Detcon FP-700 User Manual download pdf (Page 25)

Model FP-700

FP-700 Instruction Manual Rev. 3.0 Page 21 of 40

Butane 1.71 Ethylcyclopentane 2.52 n-Pentane 2.18

iso-Butane 1.93 Ethylene 1.41 iso-Pentane 2.15

Butene-1 2.20 Ethylene Oxide 1.93 Propane 1.81

cis-Butene-2 2.06 Diethyl Ether 2.16 n-Propyl Alcohol 2.12

trans-Butene-2 1.97 Ethyl Formate 2.26 n-Propylamine 2.07

n-Butyl Alcohol 2.91 Ethyl Mercaptan 1.78 Propylene 1.95

iso-Butyl Alcohol 1.89 n-Heptane 2.59 Propylene Oxide 2.18

tert-Butyl-Alcohol 1.34 n-Hexane 2.71 iso-Propyl Ether 2.29

n-Butyl Benzene 3.18 Hydrazine 2.22 Propyne 2.40

iso-Butyl Benzene 3.12 Hydrogen Cyanide 2.09 Toluene 2.47

n-Butyric Acid 2.63 Hydrogen 1.30 Triethylamine 2.51

Carbon Disulphide 5.65 Hydrogen Sulphide 2.54 Trimethylamine 2.06

Carbon Monoxide 1.32 Methane 1.00 Vinyl Chloride 2.32

Carbon Oxysulphide 1.07 Methyl Acetate 2.01 Vinyl Ethyl Ether 2.38

Cyanogen 1.12 Methyl Alcohol 1.16 o-Xylene 2.79

Cyclohexane 2.43 Methylamine 1.29 m-Xylene 2.55

Cyclopropane 1.60 Methylcyclohexane 2.26 p-Xylene 2.55

The menu item appears as: “Set Gas Factor”.

From the Set Gas Factor text scroll, hold the magnet over PGM1 or PGM2 until the “◄” prompt appears and

continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll “Set

Factor”). The display will then switch to “X.XX“ (where X.XX is the current gas factor). Swipe the magnet

momentarily over PGM2 to increase or PGM1 to decrease the gas factor level until the correct value is

displayed. Hold the magnet over PGM1 or PGM2 for 3 seconds to accept the new value. The display will

scroll “Factor Saved”, and revert to “Set Gas Factor” text scroll.

Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic

timeout of about 15 seconds (the display will scroll “Set Gas Factor” 4 times and then return to Normal

Operation).

3.5.5 Set Cal Factor

Because of the catalytic bead sensor’s almost universal response to combustible gases, the FP-700 sensor can

be span calibrated with any of the combustible gases listed in Table 2 above. This specific gas is referred to as

the “cal gas”.

NOTE:

The default value for cal factor is 1.0. This would be used when methane is the cal gas.

Values other than 1.0 would be used when the span cal gas is not methane.

Set Cal Factor is used to make the appropriate signal sensitivity adjustment when the cal gas is a gas other

than methane. This is necessary because the catalytic bead sensor has different signal strengths for each

combustible gas and all reading calculations are made based on a reference to methane. The cal factor value is

adjustable from 0.2 to 5.0. It represents the translation between the cal gas and methane gas, where methane

has a normalized cal factor = 1.0. For example, the cal factor for butane is 1.71 because the signal strength of

butane is 1.71 times lower than methane. The current setting can be viewed in View Program Status.

Table 2 shows the Cal Factors of most combustible gases that will be used as span calibration sources. Find

the gas of interest and enter that value the Cal Factor. For example, if propane were used as the cal gas, the

correct cal factor would be 1.81.

The menu item appears as: “Set Cal Factor”.

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Detcon FP-700 User Manual Page 25

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