User manual EUTECH INSTRUMENTS PC 700

[. . . ] Instruction Manual PC 700 pH/mV/Conductivity/ºC/ºF Bench Meter Technology Made Easy . . . Part of Thermo Fisher Scientific 68X541704 Rev 2 Sep. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GETTING STARTED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. 1 2. 2 2. 3 Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] CONDUCTIVITY AND TDS CALIBRATION 5. 1 Automatic or Manual Calibration The PC 700 is capable of automatic or manual calibration for conductivity, and manual calibration for TDS. In the automatic calibration mode, the meter will automatically select one of (4) conductivity calibration standard values depending on the range and normalization temperature being used (TABLE 1). 6 If you only use calibration standards that are listed in TABLE 1, automatic calibration is recommended. If you intend to calibrate with one or more standards that are not listed in TABLE 1, the PC 700 must be set for manual calibration instead. The factory default is automatic conductivity calibration. See Section 9. 11 to change this setting. There is no automatic calibration value available for conductivity range 1. Range # r1 r2 r3 r4 r5 Conductivity Range 0. 00 ­ 20. 00 S 20. 1 ­ 200. 0 S 201 ­ 2000 S 2. 01 ­ 20. 00 mS 20. 1 ­ 200. 0 mS TABLE 1 Automatic Calibration Values Normalization Temperature 25 ºC None 84 S 1413 S 12. 88 mS 111. 8 mS 20 ºC None 76 S 1278 S 11. 67 mS 102. 1 mS Range # r1 r2 r3 r4 r5 TDS Range (using 0. 5 TDS factor) 0 ­ 10. 00 ppm 10. 1 ­ 100. 0 ppm 101 ­ 1000 ppm 1. 01 ­ 10. 00 ppt 10. 1 ­ 100 ppt Automatic Calibration Values none none none none none 5. 2 Single or Multi-Point Calibration Use Single-Point Calibration to apply a single calibration value across all ranges. 7 Use Multi-Point Calibration for individual calibration in each range. This will restrict an individual calibration so that it is applied to one range only. When using multi-point calibration, perform a calibration in each range that you expect to use for best results. The factory default is Single-Point Calibration. See Section 9. 12 to change this setting. 5. 3 General Calibration Tips For best results, periodic calibration with known accurate standards is recommended. A maximum of one calibration point per range can be performed. If multiple calibration points are used in the same range, the most recent one will replace the previous one. When the electrode is replaced, it is best to clear the calibration to the factory default values (see Section 9. 14). Rinse or immerse the probe before calibration and between samples with clean water (deionized water is ideal). The PC 700 has non-volatile memory which will retain all calibration values, as well as meter settings and memory values upon meter shut down or unexpected power loss. To protect from erroneous calibrations, the allowable tolerance is ±40% of the factory default value. Low conductivity standard solutions (less than 20 µS) are unstable and are very temperature dependent. As a result, reproducible calibration results are challenging in lowest measurement range #1 (0. 00 to 20. 0 µS). 5. 4 Automatic Conductivity Calibration Procedure 1) 2) 3) Press as needed to select conductivity (S or mS). Dip the electrode into the conductivity standard and press . The primary display will show the factory default value, while the secondary display will lock on the appropriate automatic standard value from TABLE 1. 8 4) When the READY indicator appears, press to accept. To manually select the next range, press again. [. . . ] Select valid key depending on current mode. Ensure that the conductivity electrode guard is attached. Use fresh standard or use an alternate calibration standard. Use fresh standard or use an alternate calibration standard. [. . . ]