Omega LDP-144 Series User manual

LDP-124 AND LDP-144 SERIES
FOR TEMPERATURE
http://www.omega.com
e-mail: info @ omega.com
User's Guide

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Page :1

Page : 2
CONTENTS
DESCRIPTION SECTION PAGE
===========================================================================
IMPORTANTSAFETYCONSIDERATIONS 13
UNPACKINGANDINSPECTION 24
MAINFEATURES 35
MODELS 46
LDP-1X4-MX,TEMPERATUREINDICATORFORRTDSENSOR (PT-100) 6
LDP-1X4-J1,J2TEMPERATUREINDICATORFORTHERMOCOUPLE"J"6
LDP-1X4-K1,K2TEMPERATUREINDICATORFORTHERMOCOUPLE"K"6
LDP-1X4-T1,T2TEMPERATUREINDICATORFORTHERMOCOUPLE"T"6
LDP-1X4-E1,E2TEMPERATUREINDICATORFORTHERMOCOUPLE"E"6
LDP-1X4-S1,S2TEMPERATUREINDICATORFORTHERMOCOUPLE"S"6
LDP-1X4-R1,R2TEMPERATUREINDICATORFORTHERMOCOUPLE"R"6
LDP-1X4-L1,TEMPERATUREINDICATORFORTHERMOCOUPLE"L"6
GENERALSPECIFICATIONS 57
FRONTVIEW,DESCRIPTION 67
REARVIEW,DESCRIPTION 77
WIRING 88
POWERSUPPLY,RECOMMENDEDWIRING. 8.1 8
FUSES. 8.2 8
SENSORCONNECTIONSFORMODELMX. 8.3 8
SENSORCONNECTIONS FORMODELS J1,K1,T1,E1,S1,R1,& L1. 8.4 8
TEMPERATURERANGES 99
MODELMX.SENSORTYPERTD(PT-100) 9.1 9
MODELSJ1,J2,K1,K2,T1,T2,E1,E2,S1,S2,R1,R2 &L1,SENSORTYPETHERMOCOUPLE 9.2 9
SIGNALCONDITIONERS 10 9
SIGNALCONDITIONERFORRTDSENSOR 10.1 9
SIGNALCONDITIONERSFORTHERMOCOUPLESENSORS 10.2 9
ADJUSTMENTANDCALIBRATIONPROCEDURE 11 10
RTDMODEL 11.1 10
THERMOCOUPLEMODELS 11.2 10
INSTALLATION 12 11
MECHANICALDIMENSIONS 13 11
WARRANTY 12
OTHERPRODUCTS 13

Page : 3
INSTALLATION
PRECAUTIONS.- The installation and
the future use of this
unit must be done by
suitable qualified per-
sonnel. The unit has
not AC (mains)
switch, it will be in op-
eration as soon as
power is connected.
The installation must incorporate an external main switch.
The unit has a protection fuse incorporated on the AC socket, if it
is necessary to change or replace, use the time-lag fuse according
IEC 127/2 and the values indicated below.
200 mA when the unit is operating at 230 Vac
400 mA when the unit is operating at 115 Vac.
Install also the necessary devices to protect the operator and the
process when using the unit to control a machine or process where
injurytopersonnelordamagetoequipmentorprocess,mayoccuras
a result of failure of the unit. See paragraph 8, WIRING.
SAFETY PRESCRIPTIONS.-
Theunithasbeendesigned andtestedunder EN61010-1rulesand
is delivered in good condition. This operator's manual contains
useful information for electrical connections. Do not make wiring
signal changes or connections when
power is applied to the unit. Make signal
connections before power is applied
and, if reconnection is required, discon-
nect the AC (mains) power before such
wiring is attempted.
Install the unit in places with a good
ventilation to avoid the excessive heat-
ing. And far from electrical noise source
or magnetic field generators such as
power relays, electrical motors, speed controls etc...
The unit cannot be installed in open places. Do not use until the
installation is finished.
POWERSUPPLY.-
Thepowersupplymustbeconnectedtotheadequateterminals (see
theconnectioninstructions).Thecharacteristicsofthepowersupply
areshowedonthelabelontherearpart.Pleasemakesurethattheunit
is correctly connected to a power supply of the correct voltage and
frequency.
Donotuseotherpowersupplyotherwisepermanentdamagemaybe
causedtotheunit.
Donotconnecttheunittopowersourcesheavilyloadedortocircuits
which power loads in cycle ON-OFF or to circuits which power
inductiveloads.
SIGNALWIRING.-
Certainconsiderationsmustbegivenwheninstallthesignalinputand
control wires. If the wires are longs can act like an antenna and
introducetheelectrical noisetothe unit,therefore:
Do not install the signal input wires in the same conduit with power
lines, heaters, solenoids, SCR controls etc....and always far from
theseelements.
When shielded wires are used, connect the shield to the common
terminalandleaveunconnectedtheotherendoftheshieldanddonot
connecttothemachineground.
1.- IMPORTANT SAFETY CONSIDERATIONS
SAFETY CONSIDERATIONS
PRESCRIPTIONS.-
Before starting any operation of adjustment, replacement,
maintenanceorrepair,theunitmustbedisconnectedfromanykind
ofpowersupply.
Keeptheunitclean,toassure goodfunctioning andperformance.
Use for it a clean and humid rag. Do not use for the frontal lens
abrasiveproducts,solvents,alcohol,etc...becauseitstransparence
couldbedamagedand this may causedifficultyfora correct vision
ofthereading.
To prevent electrical or fire hazard, do not expose the unit to
excessivemoisture.
Donotoperatetheunit
inthepresenceofflam-
mablegasesorfumes,
suchasenvironment
constitutes a definite
safetyhazard.Theunit
is designed to be
mounted in a metal
panel.
Iftheunitshowssignsofdamage,orisnotabletoshowtheexpected
measures, or has been stored in a bad conditions or a protection
failurecanoccur,thendonotattempttooperateandkeeptheunitout
ofservice.
IN CASE OF FIRE
1.- Disconnect the unit from the power supply.
2.-Givethealarmaccordingtothe local rules.
3.-Switchoffalltheairconditioningdevices.
4.-Attackthefirewith carbonicsnow,donotuse waterinanycase.
WARNING : In closed areas do not use systems with
vaporized liquids.
CONNECTIONS
All wiring connections are made using push-in cable connectors.
There is a separate connector block for power supply and input
signals.Pleasemakesurethateachconnectorblockisconnectedon
theadequateplace.
Thewirecrosssectionrecommendedforsignalinputsis1mm2and
for power supply 2.5 mm2.
PANEL MOUNTING
Verifythatthepanelcut-outiscorrectlyaccordingtothedimensions
indicated on page 11 with a minimum depth of 150 mm. (5.9").
Install the fixation pieces in the lateral guides of the unit by its rear
partandthenturnthescrew firmlyagainstthepanel,untiltheunitis
totallyholdon.
Seeparagraph12onpage11.

Page : 4
2.- UNPACKING AND INSPECTION
It is advisable to do a detailed reading of this Manual before mounting the instrument. This Operator's Manual
contains all the technical specifications : electricals as well as mechanics, both necessary to do a correct
installation and also a good use of the instrument.
At the same time the user will acquire the knowledge needed to obtain the best performances of the product.
Check that inside the present cardboard box, there are the following :
1Instrument Model LDP-1X4-MX, J1,J2, K1,K2, T1,T2,E1,E2, S1,S2, R1,R2 & L1.
1Operator'sManual.
1Connector forPowerSupply.
1 Screw-clamp connectors, 4 pins female for signal inputs.
2 Pieces for fixing the unit against the panel.
REFERENCEKEY
All models have a label on the rear part with their references printed on the following format :
LDP- 1X4-XX-X-X
Number of digits
4 = 4 digits
Display color
R = Red
G = Green
Model reference
Basic serie Power supply
0 = 230 Vac 50/60 Hz.
1 = 115 Vac 50/60 Hz.
Digit size
2 = 57 mm (2.3")
4 = 100 mm (4")
If there are some doubts or inquiries about the present instrument, please contact OMEGA
ENGINEERING´S customer service department.
When the shipment arrives remove the Packing List and verify that you have received all equipment.
Then inspect the box and the instrument, and if there is evidence of damage caused by bad handling during
the transport, it is advisable to make a careful inspection of all damages making a note of all of them and to
pass on this information directly to the Transport Company.
If this occurs but with insured material, ask the Transport Company for instructions about submitting a claim

Page : 5
3.- MAIN FEATURES
On this paragraph is detailed the main features for every one of the series which are the following :
Instruments of four digits plus polarity (only minus) to show temperature using the signal generated by sensors
type RTD(PT-100(0.00385),modelMX)orThermocouples(modelsJ1,J2,K1,K2,T1,T2,E1,E2,S1,S2,R1,R2
andL1).
All instruments of these two series also has circuitry to linearize the sensor signal and the value displayed is
proportionaltothemeasuredtemperaturein°Cor°Fforallrangecorrespondingtoeverysensor.
Seeparagraph 9,page9.
Serie LDP-124-XX : 4 digits type LED, seven segments, red or green colour with 57 mm (2.3") height and
minus sign for polarity.
Serie LDP-144-XX : 4 digits type LED, seven segments, red or green colour with 100 mm (4") height and
minus sign for polarity.
The complete reference for each instrument is obtained replacing the XX by the corresponding reference of
each temperature sensor.
The common features for all series are the following:
MECHANICAL.-
Housed in a rugged extruded aluminium profile housing for panel mounting or free standing.
Finished in anodized black colour. The frontal lens is mounted with a special rubber profile which
provides the front part of the unit with an IP-65 protection.
CONNECTIONS.-
Connections for Signal Inputs are made using one screw-clamp connector of four terminals located
on the rear part of the unit.
The recommended wire cross section for RTD sensors is 1 mm2.
For thermocouples must be used the compensate wire adequate for each thermocouple.
Connection for Power Supply uses a push-in cable connector with 2 terminals for power and 1
terminal for earth.
The fuse is located in the Power Supply socket, as well as the spare fuse.
SENSOR BREAK DETECTION.-
The linearizing circuits for RTD and for thermocouple sensors are provided with an special control to
detect when the sensor is broken or when the circuit sensor is opened.
If it occurs then the display starts to flash.
AUTOMATIC COMPENSATION.-
The variation resistance of the RTD sensors is in function of the temperature measured. To avoid
errorsduetotheleadwireresistance theLDP-1X4-MXusesa3-wiremeasurement,whichcompensates
theleadwireresistance.However2-wiresensorscanbeused.Seewiringconnections,paragraph8.3
page8.
The maximum resistance allowable is 10 Ω.
The thermocouple sensors generate a voltage produced by the junction of two metals with a different
characteristics. Therefore use the specific compensation wires for each model of thermocouple on
the measurement circuit to avoid create a new junction which should generate a small signal and it
should be added to the signal generated by the thermocouple sensor.
All instruments for thermocouple sensors are provided with a circuitry for Cold-Junction compensa-
tion.

Page : 6
4.- MODELS
LDP-1X4-MX
TemperatureindicatorforRTDsensor type PT-100 (100Ω at0°CAlpha=0.00385).Thismodeluses
the3-wire measurement,whichcompensates theleadwireresistance. However2-wiresensors
can be used too. See wiring connections.
Thesensorsignalislinearizedaccordingto IEC 751-DIN 43760.
The maximum excitation current is @1 mA.
LDP-1X4-J1,J2
TemperatureindicatorforthermocouplesensortypeJ(Fe-Kons).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to IEC 584; IPTS 1968; ANSI/MC96.1; DIN 43710.
LDP-1X4-K1,K2
TemperatureindicatorforthermocouplesensortypeK(NiCr-NiAl).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to IEC 584; IPTS 1968; ANSI/MC96.1; DIN 43710.
LDP-1X4-T1,T2
TemperatureindicatorforthermocouplesensortypeT(Cu-CuNi).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to IEC 584; IPTS 1968; ANSI/MC96.1; DIN 43710.
LDP-1X4-E1,E2
TemperatureindicatorforthermocouplesensortypeE(NiCr-CuNi).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to IEC 584; IPTS 1968; ANSI/MC96.1; DIN 43710.
LDP-1X4-S1,S2
Temperature indicator forthermocouple sensor type S(Pt-PtRh10%).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to IEC 584; IPTS 1968; ANSI/MC96.1; DIN 43710.
LDP-1X4-R1,R2
Temperatureindicator forthermocouplesensor typeR(Pt-PtRh13%).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to IEC 584; IPTS 1968; ANSI/MC96.1; DIN 43710.
LDP-1X4-L1
Temperatureindicatorforthermocouple sensor type LorDIN J (Fe-Kons).
Providedwith automaticCold-junctioncompensationand openmeasurecircuit detection.
The sensor signal is linearized according to DIN 43710.
Each model also has a circuitry to linearize the sensor signal,and the value displayed
is proportional to the measured temperature in °C or °F.

Page : 7
D
C
B
A
5.- GENERAL SPECIFICATIONS
DISPLAY
TYPE . . . . . . . . . . . . . . . . . . . . . . . . . 4 digits, 7 segments, red or
greenLED.
HEIGHTDIGIT . . . . . . . . . . . . . . . . . . 57 mm. (2.3") or 100 mm. (4").
RANGE . . . . . . . . . . . . . . . . . . . . . . . -9999 a 9999
POLARITY. . . . . . . . . . . . . . . . . . . . . Minus only (-).
OVERRANGE . . . . . . . . . . . . . . . . . . Display flashing.
DECIMALPOINT . . . . . . . . . . . . . . . . ModelsM1&M3.
ANALOG-TO-DIGITALCONVERSION
INPUTCONFIGURATION . . . . . . . . Single ended.
TECHNIQUE . . . . . . . . . . . . . . . . . . . . Dual slope, average value.
POLARITY. . . . . . . . . . . . . . . . . . . . . Automatic, only minus sign.
SIGNALINTEGRATIONPERIOD . . . . 100 ms.
READRATE . . . . . . . . . . . . . . . . . . . 2.5/s.
OSCILLATOR . . . . . . . . . . . . . . . . . . 400 KHz. quartz crystal.
ENVIRONMENTAL
OPERATINGTEMPERATURE . . 0 to +50 ºC (32 to 122 ºF).
STORAGETEMPERATURE . . . . -20 to +85 º C (-4 to 185 ºF).
RELATIVEHUMIDITY . . . . . . . . 0 to 85 % not condensed.
PROTECTION. . . . . . . . . . . . . . . IP65. (Front part only).
MECHANICAL
DIMENSIONS . . . . . . . . . . . . . . . See table in page 11.
PANELCUTOUT . . . . . . . . . . . . See table in page 11.
DEPTH . . . . . . . . . . . . . . . . . . . . See table in page 11.
WEIGHT . . . . . . . . . . . . . . . . . . . See table in page 11.
CASEMATERIAL . . . . . . . . . . . Aluminium extruded.
FINISHED . . . . . . . . . . . . . . . . . . Anodized, black colour.
ELECTRICAL
STANDARDPOWERSUPPLY . 115 Vac. ±10% 50 / 60 Hz.
(Optionally 230 Vac)
POWERCONSUMPTION . . . . . . See table in page 11.
6.- FRONT VIEW, for both series
Decimal point.
Model M1 & M3
Polarity
indicator
7.- REAR VIEW, for both series
Attaching screws
Signal input
connector
Power Supply
Vac + Earth, fuse and
spare fuse.

Page : 8
3-wires connection. 2-wires connection.
Do not forget to link
terminal A
to
terminal C.
D
C
B
A
D
C
B
A
Signal
input
connector. Thermocouple
+
_
PT-100
PT-100
8.- WIRING
8.1.- POWER SUPPLY, RECOMMENDED WIRING
Power switch
POWER SUPPLY
115 Vac (230 Vac Optional).
FUSE and spare fuse.
8.2.- PROTECTION FUSES
The unit has a protection fuse located on the power supply
socket.
If this fuse must be replaced or changed because the power
supply is changed, use the time-lag fuse according to IEC
127/2 with the values indicated on the table.
Power Fuse
Supply value
230 Vac 0.2 A
115 Vac 0.4 A
8.4.- SENSORCONNECTIONSFOR MODELS:J1,J2,K1,K2,T1,T2,E1,E2,S1,S2,R1,R2&L1.
8.3.-SENSOR CONNECTIONSFOR MODEL:MX.
Signal input
connector.

Page : 9
9.- TEMPERATURE RANGES
± 0.5 %
C
B
A
PT1. ZERO adjust
COMPONENTS SIDE
PT2.SPANadjust.
The control board contains the Analog/Digital con-
verter, the Signal Conditioner and other compo-
nents.
The function of the Signal Conditioner is amplifier
and make the linearisation of the signal received
fromthesensorandthereisoneSignalConditioner
for every model of RTD or Thermocouple sensor.
ThetrimmersforSpanandZeroarealsolocatedon
theSignalConditioner.Usethesetrimmersonlyfor
calibration procedure.
Signalconditioner
Componentsside.
Componentsview
ALL MODELS
0°C to + 50°C
32°F to 122°F
Controlboard. HorizontalpositionininstrumentsserieLDP-124
VerticalpositionininstrumentsserieLDP-144
JG JE JF
DecimalPoint
Selector
JG = XXX.X
JE = X.XXX
JF = XX.XX
10.1.- SIGNAL CONDITIONER FOR RTD SENSOR
C
B
A
PT1 ZEROadjust. COMPONENTS SIDE
Signal Instrument
Conditioner Reference
Reference
MB-21 LDP-1X4-M1 *
MB-21-F2 LDP-1X4-M2
MB-21-F3 LDP-1X4-M3 *
PT2 SPANadjust.
All jumpers on Decimal Point Selector must be opened.
10.2.- SIGNAL CONDITIONERS FOR THERMOCOUPLE SENSORS
9.1.- MODEL M1, M2 & M3. RTD SENSOR (PT-100)
TEMPERATURE ACCURACY MODEL TEMPERATURE ACCURACY RESOLUTION
RANGE RANGE
Signal Instrument
Conditioner Reference
Reference
MB-22 or 22F LDP-1X4-J1,J2
MB-23 or 23F LDP-1X4-K1,K2
MB-24 or 24F LDP-1X4-T1,T2
MB-25 or 25F LDP-1X4-E1,E2
MB-26 or 26F LDP-1X4-S1,S2
MB-27 or 27F LDP-1X4-R1,R2
MB-28 LDP-1X4-L1
MODEL TEMPERATURE ACCURACY RESOLUTION MAXIMUM
RANGE (±1 COUNT) COMPENSATION
M1 - 100.0 to + 650.0 °C 0.1 °C
M2 -300 to 1526 °F 1 °F 10Ω
M3 - 200.0 to 999.9 °F 0.1 °F
Allowable error in negative range due to the lead wire resistance : 0.2°C/Ω or 0.4°F/Ω
9.2.- MODELS:J1,J2,K1,K2,T1,T2,E1,E2,S1,S2,R1,R2 &L1. THERMOCOUPLESENSORS
10.- SIGNAL CONDITIONERS.
± 1 count ± 1 count
MODEL
J1
K1
T1
E1
S1
R1
L1
± 0.5 %
± 0.5 %
± 0.5 %
± 0.5 %
± 0.5 %
± 0.2 %
± 0.2 %
± 0.2 %
± 0.1 %
± 0.3 %
± 0.3 %
± 1 %
J2
K2
T2
E2
S2
R2
1°C / 1°F
1°C / 1°F
1°C / 1°F
1°C / 1°F
1°C / 1°F
1°C / 1°F
1°C
- 50 to + 600°C
0 to + 1250°C
+ 1000 to + 1750°C
- 50 to + 400°C
0 to + 650°C
+ 970 to + 1750°C
- 50 to + 600°C
- 40 to 1000°F
32 to 2250°F
- 40 to 750°F
32 to 1200°F
1775 to 3150°F
1850 to 3150°F
AMBIENTTEMP.
COMPENSATION
± 0.2 %
± 0.4 %
± 0.4 %
* Jumper JG located on Decimal Point Selector must be closed.