0 l / min
Minimum flow rate 0,8 l / min
Maximum flow rate 1.5 l / min
Response times
CH
4
t
50
≤ 15 s t
90
≤ 40 s
C
3
H
8
t
50
≤ 20 s t
90
≤ 55 s
55 PrimaX GB
8 Accessories