Omega Products DRG-AR-AC User Manual

DRG Series Field Configurable Limit
Alarm Modules

H-29

$

289

Basic Unit

⻬ Models Available for

Thermocouples, RTDs,
DC and AC Voltage
and Current

⻬ Easy Field

Configurable Ranges

⻬ Adjustable Setpoints

Programmable HI
or LO and Failsafe
or Non-Failsafe

The DRG-AR Series modules
are a family of DIN rail mount limit
alarms with dual setpoints and two
contact closure outputs. The field
configurable input and alarm
functions offer flexible setpoint
capability. Modules are available
for a variety of input types including
thermocouples, RTDs, DC and AC
current and voltages.

Each module can be set to a
number of input ranges via an input
selector switch. The alarm points
and dead band are adjusted by
potentiometers.

Model Price Input Type

DRG-AR-AC $289 AC Voltage and Current
DRG-AR-DC 289 DC Voltage and Current
DRG-AR-RTD 289 RTD
DRG-AR-TC 289 Thermocouple

Diagnostic LEDs

All modules are equipped with
3 front panel LEDs. The first is a
dual function LED labeled input.
This green LED indicates line power
and input signal status. Two red
LEDs indicate the relay state for
each setpoint. An illuminated red
LED indicates the tripped condition.

Output

The DRG-AR Series modules are
equipped with two SPDT relays,
rated at 120 Vac or 28 Vdc at
5 amperes. Each of these relays
is independently controlled by the
field configurable setpoint and
deadband.

Operation

The field configurable 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 low deadband. In failsafe
operation, the relay is energized
when the process is below the HI
setpoint or above the LO setpoint
(opposite for non-fail-safe). In the
fail-safe mode, a power failure
results in an alarm state output.

A/IN
DI/O

A/OUT

ALL MODELS AVAILABLE FOR FAST DELIVERY!

H-30

H

Specifications

DRG-AR-AC
Range (Voltage Mode):

100 mV to 200 Vac

Impedance (Voltage Mode):

>100KΩ

Overload (Voltage Mode):

300 Vac, max.

Range (Current Mode):

10 mA to 100 mAAC

Impedance (Current Mode):

20Ω, typical

Overcurrent (Current Mode):

200 mAAC

Overvoltage (Current Mode):

60V peak

Frequency Range: 40 to 400 Hz
Limit Differentials (Deadbands):

>50 mV/5 mA: 0.25% to 5% of span
<50 mV/5 mA: 1% to 5% of span

Setpoint Repeatability (Constant
Temperature): 0.2% of full scale

DRG-AR-DC
Range (Voltage Mode):

10 mV to ±200 V

Impedance (Voltage Mode):

>100KΩ

Overload (Voltage Mode):

200 VRMS, max.

Range (Current Mode):

1 mA to ±100 mA

Impedance (Current Mode):

20Ω, typical

Overcurrent (Current Mode):

170 mA RMS max.

Overvoltage (Current Mode):

60 Vdc

Limit Differentials (Deadbands):

>50 mV/5 mA: 0.25% to 5% of span
<50 mV/5 mA: 1% to 5% of span

Setpoint Repeatability
(constant temp):

>50 mV/5 mA: 0.1% of full scale
<50 mV/5 mA: 0.2% of full scale

Excitation:

24 Vdc, 20 mA maximum

321

654

17,7
(.70)

90.0

(3.54)

88.5

(3.48)

105.2

(4.14)

35 mm RAIL

110.2

(4.34)

32 mm RAIL

DIMENSIONS ARE IN MM (INCHES)

Dynamic DeadBand

LSI circuitry in the DRG-AR Series
prevents false trips by repeatedly
sampling the input. The input must
remain beyond the setpoint for
100 milliseconds 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.

DRG-SC-RTD:
Sensor Types: RTD, Pt100, Pt500,

Pt1000 (␣ = 0.00385); Cu10,
Cu100, Ni 120, Ni Fe 604

Sensor Connection: 3 wire
Range: See Range Table
Excitation Current: <2 mA for

Pt100, Pt500, Pt1000; <5mA for
Cu100, Ni 120 or Ni Fe 604

Lead Wire Resistance: 40%
of base sensor resistance or 100Ω
(whichever is less), max. per lead

Lead Wire Effect: Less than
1% of the maximum input
temperature span

Limit Differentials (Deadbands):

1.0 to 5% of span

Setpoint Repeatability (Constant
Temperature): ±0.2% of full scale

DRG-SC-TC
Ranges: See Range Table
Bias Current (Burnout Detection):

<1.5 microamp

Impedance: >1MΩ
Overvoltage: ±10 V differential
Limit Differentials (Deadbands):

0.25 to 5% of span

Setpoint Repeatability (Constant
Temperature): 0.2% for temp

> 0°C. 0.3% for temp < 0°C

SPECIFICATIONS COMMON
TO ALL MODULES

Relay Contacts

2 SPDT (2 form C) Relays
1 Relay per setpoint
Current Rating: 120 Vac: 5A,
240 Vac: 2A, 28 Vdc: 5A
Material: Silver-Cadium Oxide
Electrical Life: 10

5

operations

Isolation: 1800 Vdc between
input, contacts and power

RESPONSE TIME
Dynamic Deadband: Relay status

will change when proper setpoint
condition exists for 100 msec

Normal Mode (Analog Filtering):

<250 msec, (10-90%)
Mounting: Standard 32mm

or 35mm DIN rail
Wire Termination: Screw:

Termination for 12-22 AWG
ESD Susceptibility: Meets IEC

801-2, Level 2 (4 KV)

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: -25 to 70°C (-13 to 158°F)

Power: 9-30 Vdc, 1.5 W typical,

2.5 W max