Instruction Manual
alpha-pH1000
pH and ORP Controller/Transmitter
Technology Made Easy ...
68X216801 rev 1.1 07/02
Instruction Manual |
alpha-pH 1000 |
Preface
This manual serves to explain the use of the α lpha-pH1000 series pH/ORP controller/transmitter. The manual functions in two ways, firstly as a step by step guide to help the user operate the instrument. Secondly, it serves as a handy reference guide. This instruction manual is written to cover as many anticipated applications of the α lpha-pH1000 pH/ORP controller/transmitter. If you have doubts in the use of the instrument, please do not hesitate to contact the nearest Eutech Instruments’ Authorised Distributor.
The information presented in this manual is subject to change without notice as improvements are made, and does not represent a commitment on part of Eutech Instruments Pte Ltd.
Eutech Instruments cannot accept any responsibility for damage or malfunction of the unit due to improper use of the instrument.
Copyright 1997 Eutech Instruments Pte Ltd. Revised in July 2002.
All rights reserved.
Instruction Manual |
alpha-pH 1000 |
Safety Information
The Eutech Controller/ Transmitter shall be installed and operated only in the manner specified in the Instruction manual. Only skilled, trained or authorized person should carry out installation, setup and operation of the instrument.
Before powering up the unit, make sure that power source it is connected to, is as specified in the top label. Failure to do so may result in a permanent damage to the unit.
The unit has live and exposed parts inside. If it has to be opened, make sure that the power to the unit is off and disconnected.
The unit is Fuse protected. In the event the fuse has to be replaced, use only those as specified in the manual.
Instruction Manual alpha-pH 1000
TABLE OF CONTENTS
1 |
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INTRODUCTION |
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1.1 |
Description of Unit |
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1.2 |
Applications |
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ASSEMBLY AND INSTALLATION |
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2.1 |
Measurement and Control System |
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2.2 |
Unit Dimensions |
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ELECTRICAL CONNECTION |
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3.1 |
Connection Diagram |
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3.2 |
Back Panel |
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OVERVIEW |
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4.1 |
Keypad and Display |
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4.2 |
Function Groups |
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4.3 |
Control Concept |
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MEASUREMENT |
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5.1 |
Display in Measurement mode |
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5.2 |
Security Codes |
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CALIBRATION MODE |
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6.1 |
pH Calibration |
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6.2 |
ORP – mV Calibration |
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6.3 |
ORP -% Calibration |
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ADVANCED SET-UP MODE |
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7.1 |
Electrode Offset (OFS) sub-function |
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7.2 |
Setting temperature (Set oC) sub-function |
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7.3 |
Control Relay A/Control Relay B (SP1/SP2) sub-function |
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7.4 |
Controller (Cntr) sub-function |
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7.5 |
Current Output (rng) sub-function |
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7.6 |
Configuration (ConF) sub-function |
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7.7 |
Calibration (CAL) sub-function |
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AUTO/MANUAL MODE |
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8.1 |
Auto mode (mode after switch-on) |
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8.2 |
Manual mode |
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TECHNICAL SPECIFICATIONS |
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ACCESSORIES |
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GENERAL INFORMATION |
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11.1 |
Warranty |
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11.2 |
Packaging |
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11.3 |
Return of Goods |
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11.4 |
Guidelines for Returning Unit for Repair |
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APPENDICES |
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12.1 |
Appendix 1 |
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12.2 |
Appendix 2 |
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12.3 |
Appendix 3 |
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12.4 |
Appendix 4 |
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Instruction Manual |
alpha-pH 1000 |
1 INTRODUCTION
1.1Description of Unit
Thank you for purchasing Eutech’s ¼ DIN alpha-1000 series pH/ORP process controllers. This unit is used for measuring either pH or ORP parameter one at a time, and the operational mode is switchable from the menu. You can use this unit to measure pH or ORP with proportional or limit control. This controller has many user-friendly and safety features which include:
•Menu-driven program that simplifies set-up
•Built-in memory backup to ensure that calibration and other information are not erased if power supply fails
•Push-button two-point calibration and electrode offset adjustment from the keypad
•Automatic temperature compensation (ATC)
•Manual temperature compensation setting without the ATC probe, with independent setting for calibration and process temperature
•0 to 2000 second time delay adjustment on all relays – minimise false alarms
•Separately adjustable high and low set point hysteresis (dead bands) prevent chattering of relays around the set points
•Asymmetrical/symmetrical input for pH/ORP mode of operation
•Three control modes: limit, proportional pulse length or proportional pulse frequency
•Large dual display LCD for easy reading with clear multiple annunciators, alarm status, operational and error messages
•Two switching contacts as set-point triggering relays and an alarm output relay
•A third relay that can be set up to perform either Alarm or Wash function
•When set to work as Alarm relay, alerts you to set points exceeded for a set-point limits for certain time and if the Pt100/Pt1000 wires are broken or disconnected during the ATC function
•Programmable duration and frequency in the Wash mode
•Hold function freezes output current (0/4...20mA) and releases control relays
•LED indicators signal control activities to monitor controller status from a distance
•Protection against electromagnetic interference - galvanically isolated 0/4..20mA output provides safety for data logging and control purposes
•Choice of 7 buffers from USA or NIST standards
1.2Applications
Use this controller in panel mounted enclosures for applications such as water treatment and monitoring, galvanic-decontamination, chemical processing food processing, clean or waste water control and neutralisation process.
5
Instruction Manual |
alpha-pH 1000 |
2 ASSEMBLY AND INSTALLATION
2.1 Measurement and Control System
A typical measurement system consists of:
•a pH/ORP process controller
•a pH/ORP combination electrode with integrated or separate temperature sensor Pt 100/1000,
•an immersion, flow or process assembly with or without a potential matching pin (PMP)
•a final control element such as pump or valve
•a recorder and
•an appropriate pH or ORP measurement cable.
Flow Assembly |
pH Controller |
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Chart Recorder |
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alpha-pH1000 |
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MEAS |
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7.02pH |
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25.0 |
oC |
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ATC |
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ALARM |
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CAL |
REL A |
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REL B |
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REL A |
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ENTER |
AUTO |
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MANU |
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REL B |
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ESC |
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Process Assembly |
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Power Mains |
Measurement Cable |
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with Electrode |
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2.2Unit Dimensions
Flat Gasket (1mm)
(To be Inserted By Customer)
Note: The Taped Corners Have to Be On Top
92 + 0.5
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96 |
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56
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92 + 0.5
Mounting Cut-Out
max. 45
max. 175
The field-tested control panel housing is 96 x 96 mm; with protection class IP 54 (front).
6
Instruction Manual |
alpha-pH 1000 |
3 ELECTRICAL CONNECTION
3.1Connection Diagram
Caution: Ensure electrical mains is disconnected before proceeding.
pH
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18 |
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BNC |
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PE/S |
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Pt 100 Potential Matching Pin (PMP) |
Signal Input pH/ORP |
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Power Mains |
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Relay A |
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Relay B |
Alarm/Wash |
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Hold Input |
Signal Output |
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pH
mA
- +
1 |
2 |
3 |
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5 |
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10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
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PE/S |
AC: L |
N |
PE |
* ) indicated contact positions are for currentless conditions
7
Instruction Manual |
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alpha-pH 1000 |
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Temp. |
pH |
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PE |
N |
L |
S |
0 / PA |
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3 |
2 |
1 |
22 |
21 |
20 |
19 |
18 |
S |
BNC
Symmetrical high-impedance connections
Measuring Cable
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Potential |
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pH Combination |
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Matching Pin (PM) |
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Electrode |
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Asymmetrical connections
8
Instruction Manual |
alpha-pH 1000 |
3.2Back Panel
Caution: Ensure electrical mains is disconnected before proceeding.
The back panel consists of two connectors. The first connector is the 17-way PCB edge connector and the other is the 5-way connector.
Connection for the 17-way screw terminals (from left to right):
1. |
AC mains live wire |
10. |
Alarm/Wash relay working position (NO) |
2. |
AC mains neutral wire |
11. |
Alarm/Wash relay common |
3. |
AC mains protective earth wire |
12. |
Alarm/Wash relay resting position (NC) |
4. |
Low set relay resting position (NC) |
13. |
Hold function switch terminal 1 |
5. |
Low set relay common |
14. |
Hold function switch terminal 2 |
6. |
Low set relay working position (NO) |
15. |
No connection |
7. |
High set relay resting position (NC) |
16. |
0/4 - 20 mA for -ve connection |
8. |
High set relay common |
17. |
0/4 - 20 mA for +ve connection |
9. |
High set relay working position (NO) |
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Connections for the 5-way screw terminals:
18.Pt100/Pt1000 lead 1 terminal
19.Pt100/Pt1000 sense lead terminal
20.Pt100/Pt1000 lead 2 terminal
Note: If using a two-wire RTD, short terminal 19 to terminal 18.
Pt 100/Pt 1000 is selectable via an internal jumper. Factory default is Pt100. See Appendix 1 for directions on switching the RTD type.
21.pH/ORP (potential matching pin)
21. pH/ORP (shield)
Pt100/ |
0V/ |
S/ |
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Pt1000 |
PAL |
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FUSE 250VAC 100mA (F)
L N PE
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RELAY A |
RELAY B |
ALARM / WASH HOLD |
NC |
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-
+
IMPORTANT: The Alarm relay functions as an “Active Low” device i.e. it switches OFF under Alarm condition. Therefore the Alarm display device should be connected to the ‘NC’ contacts of the relay (11 and 12). In the Wash mode, the relay works on a positive mode. Therefore, the Wash device should be connected to the contacts 10 and 11.
9
Instruction Manual |
alpha-pH 1000 |
4 OVERVIEW
4.1Keypad and Display
4.1.1Keypad
CAL |
• Perform rapid 2-point calibration |
•Allows entry to Set up mode
•Select individual functions within the function group of Set up mode
•Store input data in the Set up mode
•Start calibration in the calibration mode
•Select various function groups in the Set up mode.
•Set parameters and numerical values in sub functions of Set up mode If pressed continuously, the setting speed increases
• Control the relays in the MANUAL function
• Return to the Measurement mode when both keys are pressed together
• Switch between AUTO and MANUAL relay operation using a code
•Display limit set-point values for the switch contacts in AUTO relay operation mode
•Switch between RELAY A and RELAY B in MANUAL relay operation mode
4.1.2Display
The LCD display features two numerical displays that show status messages and measured values for easy, quick reference. The display provides short-text information for setting parameters and configuration.
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MEAS: Measurement mode |
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• SETUP: Set-up mode of function groups |
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• CAL: Calibration mode of pH/ORP and temperature |
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SETUP |
MEAS CAL CON |
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READY: Comes on after a successful calibration |
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READY |
7.00 pH |
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HOLD |
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HOLD: Relay position and current output are frozen |
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ERR |
oC |
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ATC: Comes on in the ATC mode. Disappears in the |
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25.0 ATC |
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Manual temperature Compensation mode. |
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“ATC” flashes if the temperature probe is faulty in its ATC |
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mode |
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•ERR: Error or alarm indicator
•Display for RELAY A/B. Green LED indicates measured value within limit while RED LED indicates measured value outside limit.
•Alarm display if limit value overshoot or the ATC probe fails; with ERR annunciator appears on the display. Wash display if cleaning cycle is on.
10
Instruction Manual |
alpha-pH 1000 |
4.2Function Groups
The main function and sub-function groups are organised in a matrix format for configuration and selection of parameters. The main function groups are:
1)Offset adjustment (OFS)
2)Temperature Measurement / compensation settings (Set oC)
3)Control relay 1 configuration (SP1)
4)Control relay 2 configuration (SP2)
5)Control type (Cntr)
6)Current output (rng)
7)Configuration (ConF)
8)Calibration (CAL pH)
SETUP |
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SETUP |
HOLD OFS |
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HOLD |
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SEt
oC
SETUP |
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SETUP |
HOLD SP1 |
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HOLD SP2 |
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SETUP
HOLD
CAL
pH
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SETUP |
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SETUP |
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SETUP |
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HOLD ConF |
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HOLD rng |
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HOLD Cntr |
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The set-up parameters can be viewed or changed by entering a security code. See Section 5.2 for security code information.
4.2.1 How to view operating parameters without access to change them:
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SETUP |
000 |
a) Press the ENTER key. The display will prompt the user to enter a |
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HOLD |
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security code (S.Cd). Leave the security code at “000” (do not enter a |
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S.Cd |
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security code). |
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b) |
Press ENTER key again. This allows you only to view (not change) any |
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sub-functions’ settings. |
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c) |
Press the ▲ or ▼ key to scroll through the sub-functions. |
d) Press the ENTER key at a particular sub-function to view in detail. |
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e) |
Press the ENTER key to return to the sub-function menu. |
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f) |
Press the ▲ and ▼ keys simultaneously (as an Escape key) at any time to return to the Measurement |
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mode. |
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Note: To simplify operations, the controller will not display parameters that are not relevant to a particular subfunction. For example: If the user set the controller for Limit control, it will not display pulse length/frequency settings.
11
Instruction Manual |
alpha-pH 1000 |
4.3Control Concept
The main function and sub-function groups are organised in a matrix format as shown below. These functions can be accessed via the front keypad for configuration and selection of parameters.
MEASURE
CODE
OFFSET
SET oC
SET-POINT 1
SET-POINT 2
CONTROLLER
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Set Offset |
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Switch On/Off ATC |
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Process temp. |
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Calib. temp. |
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Calibrate Pt100 |
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(MTC) |
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(MTC) |
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Set value 1 |
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MIN / MAX Function |
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Hysteresis 1 |
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Pick-up delay |
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contact 1 |
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Set value 2 |
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MIN / MAX Function |
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Hysteresis 2 |
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Pick-up delay |
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contact 2 |
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Controller type |
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N.O/N.C. Contact |
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Proportional |
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Cycle time bzw. |
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range XP |
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max. frequency |
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MEASUREMENT |
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Current output |
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pH / ORP |
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pH / ORP |
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RANGE |
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0..20 / 4..20 mA |
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at 0/4 mA |
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at 20 mA |
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CONFIGURATION |
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pH / ORP Symm. |
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ALr |
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Alarm delay |
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Alarm contact |
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/ Asymmetrical |
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cont./wiper contact |
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CLn |
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1000 |
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Intv |
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Dur |
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CALIBRATION |
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Calibrate 1st value |
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Calibrate 2nd value |
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Display zero point |
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and slope |
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Dropout delay contact 1
Dropout delay contact 2
Electrode type |
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Reset to factory |
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Glass/Antimony |
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default settings |
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The controller offers two levels of password protection: (1) for direct access to calibration function and (2) for setting or editing specific controller parameters or functions in the SETUP mode to suit individual requirements.
Note: The passwords are not user-defined and have been set by factory. It is very important to keep these passwords strictly confidential to avoid unauthorised tampering of the system at all times.
Note: If the user reads parameters only, the controller automatically reverts to Measurement mode if no key is pressed for 30 seconds.
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