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

Function Range Description
Ax.SP,
Ax.t1,
Ax.t2
etc.
Ax.SP,
Ax.t1,
Ax.t2
etc.
Relay operation independent setpoint or trailing setpoint - each alarm may be
programmed to operate with an independent setpoint setting or may be linked
(ortrailing) to operate at a fixed difference to another relay setpoint. The
operation is as follows:
Alarm 1 (AI) is always independent. Alarm 2 (A2) may be independent or may
be linked to Alarm 1. Alarm 3 (A3) may be independent or may be linked to
Alarm 1 or Alarm 2. Alarm 4 (A4) may be independent or may be linked to
Alarm 1, Alarm 2 or Alarm 3. The operation of each alarm is selectable within
the Function Setup Mode by selecting, for example, (Alarm 4) A4.SP = Alarm
4 normal setpoint or A4.t1 = Alarm 4 trailing Alarm 1 or A4.t2 = Alarm 4
trailing Alarm 2 or A4.t3 = Alarm 4 trailing Alarm 3. For trailing set points the
setpoint value is entered as the difference from the setpoint being trailed. If the
trailing setpoint is to operate ahead of the prime setpoint then the value is
entered as a positive number and if operating behind the prime setpoint then
the value is entered as a negative number. For example, with Alarm 2 set to
trail alarm 1, if A1Hi is set to 100 and A2Hi is set to 50 then Alarm 1 will
activate at 100 and alarm 2will activate at 150 (i.e. 100 + 50). If Alarm 2 had
been set at -50 then alarm 2 would activate at 50 (i.e. 100 - 50). See the
trailing alarm table which follows.
Ax Ltch on or
OFF Relay latching on or off. When set to OFF the relay will reset automatically when the display shows the input is not in alarm condition. If a 5 digit display
with alarm annunciators is used the annunciator will light solidly when the input
is in alarm condition and will be extinguished when the relay resets.
If set to on the relay will latch when it is activated by an alarm condition and
can only be manually reset or acknowledged via the Pbutton or remote input
(see P.but and R.INP functions). If the alarm condition is acknowledged
whilst still in alarm condition the relay will automatically deactivate when it
moves out of alarm condition. If a 5 digit display with alarm annunciators is
used the annunciators will operate in the following manner:
1. Input goes to alarm condition - annunciator flashes on 80%, off 20%, relay is
activated.
2. Input goes out of alarm condition but has not been reset - annunciator
flashes on 20% , off 80%, relay activated.
3. Input in alarm condition when manually acknowledged - annunciator lit
solidly, relay is activated.
4. Input out of alarm condition and reset or acknowledged - annunciator light
extinguished, relay is de-activated.
See also the A1 OPER, A2 OPER etc. functions.
brgt 1 to 15 Display brightness - displays and sets the digital display brightness. The
display brightness is selectable from 1 to 15, where1 = lowest intensity and
15 = highest intensity. This function is useful for improving the display
readability in dark areas or to reduce the power consumption of the instrument.
Page 11 of 27 PM4RT8MAN-1.4-0
Trailing Alarm Table
Showing Possible Alarm Assignments
A2 A3 A4
A1 A2.t1 A3.t1 a4.t1
A2 A3.t2 A4.t2
A3 a4.t3

Function Range Description
duLL 0 to 15 Remote display brightness - Displays and sets the level for remote input
brightness switching, see R.INP function. When the remote input is set to
duLL the remote input can be used to switch between the display brightness
level set by the brGt function and the display brightness set bythe duLL
function. The display brightness is selectable from 0to 15, where 0= lowest
intensity and 15 = highest intensity. This function is useful in reducing glare
when the display needs to be viewed in both light and dark ambient light
levels.
The functions which follow are accessible via CAL mode only or if ACCS function is set to ALL
bAr_ Value Bar graph display low value - seen only in bargraphdisplay instruments.
Displays and sets the graph low value i.e. The
value on the 7 segment display at which the
bargraph will start to rise. This may be
independently set anywhere within the display
range of the instrument.
Note: The bAr~ and bAr_ settings are
referenced from the 7 segment display
readings, not the bargraph scale values.
The bargraph scale may scaled differently to
the 7 segment display, as shown on the right
where bargraph scale is 0 to 100 yet the
display is showing 675.3. In this example
the bargraph scale may be indicating
percentage fill of a tank whilst the 7 segment
display is indicating actual process units.
The bargraph is available as a 20 segment
straight bar or 16 segment circular bargraph
See the bAr tYPE function which follows for
bargraph operation modes.
bAr~ Value Bargraph display high value - seen only in bargraph display instruments.
Displays and sets the bar graph high value i.e. the value on the 7 segment
display at which the bargraph will reach its maximum indication (all LED’s
illuminated). May be independently set anywhere within the display range of
the instrument.
Page 12 of 27 PM4RT8MAN-1.4-0
F
1
2
3
4
P
100
75
50
25
0
6 7 % 3
%
7 Segment
Display
Bargraph
Scale
bAr~
b Ar_
123 4
F
P
bA r~
bA r_
Bargraph starts
at this segment
Bargraph ends
at this segment
16 segment
circular bar
graph

Function Range Description
bAr
tYPE
bAr
S.dot
d.dot
or
C.bAr
Bar graph display operation mode - seen only in bargraph display instruments.
Allows selection of bargraph operation mode choices are:
bAr -conventionalsolidbargraphdisplayi.e.allLED’silluminatedwhenatfull
scale. e.g. when scaling the display use the bAr_ and bAr~ functions e.g.
bAr_ =0 and bAr~ =100 will give a bargraph with no segments lit at a 7
segment display reading of 0and all segments lit with a 7 segment display
reading of 100.
S.dot - single dot display. A single segment will be lit to indicate the input
readings position on the scale. e.g. when scaling the display use the bAr_
and bAr~ functions e.g.bAr_=0 and bAr~ =100 will give abargraph with
the bottom segment lit at a 7 segment display reading of 0and the top
segment lit with a 7 segment display reading of 100.
Note: thiscouldalso be setup asa centrezerosingledot display byentering a
negative value and positive value. e.g. bAr_ =-100, bAr~ =100.
d.dot - double dot display. Two segments will be lit to indicate the input
reading position on the scale. The reading should be taken from the middle of
the two segments. e.g. when scaling the display use the bAr_ and bAr~
functions e.g.bAr_=0 and bAr~ =100 will givea bargraph with thebottom
twosegmentslitata 7segment display readingof0andthe toptwo segments
lit with a 7 segment display reading of 100.
Note: thiscouldalso be setup asa centrezerosingledot display byentering a
negative value and positive value. e.g. bAr_ =-100, bAr~ =100.
C.bAr -centrebardisplay.Thedisplaywill beasolid bargraphbutwillhaveits
zero point in the middle of the display. If the seven segment display value is
positive the bargraphwill rise. Ifthe seven segment display value is negative
then the bargraph will fall. e.g. when scaling the display use the bAr_ and
bAr~ functions e.g. bAr_ =0 and bAr~ =100 will give a bargraph with all
the bottom half segments lit at a 7 segment display reading of -100 and all
the top segments lit with a 7 segment display reading of 100.
dG.OP bin2,
bin,
b.SCL
or
bcd
Digital output mode - seen only with digital output option. Refer tothe separate
“PM4 Panel Meter Optional Output Addendum” booklet supplied when this
option is fitted.
Selections available are: bin2 (signed binary), bin (unsigned binary),
b.SCL (scaled binary), bcd (binary coded decimal).
dG.OP AIo or
AHi
Digital output polarity - seen only withdigital output option. Refer to the
separate “PM4 Panel Meter Optional Output Addendum” booklet supplied
when this option is fitted.
Select either A Io - active low output or A Hi - active high output.
bcd
Strt
0to
number
of
display
digits
minus 4
BCD - start display position - seen only with digital output option. Refer to the
separate “PM4 Panel Meter Optional Output Addendum” booklet supplied
when this option is fitted.
This function affects BCD mode only and determines the number of digits to
skip when outputting from the display. Select from 0 to number of display digits
minus 4. e.g. for a 6 digit display you may select 0 to 2, if 2 is selected then the
four left most digits will be output.
dig_ Value Scaled digital output low reading - seen only with digital output option. Refer to
the separate “PM4 Panel Meter Optional Output Addendum” booklet supplied
when this option is fitted.
Accepts any valid display value. Determines the low scaling point for the
b.SCL mode and has no effect on other modes. See example which follows.
Page 13 of 27 PM4RT8MAN-1.4-0

Function Range Description
dig~ Value Scaled digital output high reading - seen only with digital output option. Refer
to the separate “PM4 Panel Meter Optional Output Addendum” booklet
supplied when this option is fitted.
Accepts any valid display value. Determines the high scaling point for the
b.SCL mode and has no effect on other modes. For example if diG_ is set to
0and diG~ is set to 65535 (2
16
) then the retransmission will not be scaled
i.e. a display of 2will cause a retransmission of 2. If diG~ is now changed to
32767 (2
15
) then a display of 2will cause a retransmission of 4.
rEC_ Value Recorder/retransmission output low value - seen only when analog
retransmission option fitted. Refer to the separate “PM4 Panel Meter Optional
Output Addendum” bookletsupplied when this option is fitted.
Displays and sets the analog retransmission (4-20mA, 0-1V or 0-10V, link
selectable) output low value (4mA or 0V) in displayed engineering units. e.g.if
it is required to retransmit 4mA when the display indicates 0then select 0in
this function via the ^or vbutton. See also REC function (analog output
mode).
rEC~ Value Recorder/retransmission output high value - seen only when analog
retransmission option fitted. Refer to the separate “PM4 Panel Meter Optional
Output Addendum” bookletsupplied when this option is fitted.
Displays and sets the analog retransmission (4-20mA, 0-1V or 0-10V, link
selectable) output high value (20mA, 1V or 10V) in displayed engineering
units. e.g. if it is required to retransmit 20mA when the display indicates 500
then select 500 in this function via the ^or vbutton. See also REC function
(analog output mode).
rEC_
Ch 2 Value Second analog recorder/retransmission output low value - seen only when the dual analog retransmission option is fitted. See REC_ function for description
of operation. See also REC2 function (analog output 2 mode).
rEC~
Ch 2 Value Second analog recorder/retransmission output high value - seen only when the dual analog retransmission option is fitted. See REC~ function for description
of operation. See also REC2 function (analog output 2 mode).
dCPt 0, or
0.1 Decimal point selection - displays and sets the display resolution. By pressing the ^or vpushbuttons the decimal point position may be set. The display
will indicate as follows: 0(1
o
resolution) or 0.1 (0.1
o
resolution)
FLtr 0 to 8Digital filter - displays and sets the digital filter value. Digital filtering is used for
reducing susceptibility to short term interference. The digital filter range is
selectable from 0 to 8, where 0 = none and 8 = most filtering. A typical value
for the digital filter would be 3. Use ^or vto alter if required. Note that at
higher filter values the display update time will increase.
INPt
tYPE
Rt2L,
Rt2H,
Rt3L or
Rt3H
Selects input type from:
Rt2L - 2 wire RTD low range. This selects the -180
o
C to +200
o
C range.
Rt2H - 2 wire RTD high range. This selects the -180
o
C to 650
o
C range for
Pt100 or -180
o
C to 550
o
C range for Pt1000 sensors.
Rt3L - 3 wire RTD low range. This selects the -180
o
C to +200
o
C range.
Rt3H - 3 wire RTD high range. This selects the -180
o
C to 650
o
C range for
Pt100 or -180
o
C to 550
o
C range for Pt1000 sensors.
Note: if the input type is changed each input will need to be recalibrated.
The low ranges cover only part of the RTD range this is to allow improved
accuracy over this range i.e. 0.1% of 380 against 0.1% of 730 or 830.
rtd
tYPE
100 or
1000 Selects RTD type from:
100 - Pt100 RTD input
1000 - Pt1000 RTD input
The choice made is common for all inputs i.e. if 100 is selected then a Pt100
input is required for all channels.
Page 14 of 27 PM4RT8MAN-1.4-0

Function Range Description
INPt
chnI
1to 4 or
1to 8Selects the number of input channels being used. Select 1to 4for three wire RTDs or 1to 8for two wire RTDs. For the purposes of correct display, relay
operation & retransmission it is important that the correct number of channels
is chosen since channels without inputs will be seenby the PM4 as a high
overrange and the error message "----" will be displayed for that channel.
SEt
dISP
SCAN,
HIGH,
Lo,
AUGE,
dIFF
dIF1
or ch1
to ch8
Selects the display operation mode from the choices below. In each case
below the ^or vbutton can be used to toggle between channels. If the
dISP unit function is set to NONE, “C or “F then the channel number will
be displayed prior to the reading for that channel.
SCAN - the display will automatically scroll through each channel. The time
each channel display is held is set by the SCAN dLAY function.
HIGH - the highest temperature will be displayed. When scrolling through the
displays using the ^or vbutton the message HIGH will be displayed prior to
the reading and if ch r or ch L is selected at the dISP unit function the
channel number with the highest reading will then be displayed alongside the
high value.
Lo -the lowest temperature will be displayed. When scrolling through the
displays using the ^or vbutton the message Lo will be displayed prior to
the reading and if ch r or ch L is selected at the dISP unit function the
channel number with the lowest reading will then be displayed alongside the
low value.
AUGE - the average of all temperatures will be displayed. When scrolling
through the displays using the ^or vbutton the message AUGE will be
displayed prior to the reading and if ch r or ch L is selected at the dISP
unit function the letter Awill then be displayed alongside the average value.
dIFF - the difference between the highest and lowest temperatures will be
displayed. When scrolling through the displays using the ^or vbutton the
message dIFF will be displayed prior to the reading and if ch r or ch L is
selected at the dISP unit function the letter dwill be displayed alongside
the difference reading.
dIF1 - the largest difference between channel 1 and the other channels used
will be displayed. If channel 1 is the lowest value the difference displayed will
be shown as a positive value. If channel 1 is the highest value then the
difference displayed will be a negative value. Whenscrolling through the
displays using the ^or vbutton the message dIF1 will be displayed prior to
the reading and if ch r or ch L is selected at the dISP unit function the
letter dwill be displayed alongside the difference reading.
ch1, ch2 etc. - the channel selected will be displayed as the default display.
dEG
tYPE
"C, "F
or AbS Sets the degree measurement type, choose from:
"C - displays in Centigrade
"F - displays in Fahrenheit
AbS - displays in Absolute (Kelvin)
DISP
unit
NONE
“C
“F
ch r
or
ch L
Display unit - certain display unit characters can be selected if required, to
display temperature units or to indicate which channel is being displayed.
Choices are:
NONE i.e.no display units e.g.23$5
“C e.g. 45"C
“F e.g. 18"F
Ce.g. 4%3C
ch r e.g. 23&6 4 where 4 is the channel shown right of temperature
ch L e.g. 4 23&6 where 4 is the channel shown left of temperature
Note that when a display unit is chosen it will take up one or two of the
available display digits, this may limit the maximum or minimum value which
can be displayed. If the number becomes to large to display then an error
message -or- will appear on the display.
The temperature display will be on the left of the display when chnI is
selected and on the right for the other choices.
Page 15 of 27 PM4RT8MAN-1.4-0

Function Range Description
SCAN
dLAY
0to
250 Sets the time for which each channel display is held when SEt dISP is set to SCAN. If set to 0the scanning operation will be disabled i.e. the display will
not automatically scan and must be manually scanned using the ^or v
button.
ch 1
CAL,
ch2
CAL etc.
n/a Temperature calibration foreach input channel.
The procedure for calibrating each channel is:
a. Ensure that an RTD input at a temperature of a known value is presentat
the input terminal of the channel being calibrated.
b. At the calibration function for the channel being calibrated e.g. ch1 CAL.
Press ^and vsimultaneously then release them. The display will indicate
the live input value. Do notbeconcerned at this stage if the live input display
value is notwhat is required. It is important that the live input value seen is a
steady value. If the display value does not become stable within 20 seconds
then the input needs to be investigated before proceeding with the scaling.
c. Press then release the Fbutton. The display will indicate Ch1 SCL (or
ch2 SCL etc.) followedby a value.Use the ^or vbutton to change this to
the known temperature value. Pressthe Fbutton toacceptchangesor the P
button to abort the scaling. If the scaling has been accepted there will be a
display message to indicate this when the Fbutton has been pressed e.g.
Ch1 CAL End.
UCAL
Ch1,
UCAL
Ch 2 etc.
n/a Uncalibration of selected channel - used to set the selected channel back to
the factory calibration values. This function should only be used when
calibration problems exist and it is necessary to clear the calibration memory.
To clear the memory press the ^and vbuttons simultaneously at the
functions. The message CAL CLr will be seen to indicate that the memory
has cleared.
P.but NONE,
Hi,
Lo ,
HiLo
or
A.cIr
Pbutton function - applicable only in models withfront panel Pbuttons.
The Pbutton may be set to operate some of the remote input functions, see
R.INP below for a description of these functions with the exception of FUNC
which is described below. The Pbutton is located at the front of 5 or 6 digit
LED models. If both the remote input and Pbutton function are operated
simultaneously the Pbutton will override the remote input. The functions
below are as described in the R.INP function below.
Functions available are: NONE (no operation),Hi(peak memory), Lo (valley
memory), HiLo (peak/valley memory toggle) or A.cIr (latching memory
reset or acknowledge).
Note: To prevent accidental operation of the Pbutton in the A.cIr function it
is necessary to hold the button in for 2 seconds to perform the selected
operation.
Page 16 of 27 PM4RT8MAN-1.4-0
REFERENCE
THERMOMETER
WATERBATH, CALIBRATOR
OR OTHER HEAT SOURCE
TEMPERATURE
PROBE
Temperature C
o

Function Range Description
R.INP NONE,
P.HLd
d.HLd
Hi,
Lo ,
HiLo,
SP.Ac,
No.Ac,
CAL.S,
duLL
or
A.cIr
Remote input function - terminals 7 and 8 at the rear of the instrument are the
remote input terminals. When these pins are short circuited, via a pushbutton
or keyswitch the instrument will perform the selectedremote input function. A
message will flash to indicate which function has been selected when the
remote input pins are short circuited. Some remote input and Pbutton
operations are also controlled by the SPFN ChnI function, the table below
each function below shows the effect of each setting on the operation. The
remote input functions are as follows:
NONE - no remote function required.
P.HLd -peakhold.Thedisplaywillshowthepeakvalueonlywhilsttheremote
input pins are short circuited.
Page 17 of 27 PM4RT8MAN-1.4-0
SPFN
ChnI
R.INP set to P.HLd
SCAN Scans all channels e.g. when set to SCAN if R.INP is set to
P.HLd (peak hold) then when the remote input is activated the
inputs will be scannedand the peak hold will operate on the
channel with the highest reading. If the channel number is being
displayed (see dISP unit function) then the channel number
for the input with the highest peak reading will be seen on the
display.
HIGH Operates in the same manner as SCAN above but does not
show the channel number, instead shows the letter Hif the
dISP unit function is set to show a channel number.
Lo Operates on the lowest of the inputs at the timee.g. when set to
Lo if R.INP is set to P.HLd (peak hold)then when the remote
input is activated the inputs will be scanned and the lowest of all
the inputs will be displayed. From then on the display will only
change if this low channel value increases i.e. goes more
positive i.e. the operation is allowing a peak hold of the channel
with the lowest value at the time the remote input was activated.
The letter Lwill be displayed if the dISP unit function is set
to show a channel number.
AUGE Operates on the average of the inputs at the time when set to
AUGE if R.INP is set to P.HLd (peak hold) then when the
remote input is activated the inputs will be scanned and the
average displayed, from then on the display will show the peak
average reading until the remote input is released. The letter A
will be displayed if the dISP unit function is set to show a
channel number.
dIFF Operates on the difference between the channels e.g. when set
to dIFF if R.INP is set to P.HLd (peak hold) then when the
remote input is activated the inputs will be scanned and the
largest difference between any two channels will be displayed,
from then on the display will show the maximumdifference
between any two channels until the remote input is released.
The letter dwill be displayed if the dISP unit function is set
to show a channel number.

Function Range Description
R.INP
continued NONE, P.HLd
d.HLd
Hi,
Lo ,
HiLo,
SP.Ac,
No.Ac,
CAL.S,
duLL
or
A.cIr
P.HLd - peak hold continued.
d.HLd - display hold. The display value will be held whilst the remote input
pins are short circuited.
Page 18 of 27 PM4RT8MAN-1.4-0
SPFN
ChnI
R.INP set to d.HLd (See P.HLd for further description)
SCAN Holds whichever channel is currently displayed
HIGH Hold whichever channel is the highest
Lo Holds whichever channel is the lowest
AUGE Holds the average of all channels
dIFF Holds the maximum difference between any channels
dIF1 Holds the maximum difference from channel 1
ch1 Channel 1 value held
ch2 to
ch 8 Selected channel number held
SPFN
ChnI
R.INP set to P.HLd
dIF1 Operates on the difference between channel 1 the remaining
channels e.g. when set to dIF1 if R.INP is set to P.HLd (peak
hold)then when the remote input is activated the inputs will be
scanned and the largest difference between channel 1 and the
remaining channels will be displayed, from then on the display
will show the maximum difference until the remote input is
released. The letter dwill be displayed if the dISP unit
function is set to show a channel number. Note that in this mode
the value displayed will be negative if channel 1 is the lowest
value.
ch1 Operates on channel 1 only e.g. when set to ch1 if R.INP is set
to P.HLd (peak hold) then when the remote input is activated the
display will show the peak value for channel 1. The channel
number will be displayed if the dISP unit function is set to
show a channel number.
ch2 to
ch 8 Operates on the selected channel, see ch1 above.

Function Range Description
R.INP
continued NONE, P.HLd
d.HLd
Hi,
Lo ,
HiLo,
SP.Ac,
No.Ac,
CAL.S,
duLL
or
A.cIr
Hi - peak memory. The peak value stored in memory will be displayed if the
remote input pins are short circuited, if the short circuit is momentary then the
display will return to normal measurement after 20 seconds. If the short circuit
is held for 1 to 2 seconds or the power is removed from the instrument then the
memory will be reset. Note if the operation is changed it is necessary to reset
the memory e.g. if changed from Hi to Lo.
Lo - valley memory. The minimum value storedin memory will be displayed.
Otherwise operates in the same manner as the Hi function. Note if the
operation is changed it is necessary to reset the memory e.g. if changed from
Hi to Lo.
HiLo - toggle between Hi and Lo displays. This function allows the remote
input to be used to toggle between peak and valley memory displays. The first
operation of the remote input will cause the peak memory value to be
displayed, the next operation will give a valley memory display. P Hi or P Lo
will flash before each display to give an indication of display type.
Page 19 of 27 PM4RT8MAN-1.4-0
SPFN
ChnI
R.INP set to HiLo (See P.HLd for further description)
Operates as above Hi and Lo but will toggle between high and low
readings each time remote input is activated.
SPFN
ChnI
R.INP set to Lo (See P.HLd for further description)
SCAN Shows whichever channel is or has been the lowest
HIGH Shows whichever channel is or has been the lowest
Lo Shows whichever channel is or has been the lowest then only
changes if this channel value decreases
AUGE Shows the lowest average of all channels
dIFF Shows the minimum differencebetween any channels
dIF1 Shows the minimum differencefrom channel 1
ch1 Shows channel 1 valley value
ch2 to
ch 8 Shows selected channel number valley value
SPFN
ChnI
R.INP set to Hi (See P.HLd for further description)
SCAN Shows whichever channel is or has been the highest
HIGH Shows whichever channel is or has been the highest
Lo Shows whichever channel is or has been the lowest then only
changes if this channel value increases
AUGE Shows the highest average of all channels
dIFF Shows the maximum difference between any channels
dIF1 Shows the maximum difference from channel 1
ch1 Shows channel 1 peak value
ch2 to
ch 8 Shows selected channel number peak value

Function Range Description
R.INP
continued NONE, P.HLd
d.HLd
Hi,
Lo ,
HiLo,
SP.Ac,
No.Ac,
CAL.S,
duLL
or
A.cIr
SP.Ac - setpoint access only. This blocks access to any functions except the
alarm setpoint functions unless the remote input pins are short circuited or
entry is made via CAL mode.
No.Ac - no access. This blocks access to all functions unless the remote input
pins are short circuited or entry is made via CAL mode.
duLL - display brightness control. The remote input can be used to change
the display brightness. When this mode is selectedthe display brightness can
be switched, via the remoteinput, between the brightness level set at the
brgt function and the brightness level set at the duLL function.
A.cIr - acknowledge or reset alarm, used when Ax Ltch is set to on i.e.
when using latching alarm relays. The remote inputcan be used to
acknowledge an alarm condition or reset the alarm. If the remote input is
activated when there is still an alarm condition then the alarm will be
acknowledged and the relay will automatically reset when the input moves out
of alarm condition. If the remote input is activated when the input has been in
an alarm condition but is no longer in alarm condition then the relay will
immediately reset. See Ax Ltch function for further description of latching
operation.
SPFN
chnI
SCAN,
HIGH,
Lo,
AUGE,
dIFF,
dIF1,
ch1,
ch2 to
ch8
Remote or Pbuttonfunction mode of operation. This function sets the
operation mode for the remote input (R.INP function) or Pbutton (P.but
function) operation. See R.INP function for a description of the operation of
the SPFN chnI functions.
ACCS OFF,
EASY,
NONE or
ALL
Access mode - the access mode function ACCS has four possible settings
namely OFF, EASY, NONE and ALL. If set to OFF the mode function has no
effect on alarm relay operation. If set to EASY the easy alarm access mode
will be activated, see details at the beginning of this chapter preceding the
A1Lo function. If set to NONE there will be no access to any functions via
FUNC mode, entry via CAL mode must be made to gain access to alarm and
calibration functions. If set to ALL then access to all functions, including
calibration functions, can be gained via FUNC mode.
SPAC A1,
A1-2
etc
Setpoint access - seen only if more than 1 relay fitted.
Sets the access to the alarm relay set points. The following choices are
available:
A1 - allows setpoint access to alarm 1 only.
A1-2 - allows access to alarms 1and 2.
A1-3 - allows access to alarms 1,2 and 3.
A1-4 - allows access to alarms 1, 2, 3 and 4
The remote input function (R.INP) must be set to SP.AC for this function to
operate. Note: Only the setpoints which have been given a value will be
accessible e.g. if A1Hi is set to OFF thenthere will be no access to the
A1Hi function when SPAC is used.
Page 20 of 27 PM4RT8MAN-1.4-0