AMALGAMATED INSTRUMENT PM4-CO Bedienungsanleitung
Model PM4-CO
Conductivity/Resistivity/ppm
DIN Rail Mount Display/Controller
Operation and Instruction Manual
AMALGAMATED INSTRUMENT CO PTY LTD ACN: 001 589 439
NSW 2077 Australia Facsimile: +61 2 9476 2902 Internet: www.aicpl.com.au
1 Introduction
This manual contains information for the installation and operation of the PM4 Conductivity
/Resistivity/ppm Monitor. The PM4-CO is a general purpose auto ranging monitor which may be
configured to accept an input from a range of conductivity cells with cell constants ranging from
K=0.01 to K=100. Ranges and typical cell factors are shown in the table below.
Cell Range Guide
Cell K uS/cm uS/m mS/cm mS/m
factor
K=0.01 0 – 125 @ 25oC 0 – 12,500 @ 25oC 0 – 0.125 @ 25oC 0 – 12.5 @ 25oC
K=0.1 0 – 1,250 @ 25oC 0 – 125,000 @ 25oC 0 – 1.25 @ 25oC 0 – 125 @ 25oC
K=1.0 10 – 12,500 @ 25oC – 0.01 – 12.5 @ 25oC 1 – 1,250 @ 25oC
K=2.0 20 – 25,000 @ 25oC – 0.02 – 25 @ 25oC 2 – 2,500 @ 25oC
K=10.0 100 – 125,000 @ 25oC – 0.1 – 125 @ 25oC 10 – 12,500 @ 25oC
K=20.0 200 – 250,000 @ 25oC – 0.2 – 250 @ 25oC 20 – 25,000 @ 25oC
A second input is provided for a temperature sensor for automatic temperature compensation.
The PM4 can accept 100Ω RTD, 1000Ω RTD, LM335 or 100Ω thermistor or UU25J1 thermistor
type temperature sensors. The default display can be set to either resistivity, conductivity, ppm
or % by weight of Sodium Chloride. The display will toggle between temperature/conductivity or
temperature/resistivity or temperature/ppm or temperature/%NaCl indication by pressing either
the ^or vbutton. The conductivity display units can be set to show either milliSiemens per
metre, milliSiemens per centimetre, microSiemens per metre or microSiemens per centimetre. The
resistivity display is in MΩ.
Calibration, setpoint and other set up functions are easily achieved by push buttons (located
at the rear panel and/or front panel depending on model). A standard inbuilt relay provides
an alarm/control function, additional relays, retransmission and DC output voltage may also be
provided. A special “blowdown” relay operation is available for units fitted with 2 relays.
Unless otherwise specified at the time of order, your PM4 has been factory set to a standard
configuration. Like all other PM4 series instruments the configuration and calibration are easily
changed by the user. Initial changes may require dismantling the instrument to alter PCB links,
other changes are made by push button functions.
Full electrical isolation between power supply, conductivity/resistivity cell and retransmission out-
put is provided by the PM4, thereby eliminating grounding and common voltage problems. This
isolation feature makes the PM4 ideal for interfacing to computers, PLCs and other data acqui-
sition devices. The single analog output option allows the choice of temperature or main display
(conductivity or resistivity, %NaCl or PPM) output. The dual analog option allows both temper-
ature and main display to be retransmitted. Analog outputs can be set for linear or logarithmic
(up to 5 decades) output. Analog output 1 can alternatively be set for PI control operation.
The PM4 series of Panel Mount Monitors are designed for high reliability in industrial applications.
The high brightness LED display provides good visibility, even in areas with high ambient light
levels. The high contrast LCD displays provide good visibility and are ideal for battery powered
applications. LED models are available in 4 digit (20mm), 5 digit (14.2mm) with keypad, 6 digit
(14.2mm) with keypad, and 20 segment bar graph with 5 digit (7.6mm) versions. LCD models are
available in 4 digit (12.7mm) and 6 digit (12.7mm) versions.
PM4COMAN-2.2-1 3 of 48
1.1 Output options
•1, 3 or 6 extra relays (first optional relay can be set for simple on/off alarm/control or PI
control using pulse width or frequency control)
•Isolated analog retransmission (single or dual analog outputs) configurable for 4–20mA, 0–
1V or 0–10V. Analog retransmission can be set for linear operation or logarithmic operation
using 1 to 5 decades. The first analog output is configurable for retransmission or PI control
•Isolated RS485 or RS232 serial communications (ASCII)
•Isolated Digital output - binary or BCD up to 16 bit, NPN or PNP output types available
•Optional outputs are available in certain combinations e.g. Extra relay plus RS232
1.2 Conductivity measurement general information
The instrument measures conductivity by placing an AC voltage across the two conductive surfaces
(electrodes) of the conductivity cell and measuring the resulting AC current passing through the
solution. For a given cell the AC current will increase as the conductivity of the solution increases.
Any external voltage‘s present in the solution where the cell is located may cause inaccuracy and
possibly instability in the reading. Typical sources of external voltages are level sensors and badly
earthed electrical equipment such as pumps which have contact with the solution. The amount of
AC current produced by the cell depends on the conductivity of the solution, the area of the cell
electrodes and the distance between the electrodes. Any deposits which coat the cell will reduce
the surface area available and therefore cause inaccurate readings. If cells are likely to become
coated in use they will either have to be regularly cleaned or a non contact (inductive) type cell
used. The use of non contact cells is not covered in this manual.
If resistivity, ppm or percent are selected for viewing then the instrument simply measures con-
ductivity using a conventional conductivity cell and converts this reading into the required display
units. For ppm readings the conversion factor must be manually entered.
Cell K factor - The instrument can only supply a given current range through the solution
being measured therefore a cell designed for use with pure water will not be suitable for use in
measuring very high conductivity since the instrument will not be capable of providing sufficient
current for stable measurement at both extremes. This instrument requires that the resistance
of the solution be 80Ω or higher for accurate measurement. To overcome this problem cells with
different sensitivity levels are manufactured and this sensitivity level is known as the K factor. A
cell with a higher K factor will use less current in a given solution than a cell with a lower K factor.
See the table at the beginning of this chapter for typical measuring ranges for common K factor
cells. The correct K factor cell should be chosen to suit the range required for measurement.
Temperature compensation - Since conductivity changes with temperature the conductivity
value displayed is referenced to a given temperature, usually 25oC. This means that the value
being seen on the display is not necessarily the actual conductivity of the solution at that time
but is the conductivity value which would be seen if the solution temperature was 25oC. If 25oC is
not the required reference temperature i.e. if it is required to view what the conductivity reading
would be at a different temperature then the required temperature value can be set at the SOL
"C function.
This instrument allows for either manual or automatic temperature compensation. If no tempera-
ture sensor is used with the cell then the known temperature of the solution can be entered at the
dEF "C function. If a temperature sensor is used the the reading obtained from this sensor can
4 of 48 PM4COMAN-2.2-1
be used to automatically compensate for temperature changes in the solution. For process solu-
tions whose temperature varies by more than a few degrees automatic temperature compensation
is essential for accurate readings. For example water varies its conductivity at the rate of 2%/oC.
1.3 Cell Installation
When installing conductivity cells it is important to locate the cell in a position where the pipe is
always completely full. The cell electrodes must be in complete contact with the water sample. If
air is trapped around the cell electrode it will cause errors in the measurement. If oil, grease or
any insulating material is allowed to build up on the electrode surface measurement errors will also
occur.
TBPS cells are suitable for installation into non
metallic pipework. Ideally the cell should be in-
stalled from the side of the fitting. This method
is less likely to be subjected to trapped air. The
“T” fitting should be modified to allow the face
of the cell to be flush with the inside of the fitting
or pipe wall. It is acceptable for the cell to be
slightly recessed when the cell is installed from
the side of the fitting. Alternatively a 3/4” BSP
hole may be drilled/threaded into the side of a
fitting such as an existing elbow or “T” fitting.
It is acceptable to install the cell from the top
or bottom of the pipe or fitting provided care is
taken to prevent air pockets or build up of sed-
iment. In applications where the pipe diameter
is less than 50mm the reduced sample volume
around the cell electrodes may affect the accu-
racy of the reading. In these applications in-line
calibration correction is recommended. For in-
stallation into the side wall of a tank, vessel etc.
the information above applies.
PM4COMAN-2.2-1 5 of 48
TBLR, TBTH and TBTHHT cells are suitable
for installation into metallic and non metallic
pipework. The cell measurement is made on the
inside of the cell body ensuring it is virtually
unaffected by the surrounding sample or vol-
ume. The cell may be mounted in a horizontal
or vertical position and is usually installed into
a modified “T” fitting. The cell will provide a
reliable and stable reading as long as there is a
flow through the cell. Ideally the cell should be
installed into an elbow installation with the flow
entering the cell at the base opening and exit-
ing from the holes around the perimeter. This
method will provide a fast response. Alterna-
tively the cell may be installed across the flow
(not suitable for TBLR type cells or K=10.0
TBTH cells). This will provide a stable and ac-
curate measurement, but the response time will
be slower. In most applications this will not
present a problem. These cells are also suitable
for installation into sample flow lines. These are
usually installed in a flow bypass or a sample to
waste arrangement. Sample line measurement
usually provides a slower response, but has the
advantage of allowing the cell to be removed
without disturbing the process.
6 of 48 PM4COMAN-2.2-1
2 Mechanical Installation
Choose a mounting position as far away as possible from sources of electrical noise such as motors,
generators, fluorescent lights, high voltage cables/bus bars etc. An IP65 access cover which may
be installed on the panel and surrounds is available as an option to be used when mounting the
instrument in damp/dusty positions. A wall mount case is available, as an option, for situations
in which panel mounting is either not available or not appropriate. A portable carry case is also
available, as an option, for panel mount instruments.
Prepare a panel cut out of 45mm x 92mm +1 mm / – 0 mm (see diagram below). Insert the
instrument into the cut out from the front of the panel. From the rear of the instrument fit the
two mounting brackets into the recess provided (see diagram below). Whilst holding the bracket
in place, tighten the securing screws being careful not to over-tighten, as this may damage the
instrument. Hint: use the elastic band provided to hold the mounting bracket in place whilst
tightening securing screws.
92mm
45mm PANEL CUT OUT 92mm
45mm
PANEL
CUT
OUT
115mm
104mm
53mm
44mm
96mm
9mm
9.5mm
max
48mm
91mm
111mm
10mm
Mounting bracket
(2 off)
Horizontal mounting
Vertical mounting
(bar graph displays)
PM4COMAN-2.2-1 7 of 48
3 Electrical installation
3.1 Electrical installation
The PM4 Panel Meter is designed for continuous operation and no power switch is fitted to the
unit. It is recommended that an external switch and fuse be provided to allow the unit to be
removed for servicing.
The plug in, screw type, terminal blocks allow for wires of up to 2.5mm2to be fitted. Connect the
wires to the appropriate terminals as indicated below. Refer to connection details provided in this
chapter to confirm proper selection of voltage, polarity and input type before applying power to
the instrument.
When power is applied the instrument will cycle through a display sequence indicating the software
version and other status information, this indicates that the instrument is functioning. Acknowl-
edgement of correct operation may be obtained by applying an appropriate input to the instrument
and observing the reading. The use of screened cable is recommended for signal inputs.
For connection details of optional outputs refer to the separate “PM4 Panel Meter Optional Output
Addendum” booklet supplied when options are fitted.
Instrument label (example)
8 of 48 PM4COMAN-2.2-1
3.2 Electrical connection examples
If output options are fitted refer to the ”PM4 Panel Meter Optional Output Addendum” booklet
for connection details.
Conductivity/Resistivity/ppm Cells - The cell is connected to pins 10 and 11 at the rear of
the instrument. Terminal 10 is the input connection i.e. the current input from the cell. Terminal
11 is the output connection. If using a centre core type cell the centre core wire should be connected
to Terminal 10. Ensure that the PRbE CNSt function has been correctly set for probe type. AIC
cells with temperature compensation sensors are all wired with Red, Black, Blue and Yellow (or
White on older models) inner core cable. See the note below for details of TBPS cells without
temperature compensation sensors. The wiring connections are as below.
Cell wiring colour codes
Terminal AIC cells SDI cells
Cell in 10 Blue Black
Cell out 11 Yellow (or White) White
Temperature + 9 Red Red
Temperature - 7 Black Green
Shield 7 n/a Clear
PM4COMAN-2.2-1 9 of 48
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