EC1000 PROCESS
pH/ORP SYSTEM
INSTRUCTION MANUAL
48275-18
© Hach Company, 1994-1997. All rights are reserved. Printed in the U.S.A. al/dk 7/97 3ed
2
CERTIFICATION
Hach Company certifies this instrument was tested thoroughly, inspected, and found to
meet its published specifications when it was shipped from the factory.
The EC1000 Process pH/ORP System has been tested and is certified as indicated to the
following ins trumentation standards:
Product Safety
Listed by ETL to UL Standard 3101-1 (Listing # H0492805390)
Certified by ETL to CSA Standard C22.2 No. 142 (ETLc Certification # H 0492805390)
Certified by Hach Company to EN 61010-1 (IEC1010-1), supporting test records by
Intertek Testing Services
Immunity
EN 50081-2 (European Generic Immunity Standard) per 89/336/EEC EMC: Supporting
test records Amador (TUV Product Services), certified compliance by Hach Company.
Required Standard/s include:
IEC 801-2 & IEC 1000-4-2 Electro-Static Discharge
IEC 801-3 Radiated RF Electro-Magnetic Fields*
IEC 801-4 Electrical Fast Transients/Burst
Emissions
Emissions per 89/336/EEC EMC: Supporting test records by Intertek Tes ting Services
(ETL), certified compliance by Hach Company.
Required Standard/s include:
EN 55011 (CISPR 11) Emissions, Class B Limits
CANADIAN INTERFERENCE-CAUSING EQUIPMENT REGULATION, IECS-003, Class A
Supporting test records by Intertek Testing Services (ETL), certified compliance by
Hach Company.
This Class A digital apparatus meets all requirements of the Canadian InterferenceCausing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le
matériel brouilleur du Canada.
FCC PART 15, Class "A" Limits:
Supporting test records by Intertek Testing Services (ETL), certified compliance by
Hach Company.
This device complies wit h Par t 15 o f the F CC Rul e s. Op er at ion is s ubj ec t to th e following
two conditio ns:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
* Electromagnetic Radiation of 3 Volts /meter or greater can cause instrument inaccuracy. For complete accuracy details in an
RF environment, refer to the Supplementary Compliance Information in this manual.
3
CER TIFICATION, continued
Changes or modifications to this unit not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against ha rmful interference w hen the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not ins ta ll ed an d use d in accordance with the instruction manual, may caus e
harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference, in which case the user will be required to
correct the interference at his own expense.
Shielded cables must be used with this unit to ensure compliance with the Class A FCC
limits. Because this instrument operates on and generates radio frequency energy,
interference to radio and television reception may occur. If such interference does occur,
the operator should take the necessary steps to correct the interference. The following
techniques of reducing the interference problems are applied easily.
1. Disconnect power from the EC1000 Controller to verify that it is the source of
the interference.
2. If the EC1000 Controller is plugged into the same outlet as the device with which it is
interfering, try another outlet.
3. Move the EC1000 Controller away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving the interference.
5. Try combinations of the above.
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TABLE OF CONTENTS
CERTIFICATION ..........................................................................................................................................................3
SPECIFICATIONS ........................................................................................................................................................ 9
SAFETY PRECAUTIONS .......................................................................................................................................... 13
OPERATION .............................................................................................................................................................. 15
SECTION 1 GENERAL INFORMATION ........................................................................................................... 17
1.1 Instrument Description ...........................................................................................................................................17
1.2 EC1000 pH/ORP Controller ...................................................................................................................................17
1.3 Electrolyte Pump .................................................................................................................................................... 17
1.4 Hach One Process pH Electrode ............................................................................................................................ 21
1.4.1 Sodium Error ..............................................................................................................................................21
1.5 Hach One ORP Electrode .......................................................................................................................................21
1.6 Industrial Process pH Electrode .............................................................................................................................22
1.7 Sample Handling System .......................................................................................................................................22
1.7.1 Submersible ................................................................................................................................................ 22
1.7.2 Flow-Thru Cell ...........................................................................................................................................22
1.7.3 In-Line ........................................................................................................................................................ 22
1.8 Principle of Operation ............................................................................................................................................ 23
SECTION 2 OPERATION ......................................................................................................................................25
2.1 Operating the User-Programmable Setup ...............................................................................................................25
2.1.1 Moving Around the Menu .......................................................................................................................... 25
2.1.2 Editing a Setup Value .................................................................................................................................25
2.1.3 Restoring Default Settings .......................................................................................................................... 27
2.2 Setup Menu ............................................................................................................................................................. 28
2.2.1 Alarms ........................................................................................................................................................ 28
2.2.2 Recorder Output ......................................................................................................................................... 29
2.2.3 PID Output ..................................................................................................................................................30
2.2.4 Recorder 2 ................................................................................................................................................... 33
2.2.5 Initial Setup .......................................... ......... ..............................................................................................33
2.2.5.1 Temperature Compensation Setup .................................................................................. .............33
2.2.6 Keylock ....................................................................................................................................................... 35
2.2.7 Reference Solution Timer ...........................................................................................................................36
2.2.8 Warnings ..................................................................................................................................................... 36
2.3 Calibration .............................................................................................................................................................. 37
2.3.1 pH Calibration ............................................................................................................................................38
2.3.1.1 Two-Point Calibration with Auto Recognition of Hach Buffers .................................................39
2.3.1.2 One-Point Grab Sample Calibration ............................................................................................ 40
2.3.1.3 Calibration Procedure Variations ................................................................................................. 40
2.3.1.4 One Point Calibration with a Buffer ............................................................................................ 41
2.3.1.5 Calibration Review .......................................................................................................................41
2.3.2 Temperature Calibration ............................................................................................................................. 41
2.3.3 ORP Calibration/mV Zero .......................................................................................................................... 42
2.3.3.1 Preamp Zero .................................................................................................. ......... ...................... 42
2.3.3.2 ORP Electrode Check ..................................................................................................................43
2.3.3.3 mV Offset ..................................................................................................................................... 43
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TABLE OF CONTENTS, continued
SECTION 3 SERIAL INTERFACE .......................................................................................................................45
3.1 Optional Serial Interface Board ..............................................................................................................................45
3.2 Data Communications Format/Setup ......................................................................................................................45
3.3 Print Format ............................................................................................................................................................45
3.4 Remote Input Commands ............................................... ........................................................................................46
SECTION 4 PID CONTROL ..................................................................................................................................49
4.1 pH Controller Basics ...............................................................................................................................................49
4.2 Instrument Settings .................................................................................................................................................49
4.2.1 Set Point ......................................................................................................................................................49
4.2.2 Dead Band ...................................................................................................................................................49
4.2.3 Preset ........................................................................................................................................................... 49
4.3 Gain .........................................................................................................................................................................49
4.3.1 Reset (Integral) ............................................................................................................................................52
4.3.2 Rate (Derivative) ................................................. ......... ...............................................................................52
4.3.3 Curve ........................................................................................................................................................... 52
INSTALLATION/MAINTENANCE .....................................................................................................................55
SECTION 5 INSTALLATION ...............................................................................................................................57
5.1 Unpacking the Instrument .......................................................................... ........................... ......... ......... ................57
5.2 Industrial Process pH Electrode Preparation ..........................................................................................................57
5.3 Mounting the Controller .........................................................................................................................................57
5.3.1 Panel Mounting ...........................................................................................................................................57
5.3.2 Wall Mounting ............................................................................................................................................59
5.3.3 Pole Mounting .............................................................. ......... ......................................................................59
5.4 Mounting the Pump .................................................................................................................................................59
5.5 Installing the pH/ORP Electrode ............................................................................................................................60
5.5.1 In-Line Electrode Installation .....................................................................................................................62
5.5.2 Submersible Sensor Installation ..................................................................................................................62
5.5.3 Flow-Thru Cell Installation .........................................................................................................................62
5.6 Wiring the Meter .....................................................................................................................................................63
5.6.1 Wire Preparation .........................................................................................................................................64
5.6.2 Power ...........................................................................................................................................................65
5.6.2.1 Line Voltage Selection for Meter ................................................................................................. 66
5.6.3 Alarms .........................................................................................................................................................66
5.6.4 Recorder and Controller ..............................................................................................................................66
5.6.5 Electrode Wiring .........................................................................................................................................67
5.6.6 Electrode Output Connections ....................................................................................................................67
5.7 Pump Wiring ...........................................................................................................................................................68
5.7.1 Line Voltage Selection for Electrolyte Pump .............................................................................................69
SECTION 6 BASIC START-UP ..............................................................................................................................71
6.1 Introduction .............................................................................................................................................................71
6.2.1 Assembling the Electrolyte Line .................................................................................................................71
6.2.2 Connection to the Pump Module .................................................................................................................71
6.2.3 Connection to the pH Electrode ..................................................................................................................71
6.3 Purging the System .................................................................................................................................................72
6.4 Calibration ...............................................................................................................................................................73
SECTION 7 SERIAL INTERFACE .......................................................................................................................75
7.1 Installation ...............................................................................................................................................................75
7.2 RS-232C Interface Configuration ...........................................................................................................................77
7.3 Current Loop Configuration ...................................................................................................................................77
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TABLE OF CONTENTS, continued
SECTION 8 ELECTRODE AND PUMP MAINTENANCE ............................................................................... 81
8.1 Electrode Maintenance ...........................................................................................................................................81
8.1.1 General Electrode Maintenance .................... ......... ..................................................................................... 81
8.1.2 Removing Existing Electrode ..................................................................................................................... 81
8.1.3 Sensor Replacement ................................................................................................................................... 81
8.1.4 Replacing Electrolyte ................................................................................................................................. 82
8.1.5 Crystal Formation in Reference Tube ........................................................................................................84
8.1.6 Purging the System ..................................................................................................................................... 84
8.1.7 Storage and Conditioning ...........................................................................................................................84
8.1.7.1 pH Electrode Storage and Conditioning ......................................................................................84
8.1.7.2 ORP Electrode Storage and Conditioning ....................................................................................84
8.1.7.3 Industrial pH Electrode Shelf Life and Storage ...........................................................................86
8.1.8 pH Electrode Cleaning ................................................................................................................................ 86
8.1.9 ORP Electrode Cleaning .............................................................................................................................87
8.1.10 Industrial pH Electrode Cleaning ...............................................................................................................87
8.2 Pump Maintenance .................................................................................................................................................87
8.2.1 Changing Pump Tubing .............................................................................................................................. 87
8.3 Fuse Replacement ................................................................................................................................................... 88
8.3.1 Meter Fuse Replacement ............................................................................................................................ 88
8.3.2 Pump Fuse Replacement ............................................................................................................................ 90
8.4 Pump Motor Replacement ......................................................................................................................................90
SECTION 9 TROUBLESHOOTING .....................................................................................................................91
9.1 Troubleshooting the EC1000 Controller ................................................................................................................91
9.1.1 Test Diagnostic Menu .................................................................................................................................91
9.1.2 Error Codes .................................................................................................................................................94
9.1.3 System Warnings ........................................................................................................................................ 95
9.2 Troubleshooting the pH Electrode ......................................................................................................................... 96
9.3 Troubleshooting the ORP Electrode ............................................................................................................... 98
SECTION 10 SCHEMATICS ................................................................................................................................. 103
GENERAL INFORMATION ...............................................................................................................................107
REPLACEMENT PARTS ......................................................................................................................................... 109
HOW TO ORDER ......................................................................................................................................................113
REPAIR SERVICE .................................................................................................................................................... 114
APPENDIX A Process pH Electrode Without Internal Preamp ...........................................................................115
APPENDIX B Supplemental Compliance Information ......................................................................................... 117
INDEX ......................................................................................................................................................................... 119
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8
SPECIFICATIONS
(Specifications subject to change without notice.)
CONTROLLER SPECIFICATIONS
Ranges: pH: -2 to 16 pH; mV: -2000 to +2000 mV; Temperature: -5 to +105 °C
Accuracy*: pH: ±0.02 pH; mV: ±1.0% of reading, ±35 mV non-calibrated;
Temperature: ±1.5 °C before calibration with electrode, ±0.4 °C after calibration with
electrode.
Resolution: pH: 0.01 pH; mV: 0.1 mV; Temperature: 0.1 °C
Repeatability: pH: ±0.02 pH; mV: ±0.1 mV; Temperature: ±0.2 °C
Temperature Calibration: 1 or 2 point with zero and slope adjustments
Temperature Compensation: -5 to +105 °C for Nearnst equation (auto/manual);
0 to 60 °C for auto buffer recognition
Solution Temperature Correction: Corrected to 25 °C, 0.1 to -0.1 pH units/ °C slope
Operating Temperature: -10 to 60 °C
Storage Temperature: -40 to 60 °C
Humidity Range: 5 to 90% RH non-condensing
Relative mV Adjus tment: The mV zero may be offset to any point in the ±2000 range
Alarms: Alarms 1 and 2: Usable in any of operating modes, (pH/mV/Temperature).
Programmable for either low or high set point alarm. Alarm relays SPDT with contacts
rated at 5A resistive load at 30 Vrms (42.4 Vpk).
Recorder O utput: Isolated 4-20 mA (adjustable to 0-20 mA at 900 ohms)
Controller Output: Proportional, Integral, Derivative. Addi tiona l resi stors can b e used to
provide 0 to 10 V, 0 to 1 V, or 0 to 100 mV outputs.
Input/Output (optional): RS-232C and 20 mA current loop
Signal Average: 0 to 10 seconds
Reading Update: Every 0.4 seconds
Power Requirements: 115/230 Vac (±17%), 50/60 Hz, 8 watts
Controller Enclosure: NEMA 4X/IP66 (rear connections). Suitable for 1/2- inch co nduit.
Wall, panel or pole mounted. For indoor use.
Controller Dimensions: 14.4 cm x 14.4 cm x 12.5 cm deep (5.67" x 5.67" x 4.9" deep).
Panel cutout size: 14 cm x 14 cm (5.5" x 5.5")
* Intermittent Electromagnetic Radiation of 3 Volts per meter or greater may cause measurement inaccuracy. For complete
accuracy details in an RF environment, see the Supplemental Compliance Information in this manual.
9
SPECIFICATIONS, continued
Hach One® PROCESS pH SPECIFICATIONS
pH Range: 0 to 14 pH
Accuracy*: pH: ±0.02 pH; Temperature: ±1.5 °C before calibration, ±0.4 °C after
calibration
Repeatability: pH: ±0.02 pH (calibrated at 25 °C and measured at 25 °C);
Temperature: ±0.2 °C
Temperature Range: 0 to 60 °C
Pressure Range: 0 to 35 psi (241 kPa)
Slope: 58 mV± 2 mV/pH units at 28 °C
Reference Element: Ag/AgCl double junction
Electrode Diameter: 28.6 mm (1.125") at tip
Electrode Length: 20.3 cm (8")
Reference Tubing Length: 6.1 m (20 feet) optional 50 feet
Cable Length: 6.1 m (20 feet). Expandable to 1000 feet
Submersion Application: Operational to a depth of 40 feet
Electrical Output: Two 4-20 mA current loops, directly proportional to mV and
temperature
Electrode Housing: Kynar (lower body)/Noryl (polyphenylene oxide) (upper body)
Hach One ORP ELECTRODE SPECIFICATIONS
mV Range: -2000 to 2000 mV
Temperature Range: 0 to 60 °C
Pressure Range: 0 to 35 psi (241 kPa)
Accuracy*: mV: ±10 mV; Temperature: ±1.5 °C before calibration, ±0.4 °C after
calibration
Repeatability: mV: ±2 mV; Temperature: ±0.2 °C
Sensing Element: Platinum disc (99.998% pure)
Reference Element: Ag/AgCl double junction
Reference Potential: 32 ±5 mV vs. SCE
Electrode Diameter: 28.6 mm (1.125") at tip
Electrode Length: 20.3 cm (8")
Reference Tubing Length: 6.1 m (20 feet) optional 50 feet
Cable Length: 6.1 m (20 feet). Expandable to 1000 feet
Submersion Application: Operational to a depth of 40 feet
Electrical Output: Two 4-20 mA current loops, directly proportional to mV and
Temperature
Electrode Housing: Kynar (lower body)/Noryl (polyphenylene oxide) (upper body)
* Calibrated at 25 °C and measured at 25 °C and at atmospheric pressure.
10
SPECIFICATIONS, continued
INDUSTRIAL PROCESS pH ELECTRODE SPECIFICATIONS
pH Range: 0 to 12 pH
Reproducibility: ±2% of reading
Temperature and Pressure Range: 0 to 80 °C at 0 to 100 psig; 0 to 100 °C at
ambient pressure
Slope: (pH 4 to pH 7) @ 25 °C: >170 mV
Reference Element: Ag/AgCl
Electrode Diameter: 28.2 mm (1.11") at tip
Electrode Length: 175 mm (6.9")
Electrode Housing: CPVC
PUMP MODULE SPECIFICATIONS
Pressure Range: 0 to 35 psi (241 kPa)
Operating Temperature Range: -20 to 60 °C
Humidity Range: 5 to 90% RH non-condensing
Reagent Usage: Reference solution capacity for a minimum of 1 month of operation
Power Requirements: 115/230 Vac (±17%), 50/60 Hz, 9 VA, 8 watts
Enclosure: NEMA 4X/IP66—Wall mounting, with 1/2-inch NPT for conduit
connections. For indoor use.
MOUNTING KIT SPECIFICATIONS
SUBMERSION APPLICATION
Maximum Submersion Depth: 40 feet (due to restrictions on reference tubing length)
Maximum Velocity at Electrode Tip: 15 km/hour
IN-LINE APPLICATION
Maximum Pressure: 35 psi (241 kPa)
Maximum Flow Rate: 40 L/minute
Minimum Flow Rate: 10 mL/minute
FLOW-THRU CELL APPLICATION
Maximum Flow Rate: 750 mL/m inu te
Minimum Flow Rate: 1 mL/minute
11
12
SAFETY PRECAUTIONS
Before attempting to unpack , set up, or oper ate this instrument, please read this entire
manual. Pay particula r atte ntion to all wa rnings , cautio ns and note s. F ail ure to do so cou ld
result in serious injury to the operator or damage to the equipment.
To ensure the protection provided by this equipment is not impaired, this equipment
MUST NOT be installed or used in any manner other than that which is specified in
this manual.
Use of Hazard Information
If multiple hazards exist, the signal word corresponding to the greatest hazard shall
be used.
DANGER
Indicates a potentially or imminently hazardous s ituation which, if not avoided, could r esult in
death or serious injury
CAUTION
Indicates a potentially hazardous situation that may result in minor or moderate injury
NOTE
Information that requires special emphasis
Precautionary Labels
Please pay particular attention to labels and tags attached to the instrument. Personal
injury or damage to the instrument could occur if not observed.
This symbol, if noted on the instrument, references the instruction manual for
operational and/or saf et y info rmation.
Section 5.4 Installing the pH/ORP Electrode
Section 5.5 Wiring Meter
Section 5.5.2 Power
Section 5.6 Wiring Pump
Section 7.1 Installation
Section 8.1.7 pH Electrode Cleaning
Section 8.1.8 ORP Electrode Cleaning
Section 8.1.9 Industrial pH Electrode Cleaning
13
14
OPERATION
WARNING
Handling chemical samples, standards, and reagents can be dangerous. Review the necessary
Material Safety Data Sheets and become familiar with all safety procedures before handling
any chemicals.
ADVERTENCIA
La manipulación de muestras químicas, patrones y reactivos puede ser peligrosa. Antes de
manipular cualquier productor químico, conviene leer las Fichas Técnicas de Seguridad y
familiarizarse con los procedimientos de sugeridad.
ADVERTÊNCIA
A manipulação de amostras, padrões e reagentes químicos pode se r perigosa. Reveja as necessárias
Fichas Técnicas de Segurança do Material e familiarizese com os procedimentos de segurança
antes de manipular quaisquer substãncias químicas.
ATTENTION
La manipulation des écha ntillons c himiqu es, étalo ns et réact ifs p eut êt re dan gereuse . Li re le s fi ches
de données de sécurité des produits nécessaires et se familiariser avec toutes les procédures de
sécurité av ant de manipuler tout produ it chimique.
WARNHINWEIS
Da das Arbeiten mit chemikalischen Proben, Standards, Reagenzien und Abfällen mit Gefahren
verbunden ist, empfiehlt die Hach Company dem Benutzer dieser Produkte dringend, sich vor der
Arbeit mit sicheren Verfahrensweisen und dem richtigen Gebrauch der Chemikalien oder
Biogefahrgut vertraut zu machen und alle entsprechenden Materialsicherheitsdatenblätter
aufmerksam zu lesen.
15
16
SECTION 1 GENERAL INFORMATION
1.1 Instrument Description
The EC1000 Process pH/ORP Monitoring System consists of the Series EC1000
Controller, a Hach One Pump Module, and a Hach One Process pH or ORP Electrode
assembly. The system monitors a sample stream for its pH value within the range of 0 to
14, or its millivolt potential from -2000 to +2000 mV, and its temperature ranging from
0 to 60 ° C. The sys tem also indica tes when pr eset hi gh and low alarm limits are exceeded,
provides relay closures for external devices, and provides output currents to drive a
recorder and remote process control equipment. Each of these items are described in
detail in the following sections.
1.2 EC1000 pH/ORP Controller
The controller is menu driven with PID capability and is housed in a NEMA 4X/IP66
enclosure (see Figure 1 on page 18). It is set up to receive two current loop inputs from a
pH or ORP probe preamplifier, and to provide a continuous readout of the sample pH or
millivolt value as well as the sample temperature. Output capabilities of the controller
include two 4-20 mA outputs for recording and controlling pumps and optional RS-232C
and 20 mA current loop serial port. Alarm features include user programmable Alarm 1
and Alarm 2 setpoint selections for any one of the operating modes (pH, millivolt, or
temperature) with SPDT relay contacts. The alarm can be a combination of
operating modes:
1.3 Electrolyte Pump
Note: The electrolyte
pump is not used with the
self-pressurized Industrial
Process pH Electrode with
self-pressurized
electrolyte, Cat. No.
48276-00. See Section 1 .6
Industrial Process pH
Electrode.
(Example 1)
Alarm 1-pH High Alarm
Alarm 2-Temperature High Alarm
(Example 2)
Alarm 1-pH Low Alarm
Alarm 2-Temperature Low Alarm
The EC1000 Controller can be mounted up to 1000 feet from the electrode. The pump
module can be mounted up to 50 feet from the electrode.
The pump used on this system is a low pressure linear peristaltic pump, whi ch opera tes up
to 35 psi. The pump is housed in a NEMA 4X enclosure, and allows for a maximum of
50 feet separation from the electrode. It continuously pumps electrolyte through a freeflowing junction in the electrode (500 mL of electrolyte [Cat. No. 24291-49]) lasts
approximately 30 days). The pump module contains a refillable electrolyte reservoir (see
Figure 2 on page 20).
17
Figure 1 Controller Front Panel
18
Table 1 Controller Front Panel
Item Name Function
1 LED Display Main display field. Consists of eight 14-segment alpha-numeric 0.54″ high red LED characters.
During normal operation, this field displays either the pH or mV value (depending on the mode of
operation selected). This field also displays menu messages, edit menu values, and error messages.
See
Figure 1
2 Secondary
Display Field
3 SETUP key This key enters the setup menu. The setup is entered when it is pressed.
4 pH/mV key During normal operation (instrument displaying pH/mV), this key toggles the reading between
5 ENTER key This key, within the menus, either moves a level deeper into the menus, or accepts an edited selection.
6 CLEAR key This key, within the menus, either clears changes in an edit portion of a menu, or backs up one menu
7 RIGHT
ARROW key
8 HOLD/DOWN
ARROW key
The secondary display fiel d consists of three 7-segment numeric 0.3″ high green LED digits.
During normal operation, this field displays temperature. In the setup menu, this field displays
abbreviations to help indicate which branch of the setup menu the operator is in. See
pH and mV. If the instrument is in any of the menus, pressing this key returns the instrument to
normal operation.
leve l. If this i nstrument i s in an ed it portion of a menu s elect ion, and the v alu e is cha nged, th en this k e y
restores the original value. Otherwise, this key causes the menu selection to back up one level; if the
menu is at the top level, this key returns the instrument to normal operation (instrument
displaying pH/mV).
This key, in an edit portion of a menu selection, selects the next digit to the right to edit. The selected
digit flashes. When the instrument is in one of the non-editing portions of the calibration/setup menus,
or in normal operation (instrument displaying pH/mV), this key is not valid; if pressed, an INVALID
message flashes on the main display.
During normal operation (instrument displaying pH/mV), this key functions as a hold. When pressed,
the outputs (alarm relays, recorder, and controller outputs) alternately hold at the current value, or
release to normal operation. When the outputs are held, the first character in the main display
flashes an H. (
appear.
the instrument is in one of the calibration/setup menus, this key scrolls down through the menu
selections. When the instrument is in an edit portion of a menu selection, this key decreases the
selected (flashing) digit.
9 ALARM ACK/
UP ARROW
key
10 CAL key This key enters the calibration menu. From th is menu, the pH electrode, temperature probe, and mV
11 System warning Red LED. Indicates a probe failure or controller malfunction. Refer to Table 4 on page 42 for specific
12 Alarm 2 Red LED. User programmable setpoint alarm. See
13 Alarm 1 Red LED. User programmable setpoint alarm. See
During normal operation (instrument displaying pH/mV), this key functions as an alarm acknowledge.
When pressed, the alarms are alternately disabled or enabled. When the alarms are disabled, the
three alarm indicators flash, and the alarm relays are in the non-alarm state. After the alarms are
disabled for 30 minutes, they automatically enable. When the instrument is in one of the
calibration/set up m en us, this key scrolls up through the me n u selections. When the instrument is in an
edit portion of a menu selection, this key increases the selected (flashing) digit.
offset can be calibrated, and the calibration reviewed.
system warnings tha t appe ar on t he ma in LED dis pla y. For most system warnings , th e use r mu st que ry
the system to determine the warning. See
.
Figure 1.
Note: The H appears only during normal operation; in the menus, the H does not
) After the outputs are in the hold state for 30 minutes, they automatically release. When
Figure 1
.
Figure 1.
Figure 1.
19
Figure 2 Pump Module
20
1.4 Hach One Process pH Electrode
The Hach One pH Electrode features a continuous, free-flowing reference junction to
assure a constant long-lasting reference potential. The electrode contains a replaceable
pH glass sensor (in bulb or flat configuration) a reference half cell, a temperature sensor,
and an internal preamp. The internal preamp produces two current loop signals, one for
mV and the other for temperature. The preamp allows for up to 1000 feet of separation
between the electrode and meter, and is operable up to a depth of 40 feet. The
electrode housing works in any of the sample handling systems described in Section 1.7
Sample Handling System.
1.4.1 Sodium Error
Acid error is ne gligibl e; neg ati v e sodium er ror , usually pr esent in al kaline s olutions, is lo w
even at pH values as high as 12. To determine the sodium error in pH units, measure the
apparent pH and sodium concentration of the test solution and determine the error from
Figure 3. Locate the point (on the appropriate pH horizontal grid line) representing the
sodium concentration based on the extrapolation between the 229, 2,290, and
22,900 = mg/L Na plots. Add the vertical grid line at that point to the apparent pH meter
reading. For example, a sample that reads pH 12 with a Na+ concentration of 0.5M has a
negative sodium error of approximately 0.12 pH units. Therefore, the actual pH of the
sample is 12.12.
Figure 3 Sodium Ion Error Graph
1.5 Hach One ORP Electrode
The Hach One ORP Electrode also features the continuous, free-flowing reference
junction, a temperature sensor, and a preamp. It is housed in the same electrode body as
the pH flat configured electrode (see Figure 4 on page 22). The replaceable sensor is a
Platinum disc sealed in glass. Select the mV readout for ORP applications.
TYPICAL SODIUM ERROR FOR
HACH ONE COMBINATION pH
ELECTRODE (AT 25 °C)
21
Figure 4 Electrodes
1.6 Industrial Process pH Electrode
The Hach Industrial pH Electrode’s unique design does not use an electrolyte pump and
does not have a replaceable sensor. The low-maintenance electrode has self-pressurized
electrolyte and a flat electrode. The electrode features high temperature and pressure
resistance and is designed for traditional applications such as water and wastewater
analysis. The electrode is housed in a CPVC body with a built-in preamplifier and has the
same size and shape to fit all of the mounting configurations described in SECTION 5,
INST ALLATION.
1.7 Sample Handling System
Three sampling techniques can be used with the EC1000 pH/ORP System: submersible,
flow-thru cell, and in-line inst allations. Mounting kits are available fo r the different
applications. Refer to SECTION 5, INSTALLATION for detailed installation information.
1.7.1 Submersible
For the submersible application, mount the electrode to the end of a pipe using the
Submersible Mounting Kit (Cat. No. 46401-00), see Figure 15 on page 61, and place it in
a tank or non-flowing sample.
1.7.2 Flow-Thru Cell
The Flow-Thru Cell provides for atmospheric sampling of the process water, and easy
installation and removal of the electrode. Mounting Kit (Cat. No. 46403-00) is required,
see Figure 16 on page 61.
1.7.3 In-Line
For the in-line application, place the electrode directly in-line with the sample through a
“Tee” pipe fitting using the In-line Mounting Kit (Cat. No. 46402-00), see Figure 15 on
page 61. Pressure reducers may be required if the sample pressure is greater than 35 psig.
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1.8 Principle of Operation
The EC1000 Process pH/ORP System consists of a combination pH or ORP electrode, a
controller, and a reference electrolyte pump (see Figure 5 on page 23). The electrode
consists of a pH or ORP measuring half cell and a double junction reference half cell,
which establish a potential characteristic of the sample. This potential is converted to a
proportional current by a built in preamplifier in order to stabilize the signal for long
distance transmission to the controller. Included in the electrode is a tem perature sensor
whose signal also is stab ilized and sent to the controller to allow for temperature
compensation or temperature correction of the pH/ORP measurement. Separate from the
controller and electrode is a reference electrolyte pump that supplies fresh electrolyte to
the reference half cell. The pumped electrolyte maintains an open reference junction
through a capillary outlet to produce a stable and constant reference potential.
Note: The electrolyte
pump is not used with the
self-pressurized Industrial
Process pH Electrode with
self-pressurized
electrolyte, Cat. No.
48276-00. See Section 1 .6
Industrial Process pH
Electrode.
Figure 5 System Components
As the electrode measures the pH (or mV) of the water source, a signal is transmitted to
the controller. If the pH (or mV) is outside the setpoint range, the controller can transmit
a current output signa l to a reagen t pump (or v alv e) tha t adds reage nt to a mix ing tank. See
Figure 6 on page 24 for details. As the reagent is added to th e water, the value of the pH
(or redox potent ia l) i s adjusted to fall within t he setpoint range. Refer to SECTION 4, PID
CONTROL, for a detailed discussion of this process.
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Figure 6 pH Control Loop
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SECTION 2 OPERATION
2.1 Operating the User-Programmable Setup
The EC1000 Controller is a menu-operated instrument. In the setup menu, each of
the instrument settings are grouped into submenus of common settings. For user
programming, move to the desired setting, and edit the current value. Refer to
Table 18 on page 99, which describes operation of the Diagnostic Test Menu.
2.1.1 Moving Around the Menu
After pressing the SETUP key to enter the menu, use the UP and DOWN ARROW keys to
scroll through the top level menu to the desired entry. Use the
into a submenu (use the
desired settin g is dis played, press t he
and change the value as needed. (Exit the menu at any time by pressing the
Example—checking or changing the ALARM2, SET PoiNT:
CLEAR key to back up to the next higher menu level). Once the
ENTER key to move down
ENTER key to dis play the curr ent v alue o f the setting ,
pH/mV key.)
1. Press
2. Press
SETUP to enter the SETUP menu.
ENTER to move into the ALARMS submenu.
3. Press the
4. Press
ENTER to move into the ALARM2 submenu.
5. Press the
6. Press
ENTER to display the ALARM2 set point.
DOWN ARROW key to scroll to the ALARM2 entry.
DOWN ARROW key to scroll to the SET PoiNT entry.
2.1.2 Editing a Setup Value
Two types of setup data require editing. The first is a number entry such as an alarm set
point. Any value in the set point range can be entered. When the number entry is selected
first, the first digit space displays a flashing
ARROW key alternates between the two signs. Pressing the RIGHT ARROW key moves to
the first digit. This digit flashes indicat ing that it can be edited. Pressing the
key increas es the digit v alue, and pressing the
The remaining digits are changed by repeating this process. When the whole number is
changed to the desired value, press the
during the editing process, the original value is restored by pressing the
+ or – sign character. Pressing the UP or DOWN
UP ARROW
DOWN ARR O W ke y decrease s the digit v alue.
ENTER key to save the new value. At any time
CLEAR key.
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Example—changing ALARM2, SET PoiNT from 16.00 pH to 7.50 pH:
1. First move to the
Around the Menu. Press
2. Press the
3. Press the
4. Press the
5. Press the
6. Press the
7. Press the
RIGHT ARROW key to move the flashing digit to the right.
DOWN ARROW key to change the 1 to 0.
RIGHT ARROW key to move to the next digit.
UP ARROW key to change the 6 to 7.
RIGHT ARROW key to move to the next digit.
UP ARROW key five times to change the 0 to 5.
ALARM2 set point entry as described in Section 2.1.1 Moving
ENTER.
8. Press
ENTER to save the new value.
The second type of setup data is discrete values such as the recorder mode where a pH,
mV, or temperature recorder mode is selected. In this case, the complete entry flashes.
Pressing the
the desired entry, press the
UP or DOWN ARROW key scrolls through the list of settings. After selecting
ENTER key to save the setting.
Example—changing ALARM2, MODE from a PH HI alarm to TEMP LOW alarm:
1. Select ALARM2, MODE as described in Section 2.1.1 Moving Around the Menu.
ENTER.
Press
2. Press the
3. Press
DOWN ARROW key five times to select the TEMP LOW alarm setting.
ENTER to save the new value.
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2.1.3 Restoring Default Settings
To clear all previous settings (not necessary on first time start-up), press CLEAR and
ENTER simultaneously and the D ISPlay TeST appears:
1. Press the
DOWN ARROW key to scroll down through the display test menu to
COLD StaRT.
2. Press
ENTER. This procedure returns all settings to the controller defaults. Table 2
shows all default values for the controller setup menu.
Table 2 Setup Menu Default Value
Menu Options Submenu Default
MODE — PH HI
ALARM1
ALARM2 [same as ALARM1]
RECORDER
CONTROL
INIT SET
SET PNT — 16.00 PH
HYST — 0.10 PH
DLY TIME — 0 SEC
MODE — PH
WINDOW MINIMUM -2.00 PH
— MAXIMUM 16.00 PH
OUT TRIM 0 TRIM 1=4.00
— FS TRIM 1=20.00
MODE — PH
SET PNT — 7.00 PH
DEAD BD — 0.00 PH
PRESET — 50.0%
GAIN — 01.00
RESET — 00.00/HR
RATE — 00.00 MIN
TITR CUR CUR LINEAR+
—POINTS03
OUT TRIM 0 TRIM 1=4.00
— FS TRIM 1=20.00
°C COMP TYPE AUTO TC
— SET PNT 25.0 °C
— SOL TC 0.0 PH
SERIAL I/O BAUD 1200
— PARITY NONE
— DATA BIT 8
—STOP BIT2
— PRT DLY ENABLED
— PRT INTR 00 MINS
OUTPUT 2 — CONTROL
SIG AVG — 1 SEC
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2.2 Setup Menu
2.2.1 Alarms
Two independent programmable setpoint alarms are provided. Each alarm can be set to
operate on pH, mV, or temperature setpoints, and may b e programmab le to be either a high
alarm or a low al ar m. When the programmed setpoints are exceeded, the alarm LED turns
on. The alarm relay actuates when external power is brought to the relays. The instrument
also features programmable alarm hysteresis and delay time. Hysteresis is the difference
between the alarm turn on and turn off values. The delay time provides a delay, from the
time the alarm setpoint is excee ded, bef ore the alar m is actua ted .
The delay time is adjustable from 0 to 30 second s.
To check or program the alarm settings:
SETUP to call up the SETUP menu options.
Press
ENTER to move into the ALARMS submenu.
Press
ENTER to move into the ALARM1 submenu.
Press
The MODE menu is PH high/low, mV high/low, or temperature high/low.
ENTER to select the MODE menu.
Press
PH HI is the default. Scroll through the MODE menu by pressing the
UP ARROW key.
When the desired mode is displayed, press
ENTER to lock in the chosen MODE and move
DOWN ARROW or
to the next ALARM1 submenu.
ENTER. The current SET PoiNT value appears on the display.
Press
To change the value, move the flashing display by pressing the
and increase or decrease the value by pressing the
UP ARROW key.
When the value is set, press
ENTER. The current HYSTeresis appears on the display.
Press
ENTER.
DOWN ARROW key or the
RIGHT ARROW key
The hysteresis is adjustable from 0.01 to 2.0 pH, 0.1 to 100 mV, or 0.1 to 2.0 °C.
To change the value, move the flashing display by pressing the
increase or decrease the value by pressing the
DOWN or UP ARROW key.
RIGHT ARROW key and
ENTER.
Press
ENTER. The current DeLaY TIME will appear on the display. The ALARM1 delay
Press
time is adjustable from 0 to 30 seconds. Reset the delay time by pressing the
ARROW key and increase or decrease the value by pressing the DOWN ARROW key or
UP ARROW key.
the
RIGHT
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Press
ENTER. The DeLaY TIME is locked in, and the display returns to:
CLEAR. The display backs out to:
Press
2.2.2 Recorder Output
Press the
DOWN ARROW key.
The ALARM2 submenu is identical to ALARM1 submenu: mode; set point; hysteresis;
and delay time are all selected identical to ALARM1.
CLEAR and then CLEAR again to back out to the top level of the menu, or press
Press
pH/mV to exit the menu.
An isolated 4-20 mA recorder output is provided. The output also can be adjusted to
0-20 mA, and with the addition of a resistor across the recorder output lines, can be setup
as a 0 to 100 mV, 0 to 1 V, or 0 to 10 V voltage output. See Section 5.6.4 Recorder and
Controller for resistor installation. The recorder can be set to cover any portion of the pH,
mV, or temperature measurement range. The zero and full scale mA output can be
trimmed from the ke yboard so the out put can be calibr ated to e xact ly 4-20 mA, or adjuste d
to match the zero and full scale on the recorder being used.
To check or program the recorder settings, press the
SETUP key to call up the
SETUP menu.
Press the
DOWN ARROW key to scroll to:
This option controls the minimum and maximum outputs shown on the
RECORDER submenu:
ENTER.
Press
PH is the default. The mode options are: PH, MV, or TEMPerature. Select the mode by
pressing the
displayed, press
This option controls minimum and maximum settings on the recorder. Press
Press
Press
ARROW
Press
DOWN ARROW key or the UP ARROW key. When the desired MODE is
ENTER.
ENTER.
ENTER again to display the current MINimum value.
ENTER and change the value by pressing the RIGHT ARROW key and the DOWN
key or the UP ARROW key.
ENTER to advance to:
Press ENTER and change the cur ren t MAXimum value by pressing the RIGHT ARROW key
and the
DOWN ARROW key or the UP ARROW key.
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Press
ENTER to save the new value.
CLEAR. This backs out to the WINDOW menu of the RECORDER submenu.
Press
Next, press the
DOWN ARROW key to advance to:
The function of the OUTput TRIM adjustment is slightly different from the rest of the edit
functions. When the zero (min imum scale ) trim is se lected, th e recor der output is dri ve n to
zero (minimum scal e) , a nd the output value is displ aye d wi th the right hand digit flashing.
If the output is too lo w, pressing a nd hol ding t he
up. When the output is corre ct, re lease th e
DOWN ARROW key to adjust the setting. If a large adjustment is required (e.g., adjusting
the recorder zero from 4 mA to 0 mA), use the
digit to the left. When the
ENTER.
Press
ENTER to display and output the current recorder zero (in terms of mA output).
Press
Press the
Press
Press
Press the
Press
DOWN ARROW key or the UP ARROW key to adjust the output.
ENTER.
ENTER to display and output the current full scale recorder (in terms of mA output).
DOWN ARROW key or the UP ARROW key to adjust the output.
ENTER.
UP/DOWN ARROW keys are used, the output ramps faster.
UP ARROW ke y causes t he outp ut to ra mp
UP ARROW k ey. If the output is too hi gh, use th e
RIGHT ARROW key t o move the flashing
2.2.3 PID Output
CLEAR and then CLEAR again to back out to the top level of the menu or press the
Press
pH/mV key to exit the menu .
A second isolated 4-20 mA output is provided. This output can be selected to be either
a PID controller output or a second recorder output (see Section 2.2.5 Initial Setup, INIT
SET\OUTPUT 2). If the controller output is selected, the following menu entries are
displayed. Refer to SECTION 4 PID CONTROL for a full explanation of these settings.
To check or program the controller settings:
SETUP to call up the SETUP menu:
Press
Press the
Press
The controll er
Press
DOWN ARROW key and then the DOWN ARROW key again to scroll to:
ENTER.
MODE options are pH or mV.
ENTER. Toggle between pH or mV by pressing the DOWN ARROW key. When the
selection is made:
ENTER to save the pH or mV selection and advance to:
Press
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