MSA PrimaX IR, Operating Manual

Page: 20 / 44

PrimaX® IR
20
Start-up and Calibration
GB
Calibration Settings
Bump Check Procedure
A bump check verifies the sensor response to a known concentration of gas. The recommended equip-
ment for a Bump Check is the HART Calibration Cover/Bump Cap (P/N 10122228). A known concen-
tration of gas should be supplied to the inlet port of the Bump cap and compared to the gas value on
the output signal (see Fig. 10). Alternately, if using the environmental guard to perform a bump check
the gas should be delivered to both ports of the environmental guard from a 1.5 l/min regulator. Use
PrimaX IR Calibration Kit #55 for the tubing, regulator and Remote HART screens shown below.
Target Gas
Range
% LEL
ATEX
performance
certified
Calibration
Gas
Span
Value %
LEL
t50 t90
Gas Curve
Number
Methane 0-100 Yes 2.5%v/v Methane 57

12 s

22 s 1
Propane 0-100 Yes 0.6%v/v Propane 35

10 s

25 s 2
Toluene 0-50 Yes 2.5%v/v Methane 57

11 s

28 s 3
n-Butane 0-100 Yes 0.6%v/v Propane 37

10 s

24 s 2
n-Pentane 0-100 Yes 0.55%v/v n-Pentane 50

11 s

24 s 2
n-Hexane 0-100 Yes 0.5%v/v n-Hexane 50

11 s

24 s 2
Propylene 0-100 Yes 1.0%v/v Propylene 50

11 s

25 s 3
Ethane 0-100 Yes 1.2%v/v Ethane 50

11 s

23 s 3
Propylene Oxide 0-100 Yes 2.5%v/v Methane 19

11 s

25 s 3
Acetone 0-100 Yes 2.5%v/v Methane 44

11 s

25 s 2
Cyclopentane 0-100 Yes 0.6%v/v Propane 35

10 s

25 s 2
Ethyl Acetate 0-100 Yes 2.5%v/v Methane 21

12 s

25 s 2
IsoButane 0-70 Yes 0.65%v/v IsoButane 50

12 s

26 s 2
Ethylene 0-100 No 1.35%v/v Ethylene 59

10 s

23 s 3
Xylene 0-100 No 1.35%v/v Ethylene 19

10 s

25 s 3
1 Response time t50 and t90 with HART calibration cover, gas flow rate 1.5 l/min
2 IEC 60079-20-1 was used as bases for converting test and calibration gas concentrations from %
LEL to % volume fraction
3 For the measurement of n-Pentane, n-Hexane, Propylene, Ethane or Isobutane PrimaX IR shall be
calibrated with the target gas at a span value of approximately 50 % LEL.