Omega FCLTX-100 instruction sheet Section Sensor Troubleshooting, Troubleshooting Chart

PRODUCT INSTRUCTION SHEET

SECTION 10.0

SENSOR MAINTENANCE/RECONDITIONING

10.1GENERAL MAINTENANCE. Service the sensor regularly (weekly is suggested)

10.2MEMBRANE CAP REPLACEMENT. If membrane replace- ment is required, a new cap with preinstalled membrane must be used. Order FCLA-2016 replacement membrane cap and FCLA-2015 refill solution. To change membrane cap (do the following over a sink or washbasin):

a) turn sensor upside down with cap facing upward

b) rotate cap counter-clockwise to remove (see FIG 10).

c) fill sensor body with electrolyte using needle and bottle of refill solution (see FIG. 11)

d) install a new membrane cap by threading cap onto sensor rotating cap clockwise (opposite of FIG 10)

10.3MEMBRANE CAP/SENSOR CLEANING. Rinse cap with

water only. If cap does not clean, replace with new one.

SECTION 11.0

SENSOR TROUBLESHOOTING

11.1CALIBRATION PROBLEMS

a)Sensor output HIGHER than DPD test

1)Run in time too short

2)Membrane cap damaged

3)Interference from water contaminants (see Specifications, "Cross Sensitivity")

4)Cable short circuit or damage

5)pH value less than pH 5.5

b)Sensor output LOWER than DPD test

1)Run in time too short

2)Deposits on Membrane cap

3)Flow rate too low

4)Air bubbles on membrane

5)Surfactants in water

6)pH value more than pH 8.0

7)No electrolyte in membrane cap

c)Sensor ouput is 4mA (zero ppm)

1)Run in time too short

2)Only bound chlorine present

3)Chlorine content below detection limit

4)Sensor not wired correctly (See SECTION 6.0 of this manual)

5)Defective sensor

d)Sensor output UNSTABLE

1)Air bubbles on membrane

2)Membrane damage

3)Non-sensor problem

FIG. 10 FIG. 11

INJECT UNTIL SOLUTION

LEAKS OUT OF FILL HOLE

TROUBLESHOOTING CHART

Symptom	Possible Cause	Solution/Remedy
The sensor	1) Run in time too short	1) See Sec 5.0 -CONDITIONING
cannot be	2) Membrane cap damaged	2) Replace cap - See Sec 8.0
calibrated-	3) Interference from contaminants	3) See SPECIFICATIONS
ouput is	4) DPD chemicals bad	4) Use new DPD kit
HIGHER than	5) pH value < pH 5.5	5) Increase pH (5.5-8.0)
DPD Test		See SPECIFICATIONS
	6)Temperatue increased since cal	6) Match calibration temp.
The sensor	1) Run in time too short	1) See Sec 7.0 -CONDITIONING
cannot be	2) Deposits on membrane cap	2) Remove deposits or replace
calibrated-		cap if cleaning ineffective.
output is	3) Flow rate too low	3) increase flow - See
LOWER than		SPECIFICATIONS
DPD Test	4) Air bubbles on membrane	4) Remove and re-install sen
		sor to remove bubbles.
	5) Surfactants in water	5) Remove surfactants and
		replace cap
	6) pH > pH 8.0	6) Lower pH (5.5-8.0)
		See SPECIFICATIONS
	7) No electrolyte in cap	7) Add new electrolyte, run in
		sensor and re-calibrate
	8) Temperature decreased since cal	8) Increase temp to match cal
	9) Organic chlorination agents	9) Use chlorinating agents
	present in water	per DIN 19643
Sensor output	1) Only bound chlorine present	1) Check for Chloramine with
is 4mA (0 ppm)	NO FREE CHLORINE	appropriate DPD test.
		Replace water/ Rechlorinate.
	2) Run in time too short	2) See Sec 7.0 -CONDITIONING
	3) Chlorine content below limit	3) Add chlorine and repeat
		calibration
	4) No electrolyte in cap	4) Refill electrolyte
	5) Sensor electrical connection	5) See SECTION 6.0
	wrong
Unstable output	1) Air bubbles on sensor membrane	1) Tap to remove bubbles
from sensor	2) Membrane damaged	2) Replace membrane, run in
		sensor and recalibrate.
	3) Non-sensor problem	3) check PLC or I/O device
		M4679/0708 page 5 of 6

Parts covered by this product instruction sheet include: FCLTX-100 Series