Hach 2100N - 8.3.2 Other Instrument Diagnostics

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SECTION 8, continued

8.3.2 Other Instrument Diagnostics

8.3.2.1 Display Segments and Icons

Determine the proper functioning of all display segments and icons by using

diagnostic 22.

8.3.2.2 Cold Start

A cold start of the instrument erases from memory any calibration data entered by

the user. The instrument must be recalibrated before use. Press and hold the CAL

key, and then turn the instrument power on to place the instrument in a cold start

condition. After cold start, the CAL? annunciator flashes until another four-

standard calibration is entered. The instrument initializes in the CAL mode.

8.3.2.3 Flashing 9s

If the display flashes all 9s, the sample being measured is over-range (for the

selected range of measurement). The instrument also indicates over-range if the

sample is >40 NTU (268 Nephelos or 9.8 EBCs) with the Ratio off (refer to

Section 2.8 on page 29).

8.3.2.4 Flashing 0s

If the display flashes 0s, the measurement indicates a negative turbidity value.

Recalibrate the instrument (see Section 3.2.4 on page 39).

54 xxxxx A/D Reference High mV, Gain 100

55 xxxxx A/D Reference High mV, Gain 1,000

56 xxxxx Ground mV, Gain 1

57 xxxxx Ground mV, Gain 10

58 xxxxx Ground mV, Gain 100

59 xxxxx Ground mV, Gain 1000

60 xxxxx +5 System Volts

61 xxxxx -5 System Volts

62 xxxxx Lamp Volts

63 xxxxx +8 System Volts

64 xxxxx Calibration Coefficient A0

65 xxxxx Calibration Coefficient B0

66 xxxxx Calibration Coefficient B1

67 xxxxx Calibration Coefficient C0

68 xxxxx Calibration Coefficient C1

69 xxxxx Calibration Coefficient C2

Table 6 Diagnostic Codes (Continued)

Code Display Description

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