AMALGAMATED INSTRUMENT PM4-RT8 Guide

PM4-RT8
Multi Input RTD
Process Monitor/Controller
Operation and Instruction Manual

Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Basic setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PM4-RT8 inputs & outputs . . . . . . . . . . . . . . . . . . . . . . . 3
Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4
Input/Output Configuration . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RTD connection examples . . . . . . . . . . . . . . . . . . . . . . . 7
Power supply connections . . . . . . . . . . . . . . . . . . . . . . . 7
Relay connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Remote input connections . . . . . . . . . . . . . . . . . . . . . . . 7
Explanation of Functions . . . . . . . . . . . . . . . . . . . . . . . . 8
Easy alarm relay adjustment access facility . . . . . . . . . . . . . . 9
Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Function Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . 26
Output Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Physical Characteristics. . . . . . . . . . . . . . . . . . . . . . . . 26
Guarantee and Service . . . . . . . . . . . . . . . . . . . . . . . . . 27
RT08 25F13 Page 2 of 27 PM4RT8MAN-1.4-0

1 Introduction
Thismanual contains information for the installation and operation of the PM4-RT8 Monitor. The
PM4can acceptuptofour4wireRTDsoreight2 wireRTDs.One inputtype canbeselectedforall inputsthe
choice ofinputtype is Pt100or Pt1000 RTD.Resolutioncanbeselectedas1
o
or 0.1
o
.Thedisplaycanbeset
to automatically scrollthrougheachinput or the ^orvbuttoncan be used to manuallyscrollthrougheach
input display.
The instrument may be calibrated to display in
o
C,
o
F or
o
K. A standard inbuilt relay provides an
alarm/controlfunction.Optional extra relaysanalogorbinary/BCD retransmission orserialcommunications
may also be provided. Relays can be set for latching or nonlatching operation.
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 calibrationis easily changed by
the user. Full electrical isolation between power supply, input and retransmission output (optional) 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 acquisitiondevices.
Theversatile PM4 has various front panel layout options, in some cases the pushbuttons may be
locatedonthe frontpanel as wellasthestandard rearpanelconfiguration. The PM4-RT8is availablein 5, 6
or 5 digit plus bargraph LED display form.
ThePM4 series of Panel Mount Monitors are designedfor high reliability in industrial applications.
The high brightness LED display provides good visibility, even in areas with high ambient light levels.
1 .1 Basic setup
The steps below allow a basic setup for temperature display. Refer to the "Explanation of
Functions"chapterforadescriptionofthefunctionsmentionedbelowandforadescriptionofotherfunctions
which may be required. The basic setup requirements to obtain temperature displays for each input are:
1. Connect the inputs as shown in "Electrical Installation" chapter
2. Enter CAL mode as shown at the beginning of the "Explanation of Functions" chapter
3. Step through to the INPt tYPE function and select the input type
4. Step through to the rtd tYPE function and select the RTD type required
5. Step through to the INPt chnI function and select the number of inputs required
6. Step through to the SEt dISP function and select the display type required
7. Step through to the dEG tYPE functionand select the units for display then press Fto accept this
last change.
8. Press Pto exit the function setup display and return to the measurement display.
1 .2 Calibration
A single point calibration is available for each channel.If the sensor type is changed each channel
will have tobe recalibrated. The calibration functions for each channel are namedch1 CAL for channel 1
calibration, ch2 CAL for channel 2 calibration. See "Explanation of Functions" chapter for details.
1 .3 PM4-RT8 inputs & outputs
Page 3 of 27 PM4RT8MAN-1.4-0
P F
Process units
Setup pushbuttons
Temperature
Channel number can be selected for display on
either left or right of temperature or you can
choose not to display the channel number.
With some setups a letter can be seen:
- highest, - lowest, - average or - differenceH L A d
Inputs:
Up to 4 x 3 wire Pt100
or
Up to 4 x 3 wire Pt1000
or
Up to 8 x 2 wire Pt100
or
Up to 8 x 2 wire Pt1000
Output:
Optional outputs:
1 x setpoint relay
Up to three extra setpoint relays.
Analog output (single or dual)
Serial comms(RS232 or RS485)
BCD/binary retransmission

2 Mechanical Installation
If a choice ofmountingsites is availablethenchoose asiteas far away as possible fromsources of
electrical noise such as motors, generators, fluorescent lights, high voltage cables/bus bars etc. An IP65
access cover which maybe installed on the panel and surrounds is available as an option to be used when
mounting the instrumentin damp/dusty positions.A wallmount caseis available,as an option, for situations
in which panelmountingis either not available or notappropriate.A portable carry case isalso available, as
an option, for panel mount instruments.
Prepareapanelcutoutof45mmx92mm+1mm/-0mm(seediagrambelow).Inserttheinstrument
intothecutoutfromthefront ofthepanel.Then, from therearof theinstrument,fitthe twomountingbrackets
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:usetheelasticbandprovidedtoholdthemountingbracketinplacewhilsttighteningsecuringscrews.
Page 4 of 27 PM4RT8MAN-1.4-0
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)

3 Input/Output Configuration
Page 5 of 27 PM4RT8MAN-1.4-0
Remove earth screw
which passes through the
case then slide out
the printed circuitboard
If you need to alter theinput or output configuration proceed as follows:
1. Remove the plug in terminals
from the rear of the instrument
2. Remove 4 x self tapping screws from
back cover, remove back cover by pulling
it away from the instrument
3. Using a screwdriver, remove
the earth screw which passes
through the case then slide out
the board or boards
4. Configure the PCBlinks as required, see appropriate chapter
5. Slide PCB back into the case
6. Replace the earth screw which passes through the case
7. Refit back cover and fix with the self tapping screws
8. Plug the terminal strips back into the rear of the instrument

4 Electrical Installation
ThePM4 Panel Meteris designed for continuousoperation and nopowerswitch isfitted to the unit.
Itisrecommendedthatanexternalswitchandfusebeprovidedtoallowtheunittoberemovedforservicing.
The plug in, screw type, terminal blocks allow for wires of up to 2.5mm
2
to be fitted. Connect the
wires to the appropriate terminalsasindicated below. Refer to connection details provided in this chapter to
confirm proper selectionof voltage, polarity and input type before applying power to the instrument. When
power isapplied to the instrument will cycle through a display sequence indicating the software version and
other status information, this indicates that the instrument is functioning. Acknowledgement 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 wiring details for optional outputs refer to the separate “PM4 Panel Meter Optional Output
Addendum” booklet supplied when options are fitted.
Page 6 of 27 PM4RT8MAN-1.4-0
1 2 3 4 5 6
MAINS EARTH
AC ACTIVE
AC NEUTRAL COM
REMOTE
INPUT
RELAY 1
RTD1
RTD5
RTD2
RTD6
RTD3
RTD7
RTD4
RTD8
GND
GND
N/O
(DC+)
(DC-)
A
B HC D E F J K
7138 149 1510 16
11 1712 18
Instrument rear panel - 2 wire connection
1 2 3 4 5 6
MAINS EARTH
AC ACTIVE
AC NEUTRAL COM
RELAY 1
RTD1
RTD3
RTD1 3W
RTD3 3W
RTD2
RTD4
RTD2 3W
RTD4 3W
GND
GND
N/O
(DC+)
(DC-)
A B HC D E F J K
7138 149 1510 1611 1712 18
REMOTE
INPUT
Instrument rear panel - 3 wire connection

4 .1 RTD connection examples
4 .2 Power supply connections
The power supply for the instrument is factoryfitted and is of a fixed type. If you are unsure of the
supplyrequirementforyourinstrumentitcanbedeterminedbythemodelnumberontheinstrumentlabel:-
PM4-RT8-240-...... Requires 240VAC
PM4-RT8-110-...... Requires 110VAC
PM4-RT8-24-...... Requires 24VAC
PM4-RT8-DC-..... Requires between 12 and 48VDC
PM4-RT8-DCH-..... Requires between 50 and 110VDC
4 .3 Relay connections
The PM4is suppliedwith onealarm relayasstandard with connections on terminals 5 and 6. Extra
relays are optionally available. The relay is a single pole, single throw type (form A) and is rated at 5A,
240VAC into aresistiveload.Therelaycontact is voltage freeand may beprogrammedfornormallyopen or
normally closed operation.
4 .4 Remote input connections
Terminals 7 & 8 are the remote input terminals. The operation selected by the R.INP function is
activated when terminals 7 & 8 are shorted via switch, relay etc.
Page 7 of 27 PM4RT8MAN-1.4-0
RTD1
RTD2
RTD3
RTD4
GND
7 13
8149 1510 16
11 1712 18
Example - 4 x 2 wire RTD
RTD1
RTD2
RTD3
GND
GND
GND
3W
3W
3W
RTD
RTD
RTD
7 138 14
915 10 1611 1712 18
Example - 3 x 3 wire RTD

5 Explanation of Functions
The PM4 setup and calibration functions are configured through a push button sequence. Two
levelsofaccessareprovidedforsettingupandcalibrating:-
FUNC mode (simple push buttonsequence) allows
access to commonly set up functions such as alarm
setpoints. CAL mode (power up sequence plus push button
sequence) allowsaccesstoall functionsincludingcalibration
parameters.
The three push buttons located at the rear of the
instrument (also at the front on some display options) are
used to alter settings. Once CAL or FUNC mode has been
entered you can step through the functions, by pressing and
releasing the Fpush button, until the required function is
reached. Changes to functions are made by pressing the ^
or vpush button (in some cases bothsimultaneously) when
the required function is reached. See the flow chart example
on the following page.
Note: the ACCS or R.INP function can be used to block access to FUNC mode.
Page 8 of 27 PM4RT8MAN-1.4-0
Process Units
Front view of instrument
SETUP
PUSHBUTTONS
SETUP
PUSH BUTTONS
Rear view of instrument
1 2 3 4 5 6 7 8 9 10 11
SETUP
PUSHBUTTONS
F
F
^
^
v
v
Entering Mode
CAL
Entering Mode
FUNC
Alternative Mode EntryCAL
1. Remove power from
the instrument. Hold in the
button and reapply power.
The display will briefly indicate
as part of the
"wake up messages" when
the message is seen
you can release the
button.Move to step 2 below.
2.When the "wake up"
messages have finished
and the display has settled
down to its normal reading
press, then release the
button.
Move to step 3 below.
1.When the "wake up"
messages have finished
and the display has settled
down to its normalreading
press, then release the
button.
3.Within 2 seconds of
releasing the button
press, then release
the and buttons
together. The display will
now indicate followed
by the firstfunction.
2. Within 2 seconds of
releasing the button
press, then release
the and buttons
together.The display will
now indicate followed
by the first function.
This alternative method allows mode
entry without the need to remove power:
Enter mode using the 2 stepsabove
When the first function appears press and
hold the button until you see the message
followed by (the button will have
to be held pressed for approximately 2 seconds)
You should now return to the function you were
in but have full access to mode functions
Note:when you exit back to live reading the PM4
will remain in mode for approximately 4
minutes, after this time you will need to repeat
this process to enter mode.
CAL
FUNC
FUNC CAL
CAL
CAL
CAL
1.
2.
3.
P
P
^
^
^
^
FUNC
FUNC
F
F
F
F
F
CAL
CAL
Note:If step 1 above has been completed then the
instrument will remain in this mode state until
power is removed.i.e. there is no need to repeatstep 1
when accessing function unless power has been removed.
CAL
Nospecial power up procedure
is required to enter mode.FUNC

The alarm and brightness functions below are accessible via FUNC mode.
Note that “x” in the alarm functions is used to indicate any alarm number e.g. if 3 setpointalarm relays are
fitted then A1Lo, A2Lo and A3Lo will all seen as functions on the display.
5 .1 Easy alarm relay adjustment access facility
The PM4-RT8has aneasy alarmaccess facility whichallows access to the alarmsetpoints simply
bypressingtheFbuttonatthefrontorrearoftheinstrument.Thefirstsetpointwillthenappearandchanges
to this setpoint may be made to this setpoint via the ^or vbuttons. Press the Fbutton to accept any
changes orto move on tothenext setpoint. Note: this easyaccessalso functionsinthesamemanner for the
PIcontrol setpoint(relayand/oranalogPIoutput).Forfurtherdetails ofanalog PI easy setpointaccessrefer
totheseparate“PM4PanelMeterOptionalOutputAddendum”bookletsuppliedwhenthisoptionisfitted.
The instrument must be set in the manner described below to allow the easy access facility to work:
1. The R.INP function must be set to SP.AC or the ACCS functionmust be set to EASY.
2. Atleastonealarmmusthaveasetpoint,nothingwillhappenifallthealarmsetpointsaresettoOFF.
3. The SP.AC function must be set to allow access to the relays required e.g. if set toA1-2 then the
easy access will work only with alarm relays 1 and 2 even if more relays are fitted.
4. The instrument must be in normal measure mode i.e. if the instrument is powered up so that it is in
CAL mode then the easy access will not function. If in doubt then remove power from the instrument,
wait for a few seconds then apply power again.
5. If theeasy access facility is used then the only way to view or alter any other function settings is to
powerupviaCAL modei.e.thereisnoentrytoFUNC modeunlesstheinstrumentispoweredupin CAL
mode.
Page 9 of 27 PM4RT8MAN-1.4-0
F U N C
F U N C
F U N C
F U N C
E n d
E n d
A 1 H i
d C P t
CAL
OFF
0
100
.0 1
Press& release
Press & release
Press& release
Press& release
Press & release
Press & release
Press & release
Press &release
Press & hold Release
Press & release F
Press & release F
^until
^until
F
F
P For until
P For until
Funtil
Funtil
FF
Hold untilF
then press
^v
then press ^v
Switch off
instrument Switch on
instrument
Example: Entering mode to change alarm 1 high function from to
FUNC A1Hi OFF 100
Example: Entering mode to change decimal point function from toCAL dCPt 0 0.1

Function Range Description
AxLo Value Alarm low setpoint - displays and sets the low setpoint value for the designated
alarm relay. The low alarmsetpoint may be disabled by pressing the ^and v
pushbuttons simultaneously. When the alarm is disabled the display will
indicate OFF . Use ^or vto adjust the setpoint value if required. The alarm
will activate when the displayed value is lower than the setpoint value. Each
relay may be configured with both a low and high setpoint if required, if so the
relay will be activated when the display reading moves outside the band set
between low and high setpoints.
AxHi Value Alarm high setpoint - displays and sets the high setpoint value for the
designated alarm relay. The high alarm setpoint may be disabled by pressing
the ^and vpushbuttons simultaneously. When the alarm isdisabled the
display will indicate OFF. Use ^or vto adjust the setpoint value if required.
The alarm will activate when the displayed value is higher than the setpoint
value. Each relay may be configured with both a low and high setpoint if
required, if so the relay will be activated when the display reading moves
outside the band set between low and high setpoints.
AxHY 0 to
9999
units
Alarm hysteresis [deadband] - displays and sets the alarm hysteresis limit and
is common for both high and low setpoint values. The hysteresis value may be
used to prevent too frequent operation of the setpoint relay when the
measured value stays close to the setpoint. Without a hysteresis setting (AxHY
set to zero) the alarm will activate when the display value goes above the
alarm setpoint (for high alarm) and will reset when the display value falls below
the setpoint, this can result in repeated on/off switching of the relay at around
the setpoint value. The hysteresis setting operates as follows:
In the high alarm mode, once the alarm is activatedthe input must fall below
the setpoint value minus the hysteresis value to reset the alarm. e.g. if A1Hi
is to 50.0 andA1Hy is set to 3.0 then the setpoint output relay will activate
once the display value goes above 50.0 and will reset when the display value
goes below 47.0 (50.0 minus 3.0).
In the low alarm mode, once the alarm is activated the input must rise above
the setpoint value plus the hysteresis value to resetthe alarm. e.g. if A1Lo is
to 20.0 and A1Hy is set to 10.0 then the alarm output relay will activate
when the display value falls below 20.0 and will reset when the display value
goes above 30.0 (20.0 plus 10.0).
The hysteresis units are expressed in displayed engineering units.
Axtt 0 to
999.9
seconds
Alarm trip time - displays and sets the alarm trip time and is common for both
alarm high and low setpoint values. The trip time is the delay time before the
alarm relay will activate, or trip, when an alarm condition is present. The alarm
condition must be present continuously for the trip time period before the alarm
will trip. This function is useful for preventing an alarm trip due to short non
critical deviations from setpoint. The trip time is selectable over 0to 999.9
seconds.
Axrt 0 to
999.9
seconds
Alarm reset time - displays and sets the alarm relay reset time. With the alarm
condition is removed the alarm relay will stay in its alarm condition for the time
selected as the reset time. The reset time is selectable over 0to 999.9
seconds.
Axn.o or
Axn.c
Axn.o or
Axn.c Alarm x normally open or normally closed - displays and sets the setpoint alarm relay action to normally open (de-energised) or normally closed
(energised), when no alarm condition is present. A normally closed alarm is
often used to provide a power failure alarm indication.
Page 10 of 27 PM4RT8MAN-1.4-0