Section Calibration, Section Sensor Storage

PRODUCT INSTRUCTION SHEET

SECTION 8.0

CALIBRATION

IMPORTANT NOTE: SENSORS ARE SUPPLIED FACTORY CALIBRATED WITH A 4-20mA SIGNAL OUTPUT CORRESPONDING TO THEIR SPECIFIC RANGE (0-2, 0-5 OR 0-10ppm). SPAN CALIBRATION IS NECESSARY WHEN RECEIVING A NEW SENSOR SINCE YOUR CONDITIONS MAY VARY FROM THOSE USED AT THE FACTORY FOR SPAN CALIBRATION. THE ZERO POINT CALIBRATION IS NOT NECESSARY SINCE THE ZERO SETTING IS VERY STABLE.

PERIODIC CALIBRATION ( ABOUT ONCE PER WEEK) IS RECOMMENDED. THIS IS USEFUL IN TRACKING SENSOR FAILURES AS WELL.

8.1Removal of cord grip to access ZERO and SPAN potentiometers inside the sensor body:

a.Remove top nut of cord grip as shown in FIGURE 4.

b.Remove remaining cord grip as shown in FIGURE 5. A wrench may be required.

8.2Slope Calibration:

a.Determine the free chlorine content using a diethyl-p- phenylenediamine (DPD) colorimeter test kit (see FIGURE 9.), not included with ClO2 sensor and flow cell.

b.Measure Free Chlorine content with sensor. Make sure that calibration flow rate and pH matches flow rate when measuring sample since probe output is flow rate and pH dependent. Make sure pH is within 5.5-8.0 range.

c.Adjust the span potentiometer to the desired mA (see

FIGURES 9 & 9A)

c. Repeat this slope calibration one day after sensor is initially installed.

d. Repeat the slope calibration monthly.

SECTION 9.0

SENSOR STORAGE

9.0STORAGE. Store sensor at 5o C- 50o C ONLY and maximum humidity of 90% (non-condensing).

a.Short Term Storage (1 week or less): Store in Flow cell with water to prevent the probe from drying out.

b.Intermediate Term (1 week to 1 month): Store in cap, bottle, or beaker with water to keep membrane wet.

c.Long Term (1 month or longer): Remove Membrane Cap and store completely immersed in tap water. Turn sensor upright and shake it to remove fill solution from inside the sensor.

d.Electrolyte bottle shelf-life = 1 year from date of manufature(see expiration date on bottle)

FIG. 4

FIG. 6

FIG. 9

FreeC Cl2

FIG. 5

FIG. 7

Left							Right
potentiometer							potentiometer
(Zero adjust)							(Span adjust)

Cable

FIG. 8

to Increase output

to Decrease output

	ZERO READ			Note: The DPD method
	ZERO READ			for Free chlorine mea-

	FreeClO2Cl
	FreeClO2Cl			surement is not selective
				surement is not selective
				for free chlorine alone.
				for free chlorine alone.
				Other oxidants in the
				water can also be mea-
				sured as free chlorine.
				M4679/0708 page 4 of 6

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