Hach sc100 1720E User Manual

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Section 7 Troubleshooting
7.1 Error Codes
When a sensor is experiencing an error condition, the sensor reading on the
measurement screen will flash and all relays and analog outputs associated with
the sensor will be held.
Highlight the Probe Diag menu and press ENTER. Highlight Errors and press
ENTER to determine the case of the error. Errors are defined in Table 9.
7.2 Warnings
A sensor warning will leave all menus, relays, and outputs functioning normally,
but will cause a warning icon to flash on the right side of the display. Highlight the
Probe Diag menu and press ENTER to determine the cause of the error.
Warnings are defined in Table 10.
A warning may be used to trigger a relay and users can set warning levels to
define the severity of the warning. Errors are defined in Table 10.
Table 9 Error Codes
Displayed Error Definition
A/D Fail Failed A/D converter. Call the Service Department.
Lamp Fail
The light source has failed. See section 6.4.4 on page 49 for
instructions for replacing it.
Flash Fail Datalog and event log will not work.
Table 10 Warning Codes
Warning
Number
Displayed Warning Definition/Resolution
1 Dark Reading Warning Dark reading detects too much light.
2 Temperature Warning
Sensor head internal temperature is higher than specified. Contact the Service
Department.
3 Data Log Full Warning
Sensor data log is full. No additional data will be logged until sensor log is
downloaded into controller memory.
4 Event Log Full Warning
Sensor data log is full. No additional data will be logged until sensor log is
downloaded into controller memory.
5 5 Volt Warning
Monitored voltage is outside the range of 4.5 – 5.5 V @ microprocessor input ->
698 to 854 counts from the microprocessor ADC.
6 Voltage in Warning
Monitored voltage is outside the range of 9.08 – 14.3 V @ microprocessor pin ->
279 to 435 counts from the microprocessor ADC.
7 Lamp V Warning
Monitored voltage is outside the range of 3.96 – 4.48 V @ microprocessor pin ->
614 to 385 counts from the microprocessor ADC.
8 Lamp I Warning
Monitored voltage is outside the range of 1.67 – 2.75 V @ microprocessor pin ->
39 to 64 counts from the microprocessor ADC.
9 Output Mode Not Normal
Activated when the sensor is not in normal measurement mode (such as when in
calibration or verification mode).

Hach sc100 1720E Specifications

General

Model	sc100 1720E
Measurement Parameter	Turbidity
Resolution	0.01 NTU
Detector	Silicon Photodiode
Repeatability	±1% of reading or ±0.01 NTU, whichever is greater
Power Supply	100 - 240 VAC, 50/60 Hz
Measurement Principle	Nephelometric
Light Source	LED
Operating Temperature	0 to 50 °C (32 to 122 °F)
Output	4-20 mA
Enclosure Rating	NEMA 4X/IP66
Accuracy	±2% of reading or ±0.02 NTU, whichever is greater