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Model 12-64/8-66

4

   Doc. No. 06EN003322 Rev.-

Adjustment With The Sensing Element Wet

1. Determine that the sensing element is wet.

2. Apply power to the instrument and allow 10 minutes for the sensing element to become active and stabilize.

3. Locate the potentiometer (R5) and the red LED on the control circuit.  (See the picture on the previous page.)

4. If the LED is off, turn the potentiometer clockwise until the LED turns on.  With the LED on, turn the potentiometer

slowly, counterclockwise one quarter turn past the point at which the LED just turns off.  The potentiometer may
have up to a quarter turn of hysteresis in either direction.  If the mark is overshot, repeat the procedure.

Note: Give consideration that significant amounts of air or gas flowing over the sensing element may lower the

sensor dry signal, resulting in a false indication of wet.

If there are still problems, see the Troubleshooting Section in the 12-64/8-66 Series Manual, Document
Number 06EN003264.  To acquire a manual call your local FCI sales representative.

In the event that the instrument does not operate as expected use the following table.

P r o b le m ?

V e r if y   in p u t   p o w e r   t o

t h e   in s t r u m e n t .

T u r n   p o w e r   O F F .

R e m o v e   c o n t r o l  c ir c u it .

R e in s t a ll c o n t r o l c ir c u it .

T u r n   p o w e r   O N .

E N D

V e r if y   c o n t r o l

c ir c u it   v o lt a g e s .

S im u la t e   a la r m

c o n d it io n .

S T O P

C a ll F C I  f o r

in s t r u c t io n s .

F a i l

S T O P

C a ll F C I  f o r

in s t r u c t io n s .

P a s s

P a s s

F a i l

F a il

S T O P

C a ll F C I  f o r

in s t r u c t io n s .

P a s s

Verify HTR and

RTD Resistance

Check the jumper positions of J12
and J13.  Jumper J12  energizes the
relay at flow/wet.  Jumpers J13
energizes the relay at no flow/dry.

Check that the control circuit is
firmly seated into it's socket.

Check if power is present and
customer fuses are good, if they are
used.

This document contains confidential technical data, including trade secrets and proprietary information which are the property of Fluid Components Intl
(FCI).  Disclosure of this data to you is expressly conditioned upon your assent that its use is limited to use within your company only (and does not include
manufacture or processing uses).  Any other use is strictly prohibited without the prior written consent of FCI.

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