ENMET EX-5100 - Manual (Page 12)

ENMET Corporation EX-5100 C OMBUSTIBLE
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Calibration:
Calibration of Standard Gases: Calibration of the EX-5100 should be preformed using the target gas unless Methane is
known to be a possible background hazard. Reference Table 2 Standard Span Gas
The EX-5100 was factory calibrated using 50% LEL levels of gases. Other levels, minimal 20% LEL, are acceptable. Contact
ENMET prior to use.
Table 2: EX-5100 Standard Span Gas
Gas Range Alarm 1* Alarm 2* Alarm 3* Span Calibration Gas Calibration Point
Methane 0 – 100 %LEL 10% LEL 20% LEL 50% LEL 50% LEL Methane 50% LEL Methane
Propane 0 – 100 %LEL 10% LEL 20% LEL 50% LEL 50% LEL Propane 50% LEL Propane
Hydrogen 0 – 100 %LEL 10% LEL 20% LEL 50% LEL 50% LEL Hydrogen 50% LEL Hydrogen
Butane 0 – 100 %LEL 10% LEL 20% LEL 50% LEL 50% LEL Butane 50% LEL Butane
* N OTE : These internal sensor/transmitter alarms are independent of the 4-20mA Controller alarm point settings.
C AUTION : If Methane is a possible hazard, calibration should be done using Methane.
Calibration of Non-Standard Gases: The EX-5100 range is 0 – 100% LEL. All Non-Standard gas instruments have been
factory calibrated on LEL of Methane.
Methane is considered to have a coefficient or relative response of 1.00(one). Calibration coefficients relative to Methane have
been generated for over 30 different combustible hydrocarbons and solvents. A partial list of these gases and vapors are listed
in Table 3 Non-Standard Gas. An example of how to use this list of relative response coefficients is shown below.
Example: Acetone coefficient factor is 2.86
20%LEL Methane multiplied by the coefficient of 2.86 = 57
Apply the 20%LEL Methane to the instrument the display should read 57, 57 = 57%LEL Acetone. See Section 5.2.2 Span Gas.
C AUTION : If Methane is a possible hazard, the instrument should be programmed and calibrated for Methane. Calibration
should be done using Methane.
Table 3: Selected EX-5100 Non-Standard Gas
Gas %LEL Coefficient
Calibration Gas
%LEL Methane Display Reads
Acetone 2.6% 2.86 20 57
Isobutane 1.8% 1.82 20 36
n-Butane 1.8% 1.82 20 36
Cyclohexane 1.3% 2.22 20 44
Ethane 3.0% 1.18 40 47
Ethanol 3.3% 2.22 20 44
Ethyl Acetate 2.2% 2.86 20 57
Ethylene 2.7% 1.54 40 62
Hydrogen 4.0% 1.05 50 52
Isopropyl Alcohol (IPA) 2.2% 2.86 20 57
Methanol 6.7% 1.43 40 57
Methyl Ethyl Ketone(MEK) 1.9% 2.86 20 57
n-Pentane 1.4% 2.00 20 40
Propane 2.1% 1.67 40 67
Toluene 1.2% 2.50 20 50
Xylene 1.1% 2.50 20 50
In addition to the established coefficients listed in Table 3 above, ENMET can generate calibration data for most common
combustible gases and vapors for which a sample can be readily obtained.