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DESCRIPTION
The DRG-AR-TC is a DIN rail mount,
thermocouple input limit alarm with
dual setpoints and two contact closure
outputs. The field configurable input
and alarm functions offer flexible
setpoint capability. There are up to six
temperature ranges available for each
thermocouple type to ensure accura-
cy and maximize setpoint resolution.
A bipolar input switch is provided for
temperature ranges below 0°C.
The DRG-AR-TC is configurable as a
single or dual setpoint alarm, with HI or
LO trips, upscale or downscale ther-
mocouple burnout detection and
failsafe or non-failsafe operation. Also
included are adjustable deadbands
(0.25 to 5% of full scale input) for each
setpoint and a flexible DC power sup-
ply which accepts any voltage be-
tween 9 and 30VDC.
DIAGNOSTIC LEDS
The DRG-AR-TC is equipped with
three front panel LEDs. The first is a
dual function LED labeled INPUT.
This green LED indicates DC power
and input signal status. Active DC
power is indicated by an illuminated
LED. If this LED is off, check line
power and wiring connection. If the
input signal is more than 110% of the
full scale range, 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-TC 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 set
point and deadband.
OPERATION
The field configurable DRG-AR-TC
limit alarm setpoints can be config-
ured 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 low 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-TC 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 con-
dition. This effectively results in a
“dynamic deadband” —based on
time— in addition to the normal
deadband.
Figure 1: Limit alarm operation and
effect of deadband(s).
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
CONFIGURATION
Unless otherwise specified, the
factory presets Model DRG-AR-TC as
follows:
Input: J Type
Range: 0 to 350°C
Output: Dual, SPDT
Trip: A: HI, B: LO
Failsafe: No
Deadband: A, B: 0.25%
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
Table 1 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!
1. With DC power off, position switch
SW1-1, 2, 3 and SW2-
1 through 6 for the desired input range
(Table 1).
2. Set positions 4 and 5 of function
switch “SW1” to ON for a HI trip
setpoint or OFF for a LO trip setpoint
(Figure 4).
3. Set position 6 of function switch
“SW1” to ON for non-failsafe opera-
tion or OFF for failsafe operation (e.g.
alarm trips upon power failure).
4. Set positions 7 and 8 of function
switch "SW1" to upscale or downscale
burn-out.
DRG-AR-TC
Field Configurable Limit Alarm
Instruction Sheet M2398/0796
SPECIFICATIONS
Inputs
Range: See Table 1
Impedance: >1 Megaohm
Input Bias Current (burnout
detection): <1.5 microamp
Overvoltage: ±10V differential
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)
0.25% to 5% of span
Response Time
Dynamic Deadband:
Relay status will change when
proper setpoint/process condition
exists for 100msec
Normal Mode (analog filtering):
<250msec, (10-90%)
Setpoint
Effectivity: Setpoint(s) are adjustable
over 100% of the selected input
span
Repeatability (constant temp.):
0.2% for temp > 0°C
0.3% for temp < 0°C
Stability
Temperature: ±0.05% of full
scale/°C, max.
Common Mode Rejection
DC to 60Hz: 120dB
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: 0 to 55°C (32 to 131°F)
Storage: -15 to 70°C (5 to 158°F)
Power
Consumption: 1.5W typical,
2.5W max.
Supply Range: 9 to 30 VDC,
inverter isolated
In-rush Current: 300mA, max.
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 relay
protection Figures 2 & 3).
Mechanical Life: 10
7
operations
Wire Termination
Screw terminations for 12-22 AWG
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 Conformance 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 T/C Input (+)
42 T/C Input (-)
43 No Connection
51 N.O. Relay A
52 Com. Relay A
53 N.C. Relay A
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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
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.
FOR WARRANTY RETURNS, please have the following information
available BEFORE contacting OMEGA:
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 (AR) number
immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or replaced at no charge. OMEGA's
WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design
limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of being damaged
as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA's
control. Components which wear are not warranted, including but not limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by
it will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED,
EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order,
whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no
event shall OMEGA be liable for consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a "Basic Component" under 10 CFR 21 (NRC), used in or with any nuclear
installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application,
used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and additionally, purchaser will
indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.
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. Model and serial number of product, and
3. Repair instructions and/or specific problems relative to the product.
OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and
engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
ã Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated, or reduced to any
electronic medium or machine-readable form, in whole or in part, without prior written consent of OMEGA ENGINEERING, INC.
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European
New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
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.
721-0609-00A 8/96