DESCRIPTION
The DRG-AR-RTD is a DIN rail mount,
RTD input limit alarm with dual setpoints
and two contact closure outputs. The
field configurable input and alarm func-
tions offer flexible setpoint capability.
There are up to eight temperature
ranges available for each RTD type to
ensure accuracy and maximize setpoint
resolution.
The DRG-AR-RTD is configurable as a
single or dual setpoint alarm, with HI or
LO trips and failsafe or non-failsafe
operation. Also included are adjust-
able deadbands (1.0 to 5% of full scale
input) for each setpoint and a flexible
DC power supply which accepts any
voltage between 9 and 30VDC.
DIAGNOSTIC LEDS
The DRG-AR-RTD is equipped with
three front panel LEDs. The first is a
dual function LED labeled INPUT. This
green LED indicates line power and
input signal status. Active DC power is
indicated by an illuminated LED. If this
LED is off, check DC power and wiring
connection. If the input signal is more
than 110% of full scale, the LED will
flash at 8 Hz. Below 0%, the flash rate
is 4 Hz.
Two red LED’s indicate the relay state
for each setpoint. An illuminated red
LED indicates the tripped condition.
OUTPUT
The DRG-AR-RTD is equipped with two
SPDT (form C) relays, rated at 120VAC
or 28VDC at 5 amperes. Each of these
relays is independently controlled by
the field configurable setpoint and
deadband.
OPERATION
The field configurable
DRG-AR-RTD limit alarm setpoints can
be configured for HI or LO, failsafe or
non-failsafe operation. Each of the
setpoints has a respective HI or LO
deadband. In a tripped condition, the
setpoint is exceeded and the appro-
priate red LED will illuminate. The trip
will reset only when the process falls
below the HI deadband or rises above
the LO deadband (see Figure 1). For
proper deadband operation, the HI
setpoint must always be set above the
LO setpoint.
In failsafe operation, the relay is en-
ergized when the process is below the
HI setpoint or above the LO setpoint
(opposite for non-failsafe). In the
failsafe mode, a power failure results
in an alarm state output.
DYNAMIC DEADBAND
LSI circuitry in the DRG-AR-RTD pre-
vents false trips by repeatedly sam-
pling the input. The input must remain
beyond the setpoint for 100 millisec-
onds, uninterrupted, to qualify as a
valid trip condition. Likewise, the
input must fall outside the deadband
and remain there for 100 milliseconds
to return the alarm to an untripped
condition. This effectively results in a
“dynamic deadband” —based on
time— in addition to the normal
deadband.
CONFIGURATION
Unless otherwise specified, the
factory presets the Model
DRG-AR-RTD as follows:
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
Pr
oc
es
s
(%
o
f
S
pan)
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
Figure 1: Limit alarm operation and
effect of deadband(s).
DRG-AR-RTD
RTD Input, Field Configurable Limit Alarm
Instruction Sheet M2395/0796
Relay Contacts
2 SPDT (2 form C) Relays
1 Relay per setpoint
Current Rating (resistive)
120VAC: 5A
240VAC: 2A
28VDC: 5A
Material: Silver-Cadmium Oxide
Electrical Life:10
5
operations at rated
load
Note: External relay contact
protection is required for use with
inductive loads (see Figures 2 & 3).
Mechanical Life: 10
7
operations
Agency Approvals
CSA certified per standard C22.2,
No. 0-M91 and 142-M1987 (File No.
LR42272).UL recognized per standard
UL508 (File No.E99775).CE Compli-
ance per EMC directive 89/336/EEC
and low voltage 73/23/EEC.
Mounting
32mm and 35mm DIN Rail
PIN CONNECTIONS
11 N.O. Relay B
12 Com. Relay B
13 N.C. Relay B
21 DC Power (+)
22 DC Power (-)
23 No Connection
41 RTD Input (+)
42 RTD Input (-)
43 RTD Return
51 N.O. Relay A
52 Com. Relay A
53 N.C. Relay A
Normal Mode (analog filtering):
<250mSec, (10-90%)
Setpoints
Effectivity: Setpoints are adjust-
able over 100% of the selected
input span
Repeatability (constant temp.):
±0.2% of full scale
Stability
Line Voltage: ±0.01%/%, max.
Temperature: ±0.05% of full
scale/°C, max.
Common Mode Rejection
DC to 60Hz: 120dB
>60Hz: 100dB
Isolation
1800VDC between contacts,
input and power
EMC Compliance (CE Mark)
Emissions: EN50081-1
Immunity: EN50082-2
Safety: EN50178
Humidity (Non-Condensing)
Operating: 15 to 95% (@45°C)
Soak: 90% for 24 hours (@65°C)
Temperature Range
Operating: -15 to 55°C
(5 to 131°F)
Storage: -25 to 75°C
(-13 to 158°F)
Power
Consumption: 1.5W typical,
2.5W max.
Supply Range: 9 to 30VDC,
inverter isolated
In-rush Current: 300mA, max.
SPECIFICATIONS
Inputs
Sensor Types: Pt100, Pt500,
Pt1000 (0.00385
Ω
/
Ω
/°C);
Cu10, Cu100; Ni120, NiFe604
Sensor Connection: 3-wire.
Input Ranges: see table 1.
Excitation Current (Maximum)
<2mA for Pt100, Pt500, Pt1000,
Ni120, Cu100 or NiFe604
<10mA for Cu10, Cu25.
Leadwire Resistance
40% of base sensor resistance or
100
Ω
(whichever is less), maximum
per lead.
Leadwire Effect
Less than 1% of selected span
over entire leadwire resistance
range.
Input Protection
Normal Mode: Withstands ±5VDC.
Common Mode(Input to Ground):
1800VDC, max.
LED Indicators
Input Range (Green)
>110% input: 8Hz flash
<0% input: 4Hz flash
Setpoint (Red)
Tripped: Solid red
Safe: Off
Limit Differentials (Deadbands)
1.0% to 5% of span
Response Time
Dynamic Deadband: Relay status
will change when proper
setpoint/process condition
exists for 100msec.
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WARRANTY/DISCLAIMER
RETURN REQUEST/ INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER
MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
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FOR WARRANTY RETURNS, please have the following information
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1.
P.O. number under which the product was PURCHASED,
2.
Model and serial number of the product under warranty, and
3.
Repair instructions and/or specific problems relative to the product
OMEGA ENGINEERING, INC. warrants this unit to be free of manufacturing defects for the life of the product.
If the unit should malfunction, it must be returned to the factory for evaluation. OMEGA's Customer Service Department will issue an Authorized Return
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FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair
charges. Have the following information available BEFORE contacting OMEGA:
1.
P.O. number to cover the COST of the repair,
2.
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3.
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ã Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced to any
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The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter
specifications without notice.
WARNING: These product are not designed for use in, and should not be used for, patient connected applications.
721-0608-00B 7/97
