Hach 6120118 User manual

Catalog Number 6120118
Digital PC sc and RC sc ¾-inch
Combination pH/ORP Sensor
USER MANUAL
October 2005, Edition 4
©Hach Company, 2004–2005. All rights reserved. Printed in the U.S.A. eac/dp

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Table of Contents
Section 1 Specifications......................................................................................................................................... 5
Section 2 General Information............................................................................................................................... 7
2.1 Safety Information............................................................................................................................................... 7
2.1.1 Use of Hazard Information......................................................................................................................... 7
2.1.2 Precautionary Labels................................................................................................................................. 7
2.2 General Sensor Information................................................................................................................................ 8
2.2.1 Sensor Body Styles................................................................................................................................... 8
2.3 The Digital Gateway............................................................................................................................................ 9
2.4 Operating Precaution.......................................................................................................................................... 9
Section 3 Installation............................................................................................................................................ 11
3.1 Wiring the sc Sensor to the Digital Gateway..................................................................................................... 11
3.2 Connecting/Wiring the Digital Gateway to the sc100 Controller ....................................................................... 13
3.2.1 Connecting the Digital Gateway Sensor in a Non-hazardous Location................................................... 13
3.2.1.1 Attaching the Digital Gateway with a Quick-connect Fitting in a Non-hazardous Location............ 13
3.2.1.2 Hard-wiring the Digital Gateway to the sc100................................................................................ 14
3.2.2 Connecting the Digital Gateway to a sc100 Controller in a Hazardous Location .................................... 15
3.2.2.1 Attaching the Digital Gateway with a Quick-Connect Fitting in a Hazardous Location .................. 16
3.3 Connecting the Sensor to the sc1000............................................................................................................... 16
3.3.1 Connecting the Sensor using the Quick-connect Fittings........................................................................ 16
3.4 Mounting the Digital Gateway ........................................................................................................................... 17
Section 4 User Interface and Navigation ............................................................................................................ 19
4.1 Using the sc100 Controller................................................................................................................................ 19
4.1.1 Controller Display Features ..................................................................................................................... 20
4.1.2 Important Key Presses ............................................................................................................................ 20
4.2 Using the sc1000 Controller.............................................................................................................................. 21
4.2.1 Display Features...................................................................................................................................... 21
4.2.1.1 Using the Pop-up Toolbar.............................................................................................................. 21
4.2.1.2 Using the Menu Windows .............................................................................................................. 21
4.2.1.3 Navigating the Menu Windows....................................................................................................... 22
Section 5 Operation.............................................................................................................................................. 25
5.1 Sensor Setup .................................................................................................................................................... 25
5.2 Sensor Data Logging ........................................................................................................................................ 25
5.6 pH Calibration ................................................................................................................................................... 28
5.6.1 One Point Automatic Calibration.............................................................................................................. 28
5.6.2 Two Point Automatic Calibration .............................................................................................................. 28
5.6.3 One Point Manual Calibration.................................................................................................................. 29
5.6.4 Two Point Manual Calibration .................................................................................................................. 29
5.7 ORP Calibration................................................................................................................................................ 30
5.7.1 One-point Manual Calibration.................................................................................................................. 30
5.8 Concurrent Calibration of Two Sensors for pH and ORP.................................................................................. 30
5.9 Adjusting the Temperature ................................................................................................................................ 31
Section 6 Maintenance ......................................................................................................................................... 33
6.1 Maintenance Schedule ..................................................................................................................................... 33
6.2 Cleaning the Sensor ......................................................................................................................................... 34
Section 7 Troubleshooting................................................................................................................................... 35
7.1 Error Codes....................................................................................................................................................... 35
7.2 Warnings........................................................................................................................................................... 35

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Table of Contents
7.3 Troubleshooting the pH or ORP Sensor ............................................................................................................35
Section 8 Replacement Parts and Accessories..................................................................................................37
8.1 Replacement Items, Accessories, and Reagent and Standards.......................................................................37
Section 9 How to Order.........................................................................................................................................39
Section 10 Repair Service.....................................................................................................................................40
Section 11 Limited Warranty ................................................................................................................................41
Section 12 Compliance Information ....................................................................................................................43
B.1 pH Measurement Theory............................................................................................................................47
B.2 PID Controller Basics .................................................................................................................................48

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Section 1 Specifications
Specifications are subject to change without notice.
Table 1 Combination pH and ORP Sensor Specifications
Components Corrosion-resistant materials, fully-immersible probe with 4.6 m (15 ft) cable
Measuring Range (pH) 0 to 14 pH
Measuring Range (ORP) –2000 to +2000 mV
Measuring Range (Temperature) 0 to 105 °C (32 to 221 °F)
Probe Operating Temperature 0 to 105 °C (32 to 221 °F)
Probe Storage Temperature –30 to 70 °C (–22 to 158 °F); 0 to 95% relative humidity, non-condensing
Temperature Compensation pH: Pt 1000 ohm RTD
ORP: N/A
Accuracy (Analyzer only) pH: 0.1% of span
ORP: Limited to calibration solution accuracy (± 20 mV)
Stability (Analyzer only) 0.05% or span per 24 hours, non-cumulative
Repeatability (Analyzer only) 0.1% of span or better
Temperature Accuracy (Analyzer only) ±0.5 °C (±0.9 °F)
Temperature Drift (Analyzer only) Zero and Span: less than 0.03% of span per °C
Calibration Methods (Analyzer only) Two point automatic, one point automatic, two point manual, one point manual
Maximum Probe Immersion Depth/
Pressure Submersible to 107 m (350 ft)/1050 kPa (150 psi)
Sensor Interface Modbus from digital gateway
Probe Cable Length 4.6 m (15 ft)
Probe Weight Depends on selected sensor
Probe Dimensions See Figure 1 on page 8 through Figure 4 on page 9.
Table 2 Digital Gateway Specifications
Weight 145 g (5 oz)
Dimensions 17.5 x 3.4 cm (7 x 13/8in.)
Operating Temperature –20 to 60 °C (–4 to 140 °F)