Omega DRG-SC-TC, Instruction Sheet

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DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION
The DRG-SC-TC is a DIN rail mount,
thermocouple input signal conditioner
with 1800VDC isolation between in-
put, output and power. The field
configurable input and output offer
flexible, wide ranging capability for
J, K, T, R, S, E and B type thermo-
couples.
The input of the DRG-SC-TC can be
configured for over 60 different ther-
mocouple temperature ranges (see
Table 6). The output is linear to
temperature and can be set for either
0-5V, 0-10V, 0-1mA, 0-20mA or
4-20mA.
Wide ranging, precision zero and
span pots allow 50% adjustablity of
offset and span turn-down within each
of the ranges. For example, the 0-
1000°C range could be offset and
turned down to provide a 4-20mA
signal representing 500-1000°C.
Similarly, adjustment can be refer-
enced to the output range. The
example from above could be used
to provide a 12-20mA signal from a
750 to 1000°C temperature input.
APPLICATION APPLICATION APPLICATION APPLICATION APPLICATION
The DRG-SC-TC field configurable
thermocouple input isolator is useful
in eliminating ground loops and inter-
facing thermocouple sensors to data
acquisition and control systems.
Three way isolation completely elimi-
nates ground loops from any source.
Isolation protects expensive SCADA
systems from ground faults and al-
lows the noise reduction benefits of
grounded thermocouples to be real-
ized.
The DRG-SC-TC employs the latest
in advanced analog signal process-
ing technology. In addition to its
CONFIGURATION CONFIGURATION CONFIGURATION CONFIGURATION CONFIGURATION
An advantage of the DRG-SC-TC is
its wide ranging capabilities and ease
of configuration. The DRG-SC-TC
enables 50% input zero and span
adjustablity DRG-SC-TC within each
of the full-scale input ranges.
Unless otherwise specified, the
factory presets the Model
DRG-SC-TC as follows:
Input: J-type
Range: 0 to 500°C
Output: 4 to 20mA
Burn Out: Upscale
The DC power input accepts any DC
source between 9 and 30V; typically
a 12V or 24VDC source is used (see
Accessories).
For other I/O ranges refer to Tables
1 through 6 and reconfigure switches
SW1 and SW2 for the desired input
type range and output.
WARNING: WARNING:
WARNING: WARNING:
WARNING:
Do not attempt to change
any switch settings with power applied.
Severe damage will result!
1. Choose the desired temperature
range from table 6, then use table 1
and 2 to configure the switches, as
described in the following steps, for
thermocouple type and range.
2. With DC power off, position input
switches 1 and 2 on "SW2" for the
desired burnout detection mode.
3. Set positions 4 through 10 on
"SW2" for the desired thermocouple
range and type.
4. Set positions 1 through 8 of output
range switch "SW1" for the desired
output signal. (Table 4)
* Application Specific Integrated Circuit
multiple microprocessors, a special
ASIC* chip is used for high accuracy
and reliability. The DRG-SC-TC is
also equipped with cold junction com-
pensation (CJC) circuitry to provide
ice-point reference. Upscale or
downscale thermocouple burnout
detection is switch selectable.
High density DIN rail mounting offers
an extremely compact solution to
save valuable panel space.
DIAGNOSTIC LEDS DIAGNOSTIC LEDS
DIAGNOSTIC LEDS DIAGNOSTIC LEDS DIAGNOSTIC LEDS
The DRG-SC-TC is equipped with
front panel LEDs for INPUT (green),
TROUBLE (yellow) and CAL OK (yel-
low). At start-up, both the INPUT
and the CAL OK LEDs flash alter-
nately for 10 seconds while start-up
takes place.
INPUT LED INPUT LED INPUT LED INPUT LED INPUT LED
This green LED is lit continuously
when the input is within the specified
range. In the full temperature range
setting, for the over range condition
the LED flashes at 8Hz, whereas for
the under range condition it flashes
at 4Hz. In a sub-range temperature
setting, for the over range condition
the LED flashes at 1Hz, whereas for
the under range condition it flashes
at 0.5Hz.
CAL OK LED CAL OK LED
CAL OK LED CAL OK LED
CAL OK LED
This yellow LED is continuously on
when the device is calibrated.
TROUBLE LED TROUBLE LED
TROUBLE LED TROUBLE LED
TROUBLE LED
This yellow LED is off during the
normal operation of the device. Con-
sult factory if this LED is on, indicat-
ing a microprocessor malfunction.
DRG-SC-TC
Thermocouple Input, Field Configurable Isolator
Instruction Sheet M2397/0796
SPECIFICATIONS SPECIFICATIONS
SPECIFICATIONS SPECIFICATIONS
SPECIFICATIONS
IIIII
nputs nputs
nputs nputs nputs
Sensor Types: J, K, T, R, S, E, B
Input Ranges: see table 6.
Impedance: >1M
Ω
Bias Current (burnout detection):
<1.5microamp
Overvoltage: ±10V differential
Common Mode (Input to Ground):
1800VDC, max.
Zero and Span Adjustability Zero and Span Adjustability
Zero and Span Adjustability Zero and Span Adjustability Zero and Span Adjustability
50% of any selected range
Output Output Output Output Output
Voltage Output
Output: 0-5V, 0-10V
Source Impedance: <10
Ω
Drive: 10mA, max.
Current Output
Output: 0-1mA, 0-20mA,
4-20mA
Source Impedance: >100K
Ω
Compliance:
0-1mA; 7.5V, max.(7.5K
Ω
)
0-20mA; 12V, max.(600
Ω
)
4-20mA; 12V, max.(600
Ω
)
Accuracy Accuracy
Accuracy Accuracy Accuracy (Including Linearity,
Hysteresis) see Table 5
Stability Stability Stability Stability Stability
+0.04% of the maximum full scale
range per ºC change in ambient
temperature, maximum.
Response Time (10 to 90%) Response Time (10 to 90%) Response Time (10 to 90%) Response Time (10 to 90%) Response Time (10 to 90%)
500mSec., typical.
Common Mode Rejection Common Mode Rejection Common Mode Rejection Common Mode Rejection Common Mode Rejection
DC to 60Hz: 120dB
Isolation Isolation
Isolation Isolation
Isolation
1800VDC between input, output
and power.
EMC Compliance EMC Compliance EMC Compliance EMC Compliance EMC Compliance
Emissions: EN50081-1
Immunity: EN50082-2
Safety: EN50178
LED Indication LED Indication LED Indication LED Indication LED Indication
TROUBLE LED: Yellow, off during
normal device operation.
INPUT LED: Green, continuously on
if input is within selected range,
flashes otherwise
CAL OK LED: Yellow, continuously
on in normal device operation
Thermocouple Burnout Detect Thermocouple Burnout Detect Thermocouple Burnout Detect Thermocouple Burnout Detect Thermocouple Burnout Detect
Field configurable upscale,
downscale, or disabled
Humidity (Non-Condensing) Humidity (Non-Condensing) Humidity (Non-Condensing) Humidity (Non-Condensing) Humidity (Non-Condensing)
Operating: 15 to 95% (@ 45°C)
Soak: 90% for 24 hours (@ 65°C)
Temperature Range Temperature Range Temperature Range Temperature Range Temperature Range
Operating: 0 to 55°C (32 to 131°F)
Storage: -25 to 70°C (-13 to 158°F)
Power Power
Power Power Power
Consumption: 1.5W typical,
2.5W max.
Range: 9 to 30VDC
Terminations and Wire Terminations and Wire Terminations and Wire Terminations and Wire Terminations and Wire
Screw terminals for 12-22 AWG.
Use twisted pair for output and
power connections.
Agency Approvals Agency Approvals Agency Approvals Agency Approvals Agency Approvals
CSA CSA
CSA CSA CSA certified per standard C22.2,
No. 0-M91 and 142-M1987 (File No.
LR42272). UL
UL UL UL UL recognized per stan-
dard UL508 (File No.E99775).
CE CE CE CE CE
Conformance per EMC directive
89/336/EEC and low voltage 73/
23/EEC.
Mounting Mounting
Mounting Mounting
Mounting
32mm or 35mm DIN rail
PIN CONNECTIONS PIN CONNECTIONS
PIN CONNECTIONS PIN CONNECTIONS PIN CONNECTIONS
11
DC Power(+)
12 DC Power (-)
13 No Connection
41 T/C Input(+)
42 T/C Input (-)
43 No Connection
21 DC Power (+)
22 DC Power(-)
23 No Connection
51 Output (+)
52 Output (-)
53 No Connection
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product
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
Copyright 1996 OMEGA ENGINEERING, INC. All rights reserved. This documentation may not be copied, photocopied, reproduced, translated,
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721-0616-00B 8/97