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.
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Table of Contents Section 1 Specifications......................................................................................................................................... 5 Section 2 General Information ............................................................................................................................... 7 2.1 Safety Information ...............................................................................................................................................
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 ....................................
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.
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Section 2 General Information 2.1 Safety Information Please read this entire manual before unpacking, setting up, or operating this equipment. Pay attention to all danger and caution statements. Failure to do so could result in serious injury to the operator or damage to the equipment. To ensure that the protection provided by this equipment is not impaired, do not use or install this equipment in any manner other than that specified in this manual.
General Information 2.2 General Sensor Information Optional equipment, such as mounting hardware for the probe, is supplied with instructions for all user installation tasks. Several mounting options are available, allowing the probe to be adapted for use in many different applications. 2.2.1 Sensor Body Styles Combination pH and ORP sensors are available in three body styles: • Figure 1 Convertible Body Style (Figure 1 and Figure 2)— has ¾-in.
General Information Figure 3 Insertion Style Sensor with Domed Electrode 22.2 mm (0.875 inches) 149.9 mm (5.9 inches) Figure 4 Sanitary-style Sensor 22.2 mm (0.875 inches) 49.1 mm (1.96 inches) 22 mm (0.87 inches) 88.9 mm (3.5 inches) 187.3 mm (7.37 inches) 2.3 The Digital Gateway The digital gateway was developed to provide a means to use existing analog sensors with the new digital controllers.
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Section 3 Installation DANGER Only qualified personnel should conduct the tasks described in this section of the manual. DANGER Seul un technicien qualifié peut effectuer les tâches d'installation décrites dans cette section du manuel. The Combination pH/ORP Sensor can be used with either an sc100 or sc1000 controller. Refer to section 3.2 on page 13 for sc100 installation instructions and section 3.3 on page 16 for sc1000 installation instructions.
Installation Figure 5 Proper Wire Preparation and Insertion 1 2 1. Strip ¼-inch of insulation. Figure 6 2. Seat insulation against connector with no bare wire exposed. Wiring and Assembling the Digital Gateway 1 2 3 4 6 5 7 METAL BRAID RED WHT CLEAR BLU 8 9 10 11 12 1. Digital gateway front 7. Cord grip 2. O-ring 8. From sensor 3. Sensor wire connector 9. Insert wires into connector according to Table 3. Use the included 2 mm screwdriver (Cat. No.
Installation Table 3 Wiring the Digital Gateway (Cat. No. 6120800) Sensor Signal with Ground Rod1 Sensor (wire color) Sensor Signal without Ground Rod Digital Gateway Metal Braid2 Jumper 2 from J3-1 to J3-33 Ref J3-1 White Temp + Temp + J3-2 Red Temp – Temp – J3-3 Blue Ref Solution Ground J3-4 Clear Active/Measuring Active/Measuring J1-5 not used not used not used J1-6 1 Some applications require the use of an external ground rod with the combination electrode.
Installation Figure 7 Attaching the Digital Gateway using the Quick-connect Fittings 3.2.1.2 Hard-wiring the Digital Gateway to the sc100 Important Note: Hard-wiring the digital gateway to the sc100 is not an approved method for Class 1, Division 2 Hazardous Locations. 1. Disconnect power to the controller if powered. 2. Open the controller cover. 3. Disconnect and remove the existing wires between the quick-connect and terminal strip J5, see Figure 8 on page 15. 4.
Installation Table 4 Wiring the Sensor at Terminal Block J5 Terminal Number Terminal Designation Wire Color 1 Data (+) Blue 2 Data (–) White 3 Service Request No Connection 4 +12 V dc Brown 5 Circuit Common Black 6 Shield Shield (grey wire in existing quick disconnect fitting) Figure 8 Hard-wiring the Digital Gateway J1 J3 S1 ANALOG OUTPUTS U9 J5 PCB CONNECTOR NETWORK INTERFACE CARD NC COM NO RELAY 1 NC COM NO RELAY 2 1 2 3 4 5 6 + DATA 1 2 3 4 5 + OUT 2 – DATA SERVICE RE
Installation 3.2.2.1 Attaching the Digital Gateway with a Quick-Connect Fitting in a Hazardous Location The digital gateway is supplied with a keyed quick-connect fitting for easy attachment to the controller, see Figure 7 on page 14. For Hazardous Locations, a connector safety lock (Cat. No. 6139900) must be installed. Retain the connector cap to seal the connector opening in case the sensor must be removed. 1. Remove the connector cap from the sc100 controller.
Installation 3.4 Mounting the Digital Gateway The digital gateway is supplied with a mounting clip for mounting to a wall or other flat surface. See Figure 10 for dimensions. Use an appropriate fastener to secure it to the wall, see Figure 11. After the sensor is wired to the digital gateway and the two halves are threaded together, place the mounting clip over the center of the digital gateway and squeeze the clip together to secure. Figure 10 Digital Gateway Dimensions 34.29 mm (1.
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Section 4 User Interface and Navigation 4.1 Using the sc100 Controller The front of the controller is shown in Figure 12. The keypad consists of the eight keys described in Table 5. Figure 12 Front of the Controller 1 sc100 5 2 6 3 7 4 1. Instrument display 5. IrDA window 2. BACK key 6. HOME key 3. MENU key 7. ENTER key 4. RIGHT, LEFT, UP, and DOWN keys Table 5 Controller Key Functions/Features Number Key Function 2 Moves back one level in the menu structure.
User Interface and Navigation 4.1.1 Controller Display Features When a sensor is connected and the controller is in measurement mode, the controller automatically identifies the connected sensors and displays associated measurements. The display will flash on startup, when a sensor error has occurred, and when a sensor is being calibrated. An active system warning will cause the warning icon (a triangle with an exclamation point inside) to be displayed on the right side of the display. See Figure 13.
User Interface and Navigation 4.2 Using the sc1000 Controller The sc1000 is a touch screen application. Use your finger to touch keys and menu commands. In normal operation the touch screen displays the measured values for the sensors selected. 4.2.1 Display Features 4.2.1.1 Using the Pop-up Toolbar The pop-up toolbar provides access to the controller and sensor settings. The toolbar is normally hidden from view. To view the toolbar, touch the bottom-left of the screen.
User Interface and Navigation Figure 15 Main Menu 3 2 4 5 MENU SENSOR STATUS 1 6 SENSOR SETUP SYSTEM SETUP TEST/MAINT 7 1. Display Area 2. BACK 3. FORWARD 4. ENTER–confirms the entry or selection. 5. HOME–changes to the display of measured values. The pop-up toolbar cannot open from the menu window. To view the Main Menu from this display, touch the Home button and then the bottom of the screen. 6. UP–scrolls up 7. DOWN–scrolls down 4.2.1.
User Interface and Navigation Figure 16 Changing a Menu Item 1. Display Area 5. HOME–changes to the display of measured values. 2. BACK 6. UP–scrolls up 3. FORWARD 7. DOWN–scrolls down 4. ENTER–confirms the entry or selection. Figure 17 Keypad 1 2 3 1 2 3 : 4 4 5 6 / 5 7 8 9 0 6 1. Enters numbers or the character as shown on the button. 2. Moves the cursor one position to the left or to the right. 3. Increase/Decrease a number or letter at the cursor position.
User Interface and Navigation Figure 18 List Box 1 mg/l g/l ppm mE E m-1 FNU NTU 1. Scrolls up or down 2. CANCEL–cancels and entry. 3. ENTER–confirms a selection. Figure 19 2 3 Message window 1 2 4 COMMUNICATION ERROR 5 Ph [11f20030007] 6 1. Scrolls up or down. 2. Displays the messages or warnings. 3. Displays details on the selected entry. 4. This button changes back to the previous display. 5. ENTER–confirms an entry. 6. CANCEL–cancels an entry.
Section 5 Operation 5.1 Sensor Setup When a sensor is initially installed, the serial number of the Digital Gateway will be displayed as the sensor name. To change the sensor name refer to the following instructions: 1. Select Main Menu. 2. From the Main Menu, select SENSOR SETUP and confirm. 3. Highlight the appropriate sensor if more than one sensor is attached and confirm. 4. Select CONFIGURE and confirm. 5. Select EDIT NAME and edit the name. Confirm or cancel to return to the Sensor Setup menu. 5.
Operation 5.4 pH Sensor Setup Menu (continued) CONFIGURE (continued) REJECT FREQ Choose 50 or 60 Hz depending on the power line frequency for optimal noise rejection. Default is 60 Hz. FILTER Select 0–60 second signal averaging time. TEMP ELEMENT Select type of temperature element from the displayed choices. SELECT BUFFER Select the buffer type (standard 4, 7, 10 or DIN 19267) from the displayed choices.
Operation 5.5 ORP Sensor Setup Menu SELECT SENSOR (if more than one sensor is attached) CALIBRATE (Main Menu Item) 1 POINT MANUAL Calibration against a single known sample. TEMP ADJUST Adjust the displayed temperature by up to ± 15 °C. DEFAULT SETUP Restores the system to the original factory calibration. CONFIGURE EDIT NAME Enter up to a 10-digit name in any combination of symbols and alpha or numeric characters. SELECT SENSOR Choose from the displayed sensor type (pH or ORP).
Operation 5.6 pH Calibration The manufacturer offers one and two point automatic and manual calibrations for pH. An automatic calibration identifies the buffer table corresponding to the chosen buffer and automatically calibrates the probe after it stabilizes. A manual calibration is performed by placing the pH sensor in any buffer or sample with a known value and then entering that known value into the controller.
Operation 5.6.3 One Point Manual Calibration 1. From the Main Menu, select SENSOR SETUP and confirm. 2. Select the appropriate sensor if more than one is attached and confirm. 3. Select CALIBRATE and confirm. 4. Select 1 POINT MANUAL. Select the available Output Mode (Active, Hold, or Transfer) from the list box and confirm. 5. Move the clean probe to solution and confirm to continue. 6. Confirm when stable. Edit the solution value using the keypad and confirm. 7. Confirm when stable.
Operation 5.7 ORP Calibration 5.7.1 One-point Manual Calibration The manufacturer offers a one point manual calibration for ORP. The value of the sample used in the manual calibration may be determined by laboratory analysis or comparison reading. 1. From the Main Menu, select SENSOR SETUP and confirm. 2. Select the appropriate sensor if more than one is attached and confirm. 3. Select CALIBRATE and confirm. 4. Select 1 POINT MANUAL CAL.
Operation 5.9 Adjusting the Temperature View or change the temperature using the steps below: 1. From the Main Menu, select SENSOR SETUP and confirm. 2. Select the appropriate sensor if more than one is attached and confirm. 3. Select CALIBRATE and confirm. 4. Select TEMP ADJUST and confirm. 5. Select MEASURED TEMP and confirm. 6. The temperature will be displayed. Select the temperature to edit and confirm.
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Section 6 Maintenance DANGER Only qualified personnel should conduct the tasks described in this section of the manual. DANGER Seul un technicien qualifié peut effectuer les tâches d'installation décrites dans cette section du manuel. DANGER Explosion hazard. Do not connect or disconnect equipment unless power has been switched off or the area is known to be non-hazardous. DANGER Risque d’explosion.
Maintenance 6.2 Cleaning the Sensor CAUTION Before cleaning with acid, determine if the chemical reaction between the acid and the sample will create a hazardous chemical reaction. (For example, do not put a sensor that is used in a cyanide bath directly into a strong acid for cleaning because this chemical combination may produce poisonous cyanide gas.) DANGER Acids are hazardous. Always wear appropriate eye protection and clothing in accordance with material safety data sheet recommendations. 1.
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 this sensor will be held. The following conditions will cause the sensor reading to flash: • Sensor calibration • Relay timer washing cycle • Loss of communication Highlight the Sensor Diag menu and press ENTER. Highlight Errors and press ENTER to determine the cause of the error.
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Section 8 Replacement Parts and Accessories 8.1 Replacement Items, Accessories, and Reagent and Standards Item Description QTY Catalog Number Instruction manual, Combination pH System, English each 6120118 Cable, sensor extension, 1 m (3 ft) each 6122400 Cable, sensor extension, 7.
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Section 9 How to Order U.S.A. Customers By Telephone: 6:30 a.m. to 5:00 p.m. MST Monday through Friday (800) 227-HACH (800-227-4224) By Fax: (970) 669-2932 By Mail: Hach Company P.O. Box 389 Loveland, Colorado 80539-0389 U.S.A. Ordering information by e-mail: orders@hach.
Section 10 Repair Service Authorization must be obtained from Hach Company before sending any items for repair. Please contact the Hach Service Center serving your location. In the United States: Hach Company Ames Service 100 Dayton Avenue Ames, Iowa 50010 (800) 227-4224 (U.S.A. only) FAX: (515) 232-3835 In Canada: Hach Sales & Service Canada Ltd. 1313 Border Street, Unit 34 Winnipeg, Manitoba R3H 0X4 (800) 665-7635 (Canada only) Telephone: (204) 632-5598 FAX: (204) 694-5134 E-mail: canada@hach.
Section 11 Limited Warranty Hach Company warrants its products to the original purchaser against any defects that are due to faulty material or workmanship for a period of one year from date of shipment unless otherwise noted in the product manual. In the event that a defect is discovered during the warranty period, Hach Company agrees that, at its option, it will repair or replace the defective product or refund the purchase price excluding original shipping and handling charges.
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Section 12 Compliance Information Hach Company certifies this instrument was tested thoroughly, inspected and found to meet its published specifications when it was shipped from the factory. The Model sc100 Controller/sc1000 Controller and the pH Combination sensor has been tested and is certified as indicated to the following instrumentation standards: Product Safety UL 61010A-1 (ETL Listing # 65454) CSA C22.2 No. 1010.1 (ETLc Certification # 65454) Certified by Hach Co. to EN 61010-1 Amds.
Compliance Information Canadian Interference-causing Equipment Regulation, IECS-003, Class A Supporting test records by Hewlett Packard, Fort Collins, Colorado Hardware Test Center (A2LA # 0905-01) and certified compliance by Hach Company. This Class A digital apparatus meets all requirements of the Canadian InterferenceCausing Equipment Regulations. Cet appareil numèrique de la classe A respecte toutes les exigences du Rëglement sur le matÈriel brouilleur du Canada.
Appendix A Modbus Register Information Table 8 Sensor Modbus Registers Register # Data Type Length R/W SensorMeasTag 40001 Integer 1 R Sensor measurement tag Measurements pHMeas 40002 Float 2 R pH /ORP measurement Tags TempMeasTag 40004 Integer 1 R Temperature measurement tag Measurements TempDegCMeas 40005 Float 2 R Temperature measurement Configuration SensorName 40007 String 6 R/W Sensor name Tags FuncCode 40013 Integer 1 R/W Function code tag Tags NextState
Modbus Register Information Table 8 Sensor Modbus Registers Register # Data Type Length R/W Description CalWarningDays 40076 Integer 1 R/W Calibration warning days SensorWarningDays 40077 Integer 1 R/W Sensor warning days Group Name Tag Name Configuration Configuration 46
Appendix B General pH Information B.1 pH Measurement Theory pH is the negative logarithm of the hydrogen ion activity and a measure of the acidity or alkalinity of a solution. pH = –log A[H+] pH is normally measured using a glass electrode and a reference electrode. The glass electrode acts as a transducer, converting chemical energy (the hydrogen ion activity) into an electrical energy (measured in millivolts).
General pH Information B.2 PID Controller Basics A pH control loop operates as follows: The pH meter measures the value of the pH in the effluent, and, if the pH is different from the setpoint, the controller actuates the reagent pump (or valve) that adds reagent to a mixing tank. The added reagent adjusts the pH value of the process.
General pH Information Integral The integral value is used to reduce the steady state error, between the process value and the setpoint, to zero. For example, assume a process can be manually controlled at a level of pH 8.0 by sending a 35% control output level to a reagent pump. Now, say that the system is set up for the controller to provide proportional only control, with the controller setpoint set to pH 8.0 and the proportional band set to pH 1.0. Note that the nearer the process gets to the pH 8.
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Index B M Buttons List box .............................................................. 23 Toolbar .............................................................. 21 Maintenance Schedule ............................................ 33 Menu command Marking ........................................................ 21, 22 Menu windows ......................................................... 21 C Cleaning Sensor ............................................................... 34 Compliance Information .....
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