Hach sc100 1720E - User Manual

Questions and Answers

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wrandolphJul 26, 2025
What to do if the Hach sc100 1720E Measuring Instruments shows a low signal?
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  stephanie99Jul 27, 2025
  If the Hach Measuring Instruments shows a low signal, it could be due to several reasons. The photocell or lens might be coated or dirty, requiring cleaning. Disconnected photocell wires should be reconnected. If the photocell is broken or cracked, it needs replacement. An obstructed light path should be cleared, and if the sample turbidity exceeds 100 NTU, consider switching to a high range turbidimeter. Also, check for bad lamp causes and apply the corresponding corrective actions. Cleaning the lens can be done using isopropyl alcohol and a cotton swab.
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Mitchell WagnerJul 31, 2025
How to fix a bad lamp error on Hach sc100 1720E?
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  ashleyyangJul 31, 2025
  If the Hach Measuring Instruments displays a 'Bad Lamp' error, it could be due to several reasons. The lamp might have burned out and needs replacement. Ensure the lamp is properly connected; restore any loose connections. Check the +12 V connection at the controller and restore it if loose. If the lamp is dislodged, reinstall it.
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christophernewmanAug 4, 2025
What to do if Hach sc100 1720E Measuring Instruments displays bad system voltage?
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  Carol MillerAug 4, 2025
  If the Hach Measuring Instruments displays a 'Bad System Voltage' error, improper wiring at the controller may be the cause. Fluctuations in voltage can also trigger this error; try turning the instrument power off and back on.
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jamessmithAug 8, 2025
What to do if Hach sc100 1720E has continuous overrange (100 NTU)?
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  Andrew BrownAug 8, 2025
  If the Hach Measuring Instruments shows a continuous overrange (100 NTU), verify the accuracy of calibration standards and recalibrate the instrument. The cause might be that calibration standards are not in the correct order or incorrect dilution.
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Michael CunninghamAug 12, 2025
How to resolve high dark counts on Hach sc100 1720E Measuring Instruments?
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  Crystal BarnesAug 12, 2025
  If the Hach Measuring Instruments reports high dark counts, ensure the turbidimeter head is correctly positioned on the turbidimeter body or calibration cylinder during Power Up or Zero Electronics. Misalignment or light leaks can cause this issue, so realign the head and repower the instrument or perform ZERO ELECTRONICS in the CALIBRATION MENU.
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Adrienne DavisAug 16, 2025
How to resolve A/D Converter Timeout error on Hach sc100 1720E?
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  Travis MartinezAug 16, 2025
  If the Hach Measuring Instruments displays an A/D Converter Timeout error, try turning the instrument power off and back on. A fluctuation in voltage can cause this.
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Michael MartinezAug 21, 2025
What to do if Hach Measuring Instruments has continuous underrange (negative reading)?
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  Elizabeth WalkerAug 22, 2025
  If the Hach Measuring Instruments shows a continuous underrange (negative reading), verify the accuracy of calibration standards and recalibrate the instrument. See Low Signal in Table 11. The cause might be that calibration standards are not in the correct order or incorrect dilution.

Summary

Section 2 General Information

Safety Information

General safety warnings and precautions for instrument operation.

Section 3 Installation

Mechanical Installation and Dimensions

Electrical Installation

Guidelines for safe and compliant electrical connections, including power and wiring.

Alarms, Relays, and Outputs

Sensor and Digital Output Connections

Instructions for connecting sensor cables and optional digital output cards.

Turbidimeter Installation and Sample Connections

Section 4 Operation

Keypad and Display Navigation

Instrument Setup and Configuration

Procedures for configuring instrument settings like contrast, language, time, and sensor names.

Output and Relay Configuration

Configuration of analog outputs, relay functions, and data logging options.

Section 5 System Startup

Initial Operation and Calibration

Steps for initial sensor connection, sample flow, and calibration procedures.

Instrument Verification and History

Section 7 Troubleshooting

Error Codes and Warnings

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