Metex 8760CLP Total Free Chlorine & pH Analyzer - Manual (Page 14)

AQUAMETRIX INC.
1-800-742-1413 www.aquametrix.com
14
Instrument Shop Test Startup
1. Apply 115/230 VAC power to the analyzer.
2. Hook up the chlorine sensor to bottom of analyzer via 5-pin DIN connector. Ensure that the shorting strap on
the sensor connector is removed (refer to illustration 8). Keep shorting jack for future use.
3. With the chlorine sensor in air, the 8760CL analyzer should come up reading 0.0 ppm ± 0.05 ppm.
4. Run an “air” zero check; use wires to be field installed and allow 30 minutes warm-up time for the electronics
to stabilize.
5. Run a “span” check. In the [tFCl] menu, change to these settings: [tc] [SEt] [25.0] and [pH.C] [SEt] [7.50].
A fairly accurate 1 ppm chlorine standard can be made from commercially available bleach; use a fresh 5.25%
solution.
a. Pipet 0.1 mL of bleach into a 1.0 L volumetric flask.
b. Fill to mark with deionized water. This will produce a 5 ppm standardizing solution.
c. Pipet 20 mL of the 5 ppm solution into a 100 mL volumetric flask.
d. Fill to mark with deionized water. This solution should be used immediately after prepared
and then discarded after 2 hours.
e. Fill a plastic beaker with the 1-ppm chlorine standard and place the chlorine sensor into the
beaker and stir.
f. Wait 10 minutes; the 8760CL should read 1.0-ppm ± 0.3 ppm.
Return the [tc] and [pH.C] settings back to [Auto].
6. To check for general performance, place the chlorine sensor in running tap water (chlorinated tap water should
be between 0.2 ppm and 1.0 ppm). The display should read in that range.
7. Hook up the pH sensor via the BNC connector on the underside of the 8760CL analyzer and remove orange
protective cap from sensor tip. Keep the cap for future use.
8. With the pH sensor in pH 7 buffer, the pH analyzer should display a reading of 7.0 ± 0.5 pH.
9. Run a “zero” calibration; 7 pH is equivalent to 0.0 mV so use pH 7 buffer.
10. Run a “span” calibration by placing the sensor in pH 4 buffer. The display should read approximately
4.01 ± 0.05 pH.
11. To check for general performance, place the pH sensor in pH 7 buffer again. It should now read approximately
7.0 ± 0.05 pH.
12. The sensor is now ready for field installation.
13. If the application will be in the caustic region, repeat steps 10 & 11 using pH 10 buffers so that the sensor is
tested in the region of use.
14. Before placing the 8760CL analyzer into operation, verify
the settings to ensure that they agree with the intended
setup. Factory defaults are listed in Appendix B. For the 4
mA to 20 mA output, set high limit and low limit.
15. Set preference for temperature units, ° C or ° F in [CONF]
[unit]; default is ° C.
16. Set desired input signal damping, if known; default is
5 seconds.
17. The analyzer is now ready for field installation.
Illustration 8: Pin location for chlorine sensor shorting jack