TPS miniCHEM-Redox Manuale utente
Congratulations !
Your new miniCHEM-Redox monitor is the latest in simple, reliable process
monitoring instrumentation. With correct operation and maintenance, your
miniCHEM-Redox will give you many years of reliable service.
The miniCHEM-Redox is a breeze to operate. This manual has been designed
to help you get started, and also contains some handy application tips. If at any
stage you require assistance, please contact either your local TPS representative
or the TPS factory in Brisbane.
The manual is divided into the following sections:
1. Table of Contents
Each major section of the handbook is clearly listed. Sub-sections have also
been included to enable you to find the information you need at a glance.
2. Introduction
The introduction has a diagram and explanation of the display and controls of
the miniCHEM-Redox. It also contains a full listing of all of the items that
you should have received with the unit. Please take the time to read this
section, as it explains some of items that are mentioned in subsequent
sections.
3. Main Section
The main section of the handbook provides complete details of the
miniCHEM-Redox, including operating modes, calibration,
troubleshooting, specifications, and warranty terms.
4. Appendices
Appendices containing background information and application notes are
provided at the back of this manual.
miniCHEM
-
Redox
Process Monitor
Version : 2.01
Date : 27/09/2006
Page 2
TPS Pty Ltd
ABN 30 009 773 371
Unit 6 / 253 Leitchs Road
Brendale, QLD,
Australia, 4500
Phone : (07) 32 058 027
International : 61 7 32 058 027
Fax : (07) 3808 4871
International : 61 7 3808 4871
Web : www.tps.com.au
Page 3
Contents
1. Introduction .................................................................................................. 4
1.1 miniCHEM-Redox Illustration .............................................................................. 4
1.2 Unpacking Information ......................................................................................... 6
1.3 Specifications ........................................................................................................ 7
2. Operating Modes.......................................................................................... 8
3. Installation and Set-up ................................................................................ 9
3.1 Connection and Configuration Diagram................................................................ 9
3.2 Mounting the Enclosure ...................................................................................... 10
3.3 Mounting the Sensors .......................................................................................... 10
3.4 Terminal Connections ......................................................................................... 11
3.5 Setting the Control Limit..................................................................................... 12
3.6 Selecting Current or Voltage Output ................................................................... 14
3.7 Calibrating the 4 to 20mA Output ....................................................................... 15
3.8 CMRR Control .................................................................................................... 16
3.9 Factory Config. Jumpers ..................................................................................... 16
4. Calibration .................................................................................................. 17
4.1 Calibration Procedure.......................................................................................... 17
5. Process Monitoring ................................................................................... 18
6. Automatic Dosing ...................................................................................... 18
7. Manual Dosing ........................................................................................... 18
8. Fuse Replacement ..................................................................................... 18
9. Troubleshooting......................................................................................... 19
9.1 Instrument Function Troubleshooting ................................................................. 19
9.2 Redox Troubleshooting ....................................................................................... 20
10. Warranty.................................................................................................. 21
11. Appendices............................................................................................. 23
11.1 Terminal connections when 12V DC option is fitted...................................... 23
11.2 Relay Output Wiring Examples for mains powered units............................... 24
11.3 Relay Output Wiring Examples for 12V DC powered units ........................... 25
11.4 Drilling Template............................................................................................ 26
Page 4
1. Introduction
1.1 miniCHEM-Redox Illustration
Page 5
1
Alarm LED
The Alarm LED provides visual indication of when the control limit has been
exceeded. The control limit can be set for a “too high” or a “too low” alarm.
See section 3.5.
2
Limit Control
Adjust this control to the Redox value at which the Alarm LED and
(optional) relay output are activated. See section 3.5.
3
Zero Calibrate Control
Adjust this control to calibrate the miniCHEM-Redox in Redox standard,
such as ZoBell. See section 4.1.
4
Span Calibrate Control
This control is not required for the miniCHEM-Redox.
5
Function Switch
The Function Switch is used to select the mode of operation. See section 2.
6
Display Window
The miniCHEM-Redox has a large, easy to read LCD display. The units of
measurement are clearly shown in the window beneath the display.
7
Terminal Cover
The terminal cover provides easy access to all of the connections, (optional)
relay output fuse, configuration jumpers and user-adjustable trimmers. The
cover is water resistant to IP65.
Page 6
1.2 Unpacking Information
Before using your new miniCHEM-Redox, please check that the following
accessories have been included:
Part No
1. miniCHEM-Redox Process Monitor...................... 111142
2. ZoBell Redox Standard............................................ 121309
(200mL each of Part A and Part B)
3. miniCHEM-Redox Handbook ............................... 130050
Options that may have been ordered with your miniCHEM-Redox:
Dip mounted Redox sensor, and submersible assembly…
1. Submersible, Non-flow Redox Sensor, 5m .............111260
2. Intermediate Junction Redox Sensor, 5m ................ 121267
3. Submersible protective housing for Redox sensor... 111303
Screw-in Redox sensor, and adaptor for 40mm PVC pipe…
1. Screw-in, Non-flow Redox Sensor, 5m................... 111262
2. ¼” BSP thread adaptor for 40mm PVC pipe ........... 111305
Instrument options…
1. Relay control output ................................................ 130342
2. 4-20mA loop-powered, remote LCD....................... 130080
Page 7
1.3 Specifications
Range............................................................................................... 0 to +1000 mV
or 0 to -1000 mV (factory option)
Resolution....................................................................................................... 1 mV
Accuracy....................................................................................................... ±1 mV
Linearity........................................................................................................ ±1 mV
Repeatability................................................................................................. ±1 mV
Ambient Drift ................................................................................ <0.02% span/
o
C
Long term drift.................................................................................<0.1% per year
Zero Range ............................................................................................... ±100 mV
Span Range............................................................................................80 to 110%
Input Impedance ................................................................................... >3 x 10
12
Ω
Common Mode Rejection.............................................................................120 dB
Enclosure .......................................................... Polycarbonate, waterproof to IP65
Display............................................ 12.7 mm LCD (optional remote 4-20mA loop
powered display available)
Analogue Outputs............................ 4 to 20mA (500 Ohms max. loop resistance )
0 to 1 V DC (min. load 1000 Ω)
0 to 10 V DC optional (min. load 1000 Ω)
Control Output (optional) ..................................... Clean contact changeover relay,
rated to 2A at 240V AC
Isolation ..............................................................Galvanic isolation of sensor input
Power....................................................... 240V AC, 50/60Hz (120V AC optional)
Dimensions ............................................................................... 172 x 160 x 71 mm
Mass...................................................................... Instrument only: Approx 800g
Full Kit : Approx 1.5kg
Operating Environment: ....................................... Temperature : 0 to 45
o
C
Humidity :0 to 95 % R.H.
Page 8
2. Operating Modes
The function switch is used to select the required mode. The four operating modes
available are…
1. SET LIMIT : Switch to SET LIMIT when setting the Redox value at which
the Alarm LED and (optional) relay output are activated. The
relay output is not operational in this mode. See section 3.5.
2. STANDBY : Switch to STANDBY to inhibit the Alarm LED and (optional)
output relay action. Select this mode for calibration, or when
automatic dosing is not required.
3. AUTO : Switch to AUTO to enable the Alarm LED and (optional)
relay output. These will be activated when the Redox is
outside the limit value. See section 3.5.
4. MANUAL : Switch to MANUAL to manually dose chemicals when the
optional relay output is fitted. The relay output will be
activated for as long as the miniCHEM-Redox is in this
mode, regardless of the Redox reading. See section 7.
Page 9
3. Installation and Set-up
3.1 Connection and Configuration Diagram
The diagram below is provided as a reference for the terminal connections,
configuration jumpers and user-adjustable trimmers that are discussed throughout
this section.
Page 10
3.2 Mounting the Enclosure
The miniCHEM-Redox can be wall-mounted with 3 screws. Two mounting
points are located underneath the terminal cover, and are positioned so that they
do not affect the waterproofing of the enclosure. The third mounting point is
centrally located near the top of the rear of the enclosure, and has been designed
to hook over a screw-head. The dimensions for the mounting screw centres are
provided on the rear of the enclosure. The last page of this manual may be
photocopied or removed for use as a drilling template.
3.3 Mounting the Sensors
Mounting the sensors is a very important aspect of the installation, and is often
done incorrectly. In automatic control situations, the sensors should always be
mounted as close as possible to the injection point. This will cause the sensors to
detect the added chemicals immediately, and shut the addition off until mixing
has taken place. For in-line mounting, it is important that chemicals are injected
upstream. Additionally, the line must be run through a mixing chamber, such as a
large drum, to ensure that the injected chemical has mixed in properly by the time
the solution flows past the sensors. There must always be adequate flow of fresh
sample past the sensor, for accurate monitoring. The diagrams below show typical
mounting arrangements for “dip” mounting and in-line mounting.
Dip Mounting In-line Mounting
1. Injection point close to sensor. 1. Injection point upstream from
2. Submersible housing to protect and close to sensor.
sensors and waterproof rear of 2. Mixing container after injection
cable (part no 111303). and before sensor.
3. Continuous stirring. 3. Redox sensor mounted as close to
vertical as practical.
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