<2. Installation, Wiring and Piping>
2-10
IM 11T03E01-51E
Electrical Noise Protection
If a malfunction due to noise occurs, strengthen measures against noise.
For example, ground the detector body or use a double-shielded cable. If a double-shielded
cable is used, ground shields of each conductor at one end. Ground one end of the outer shield
on the detector side to the detector case and connect the other end on the converter side to
terminal 13. See the User’s Manual for more instructions on cable installation.
Contact Input Function of the Hydrogen Purity Meter
For hydrogen purity meter, the contact input is used for range selection.
Open: Concentration measurement for Air in CO
2
Close: Concentration measurement for H
2
in CO
2
.
Contact Output Specifications
Indication
Specification
MAINT
Contact Type:
Voltage free, dry contact (mechanical relay contact output)
Contact rating:
250 V AC 3 A or 30 V DC 3 A
Contact arrangement: NO/NC, selectable
ALM
FAIL
Contact Type:
Voltage free, dry contact (mechanical relay contact output)
Contact rating:
250 V AC 3 A or 30 V DC 3 A
Contact arrangement: NC, fixed
SPAN/FUNC
Function contact:
Use distinguish between the Hydrogen purity meter and
the Replacement meter.
Select gas contact:
Use distinguish measuring ranges in the Replacement meter.
Contact Type:
Voltage free, dry contact (mechanical relay contact output)
Contact rating:
250 V AC 3 A or 30 V DC 3 A
Contact arrangement: NO/NC, selectable
ZERO/SEL GAS
Содержание GD402G /M1
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