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AZI Customer Service 800-528-7411 or 602-470-1414
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Fresh Air Solenoid
An external three-way solenoid can be used to provide fresh air or conditioned air during sensor
regeneration. This may be necessary if the sample stream lacks molecular oxygen. A low
current six volt DC solenoid, connected between pins 19 and 11 of the 25 pin rear panel
connector, will be energized during the regeneration cycle if the Option Functionality switch
SW100 #6 is placed in the OFF position.
If needed, the circuit may be built from the following components and configured as shown in
the following diagram. It will only function if the 431-X instrument has the Option
Functionality.
Required Parts:
Suggested Part
Similar AZI P/N
1 solenoid, 6volt 3way
Angar P/N 407569
1300 1004
1/8" to 1/16" tubing adaptor
Any
1300 0025
1/2" clamp, adhesive mount
Any
6000 0013
1/8" tube to instrument adaptor
Any
1400 3010
3" 1/8" tubing
Tygon Formula E3603
2500 3001
A/R 1/16" tubing
Tygon Formula 2375
345-0244
1 25 pin male DB-25 connector
Solder-cup style
AMP 747912-2
None *
1 connector hood
AMP 749626-2
None *
* These are types not stocked by AZI, but should be available overnight from many AMP
stocking distributors such as Digi-Key Corporation. There are multiple suitable alternatives such
as Radio Shack’s 276-1547 and 276-1549.