Arizona Jerome 631-X Fresh Air Solenoid, Required Parts Suggested Part Similar AZI P/N

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 board SW100 switch 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 option board is installed in the 631-X instrument.

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 R3603	2500 3001
A/R 1/16" tubing	Tygon Formula R3603	2500 3002
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.

			1/8" TUBE		1/16" TUBE				1/16" TUBE
TO INSTRUMENT										TO SAMPLE
										SOURCE
						1/16" TUBE		TO FRESH AIR
								SOURCE
				PIN 1				PIN 1
		REAR OF CONNECTOR,					REAR OF CONNECTOR,
	CONNECT TO PINS 11 AND 19					CONNECT TO PINS 19 AND 21
	MOST INSTRUMENTS					631-X SHIPPED IN 1994 ONLY

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