DESCRIPTION
The DRG-AR-RTDisaDINrailmount,
RTDinputlimitalarmwithdualsetpoints
andtwocontactclosureoutputs. The
fieldconfigurableinputandalarmfunc-
tions offer flexible setpoint capability.
There are up to eight temperature
rangesavailableforeachRTDtypeto
ensureaccuracyandmaximizesetpoint
resolution.
TheDRG-AR-RTDisconfigurableasa
singleordualsetpointalarm,withHIor
LO trips and failsafe or non-failsafe
operation. Also included are adjust-
abledeadbands(1.0to5%offullscale
input) for each setpoint and a flexible
DC power supply which accepts any
voltagebetween9and30VDC.
DIAGNOSTICLEDS
The DRG-AR-RTD is equipped with
three front panel LEDs. The first is a
dualfunctionLEDlabeledINPUT. This
green LED indicates line power and
inputsignalstatus. ActiveDCpoweris
indicatedbyanilluminatedLED. Ifthis
LEDisoff,checkDCpowerandwiring
connection. Iftheinputsignalismore
than 110% of full scale, the LED will
flashat8Hz. Below0%,theflashrate
is 4 Hz.
TworedLED’sindicatetherelaystate
for each setpoint. An illuminated red
LED indicates the tripped condition.
OUTPUT
TheDRG-AR-RTDisequippedwithtwo
SPDT(formC)relays,ratedat120VAC
or28VDCat5amperes. Eachofthese
relays is independently controlled by
the field configurable setpoint and
deadband.
OPERATION
The field configurable
DRG-AR-RTDlimitalarmsetpointscan
be configured for HI or LO, failsafe or
non-failsafe operation. Each of the
setpoints has a respective HI or LO
deadband. Inatrippedcondition,the
setpoint is exceeded and the appro-
priateredLEDwillilluminate. Thetrip
willreset only when the processfalls
belowtheHIdeadbandorrisesabove
theLOdeadband(seeFigure1). For
proper deadband operation, the HI
setpointmustalwaysbesetabovethe
LOsetpoint.
In failsafe operation, the relay is en-
ergizedwhentheprocessisbelowthe
HI setpoint or above the LO setpoint
(opposite for non-failsafe). In the
failsafemode,apowerfailureresults
inanalarm state output.
DYNAMICDEADBAND
LSIcircuitryintheDRG-AR-RTDpre-
vents false trips by repeatedly sam-
plingtheinput. Theinputmustremain
beyond the setpoint for 100 millisec-
onds, uninterrupted, to qualify as a
valid trip condition. Likewise, the
inputmustfalloutside the deadband
andremaintherefor100milliseconds
to return the alarm to an untripped
condition. Thiseffectivelyresultsina
“dynamic deadband” —based on
time— in addition to the normal
deadband.
CONFIGURATION
Unlessotherwisespecified,the
factory presets the Model
DRG-AR-RTDasfollows:
Input: Platinum (100W)
Range: 0 to 250°C
Output: Dual,SPDT
Trip: A:HI, B:LO
Failsafe: No
Deadband: A, B: 1.0%
The DC power input accepts any
DC source between 9 and 30V;
typically a 12V or 24VDC source is
used.
For other I/O ranges, refer to
Tables 1 through 3 and reconfigure
switches SW1 and SW2 for the
desired input type, range and
function.
WARNING: Do not attempt to
change any switch settings with
power applied. Severe damage will
result!
Input
1. With DC power off, position input
switches 1 through 6 on “SW2” for
RTD type (see Table 1).
2. Set position 1 through position 4
of input range switch “SW1” for the
desired RTD type and input temper-
ature range (Table 3).
3. Set position 5 and 6 of input
range switch “SW1” to ON for a HI
trip setpoint or OFF for a LO trip
setpoint (Figure 4).
4. Set position 7 of input range
switch “SW1” to ON for non-failsafe
operation or OFF for failsafe
operation (e.g. alarm trips upon
power failure).
50
100
Process (% of Span)
Time
Relay Trips
(LED Red)
Relay Trips
(LED Red)
Relay returns to its
untripped condition
(LED Off)
Relay returns to its
untripped condition
(LED off)
} 10% Deadband
} 10% Deadband
Setpoint
Illustrating HI Setpoint
Illustrating LO Setpoint
Figure1:Limitalarmoperationand
effectofdeadband(s).
DRG-AR-RTD
RTD Input, Field Configurable Limit Alarm
Instruction Sheet M2395/0796
RelayContacts
2 SPDT (2 form C) Relays
1Relaypersetpoint
CurrentRating(resistive)
120VAC:5A
240VAC:2A
28VDC:5A
Material:Silver-CadmiumOxide
ElectricalLife:105operationsatrated
load
Note:External relay contact
protectionisrequiredforusewith
inductive loads (see Figures 2 & 3).
MechanicalLife:107operations
AgencyApprovals
CSAcertifiedperstandardC22.2,
No.0-M91and142-M1987(FileNo.
LR42272).ULrecognizedperstandard
UL508(FileNo.E99775).CECompli-
anceperEMCdirective89/336/EEC
andlowvoltage73/23/EEC.
Mounting
32mm and 35mm DIN Rail
PINCONNECTIONS
11 N.O.RelayB
12 Com. Relay B
13 N.C.Relay B
21 DC Power (+)
22 DC Power (-)
23 NoConnection
41 RTDInput(+)
42 RTDInput(-)
43 RTDReturn
51 N.O.RelayA
52 Com.RelayA
53 N.C.RelayA
NormalMode(analogfiltering):
<250mSec,(10-90%)
Setpoints
Effectivity:Setpointsareadjust-
ableover100%oftheselected
inputspan
Repeatability(constanttemp.):
±0.2%offullscale
Stability
LineVoltage:±0.01%/%,max.
Temperature:±0.05%offull
scale/°C, max.
Common Mode Rejection
DCto 60Hz: 120dB
>60Hz:100dB
Isolation
1800VDCbetweencontacts,
inputandpower
EMC Compliance (CE Mark)
Emissions:EN50081-1
Immunity:EN50082-2
Safety:EN50178
Humidity(Non-Condensing)
Operating:15to95%(@45°C)
Soak:90%for 24 hours(@65°C)
Temperature Range
Operating:-15to55°C
(5to131°F)
Storage:-25to75°C
(-13to158°F)
Power
Consumption:1.5Wtypical,
2.5W max.
SupplyRange:9to30VDC,
inverterisolated
In-rushCurrent:300mA,max.
SPECIFICATIONS
Inputs
SensorTypes:Pt100,Pt500,
Pt1000(0.00385Ω/Ω/°C);
Cu10,Cu100;Ni120,NiFe604
SensorConnection:3-wire.
InputRanges:seetable1.
ExcitationCurrent(Maximum)
<2mAforPt100,Pt500,Pt1000,
Ni120,Cu100orNiFe604
<10mAforCu10,Cu25.
Leadwire Resistance
40% of base sensor resistance or
100Ω(whichever is less), maximum
perlead.
Leadwire Effect
Less than 1% of selected span
overentireleadwireresistance
range.
Input Protection
NormalMode:Withstands±5VDC.
CommonMode(InputtoGround):
1800VDC,max.
LEDIndicators
InputRange(Green)
>110%input:8Hzflash
<0%input:4Hzflash
Setpoint(Red)
Tripped:Solidred
Safe:Off
LimitDifferentials(Deadbands)
1.0%to 5% of span
Response Time
DynamicDeadband:Relaystatus
willchangewhenproper
setpoint/processcondition
exists for 100msec.
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721-0608-00B 7/97
