Omega Products DRG-AR-RTD Installation Manual

SPECIFICATIONS

Inputs

Sensor Types: Pt100, Pt500,

Pt1000 (0.00385Ω/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
100Ω (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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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.

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
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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.

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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.

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'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.

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

load

Note: External relay contact

protection is required for use with

inductive loads (see Figures 2 & 3).

Mechanical Life: 107 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 Compli­ance 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

WARRANTY/DISCLAIMER

RETURN REQUEST/ INQUIRIES

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.

5

operations at rated

721-0608-00B 7/97

DRG-AR-RTD
RTD Input, Field Configurable Limit Alarm

Instruction Sheet M2395/0796

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 func­tions 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 adjust­able 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 appro­priate 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 en­ergized 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 pre­vents false trips by repeatedly sam­pling the input. The input must remain
beyond the setpoint for 100 millisec­onds, 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.

Illustrating LO Setpoint

Illustrating HI Setpoint
Setpoint

100

Relay Trips
(LED Red)

50

Relay Trips
(LED Red)

Time

Relay returns to its

untripped condition

(LED off)

Process (% of Span)

Figure 1: Limit alarm operation and
effect of deadband(s).

Relay returns to its

untripped condition

(LED Off)

} 10% Deadband
} 10% 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: N o
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 temper­ature 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).

CALIBRATION

(+)

1. After configuring the DIP switches,
connect the input to a calibrated RTD
source or a resistance decade box and
apply power. (Figure 6).

Table 3: Input Range switch settings (SW1-1 through 4)

ON

1 2 3 4 5 6 7 8

NOTE: To maximize thermal stability, final
calibration should be performed in the op­erating installation, allowing approximately
1 to 2 hours for warm up and thermal
equilibrium of the system.

2. Setpoint: set deadband at its mini­mum (fully counter clockwise) before
adjusting the setpoint. With the desired
trip RTD resistance input applied, ad­just setpoint until the relay trips. For HI
trip calibration, start with the setpoint
above the desired trip (full clockwise).
For LO trip calibration, start below the
desired trip (full counter clockwise).

3. Deadband: Set deadband to its
minimum (fully counter clockwise).
Set the setpoint to desired trip. Adjust
RTD resistance input until relay trips.
Readjust deadband to 5% (fully clock­wise). Set RTD resistance input to
desired deadband position. Slowly
adjust deadband until relay untrips

Table 1: RTD Input Type switch
settings (SW2 - 1 through 6)

*Note: Resistance values for Pt 500(Ω) and Pt 1000(Ω) are 5 and 10 times the resistance
value of Pt100 (Ω), respectively.

Input Range
See Table 1

"B" HI Trip ON
"B" LO Trip OFF

Figure 4: DRG-AR-RTD Input Range/Function Selection (SW1)

RELAY PROTECTION AND
EMI SUPPRESSION

When switching inductive loads,
maximum relay life and transient
EMI suppression is achieved using
external protection (see Figures 2
and 3). Place all protection devices
directly across the load and mini­mize all lead lengths. For AC induc­tive loads, place a properly-rated
MOV across the load in parallel with
a series RC snubber. Use a 0.01 to

0.1µF pulse film capacitor (foil
polypropylene recommended) of
sufficient voltage, and a 47Ω,
1/2W carbon resistor. For DC
inductive loads, place a diode across
the load (PRV > DC supply, 1N4006
recommended) with (+) to cathode
and (-) to anode (the RC snubber is
an optional enhancement).

"A" HI Trip ON
"A" LO Trip OFF

Factory Default Settings

+

Relay

Contacts

(optional)

Figure 2: DC Inductive Loads

Relay

Contacts

Figure 3: AC Inductive Loads

Load

47 ohm

1/2W

Load

47 ohm

1/2W

Diode

MOV

0.1uF
Film

0.1uF
Film

Non-Failsafe ON
Failsafe OFF

Power

-

Power

Not Used ON
Not Used OFF

Figure 5: DRG-AR-RTD Factory Calibration;

0-250°C (Pt 100), A-HI/B-LO, Non-Failsafe

Warning:

to change any switch
settings with power applied.
Severe damage may occur!

Do not attempt

Table 2: Setpoint Function switch
settings (SW1 - 5 through 8)

Note1: All DRG Series modues are designed and tested to operate in ambient temperatures from 0 to 55°C, when
mounted on a horizontal DIN rail. When five or more modules are mounted on a vertical rail, circulating air or model
DRG-HS01 Heat Sink is recommended.

RTD Input

RTD Input (-)
RTD Return

Figure 6: Wiring Diagram for DRG-AR-RTD

Figure 7: Mechanical Dimensions for DRG-AR-RTD