Omega Products DRG-SC-RTD Installation Manual

SPECIFICATIONS

Input

Sensor Types: Pt100, Pt500,

Pt1000 (α: 0.00385Ω/Ω/°C
or 0.00392Ω/Ω/°C);

Cu10, Cu25, Cu100.
Sensor Connection: 3-wire.
Input Ranges: see table 1.
Common Mode(Input to Ground):
1800VDC, max.
Zero Turn-Up: 50% of full scale

range

Span Turn-Down: 50% of full

scale range

Excitation Current

<2mA for Pt100, Pt500, Pt1000;

<5mA for Cu100;

<10mA for Cu10, Cu25.

Leadwire Resistance

40% of base sensor resistance or

100Ω(whichever is less), max per
lead.

Leadwire Effect

Less than 1% of the maximum
input temperature span

Output

Voltage Output

Output: 0-5V, 0-10V

Source Impedance: <10Ω

Drive: 10mA, max.

(1KΩ, min @10V)
Current Output

Output: 0-1mA, 0-20mA,

4-20mA

Source Impedance: >100KΩ

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Compliance:
0-1mA; 7.5V, max.(7.5KΩ)
0-20mA; 12V, max.(600Ω)
4-20mA; 12V, max.(600Ω)

LED Indication (green)

Input Range (approx.)
>110% input; 8Hz flash
<0% input: 4Hz flash
CAL LED "ON" = OK

Accuracy (Including Linearity,
Hysteresis)

±0.1% typical, ±0.2% max. of the

maximum input temperature

range configurable for the RTD

type; @ 25°C ambient and 0Ω

lead resistance.

Stability

±0.015% of the max. input
temperature range for the RTD

type per °C change in ambient

temperature, max.

Response Time (10 to 90%)

200mSec., typical.

Common Mode Rejection

DC to 60Hz: 120dB

Isolation

1800VDC between input, output

and power.

EMC Compliance (CE Mark)

Emmissions: EN50081-1
Immunity:EN50082-2

Temperature Range

Operating: 0 to 55°C ( 32 to 131°F)
Storage: -25 to 70°C (-13 to 158°F)

Wire Terminations

Screw terminals for 12-22 AWG

Power

Consumption: 1.5W typical,

2.5 W Max.

Range: 9-30VDC

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 or 35mm DIN rail

PIN CONNECTIONS

11 No Internal Connection
12 No Internal Connection
13 No Internal Connection
21 DCPower (+)
22 DC Power (-)
23 No Internal Connection
41 RTD Input (+)
42 RTD Input (-)
43 RTD Return
51 Output (+)
52 Output (-)
53 No Internal Connection

Safety: EN50178

Humidity (Non-Condensing)

Operating: 15 to 95%( @ 45°C)
Soak: 90% for 24 hours( @ 65°C)

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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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WARNING: These product are not designed for use in, and should not be used for, patient connected applications.

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RETURN REQUEST/ INQUIRIES

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair
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2. Model and serial number of product, and

3. Repair instructions and/or specific problems relative to the
product.

1

DRG-SC-RTD
RTD Input, Field Configurable Isolator

Instruction Sheet M2400/0796

1. Choose the desired temperature
range from table 1 or 2 depending on
RTD type.

2. With DC power off, position input
switches 1 through 5 on “SW2” for
the desired temperature range (Table

3).

3. Set position 6 through 8 of input
range switch “SW2” for the desired
RTD type (Table 4).

4. Set position 1 through 8 of excita­tion switch “SW3” for the desired
RTD type (Table 5).

5. Set position 1 through 8 of output
range switch “SW1” for the desired
output signal (Table 6).

CALIBRATION

1. After configuring the dip switches,
connect the input to a calibrated RTD
source or decade resistance box.
Connect the output to the actual de­vice load (or a load approximately
equivalent to the actual device load
value) and apply power.

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 equalibrium of the
system.

2. Set the calibrator to the desired
minimum temperature and adjust the
zero potentiometer for the desired
minimum output.

3. Set the calibrator to the desired
maximum temperature and adjust
the span potentiometer for the de­sired maximum output.

4. Repeat steps 2 and 3, as neces­sary for best accuracy.

721-0614-00B 8/97

DESCRIPTION

The DRG-SC-RTD is a DIN rail
mount, RTD input signal conditioner
with 1800VDC isolation between in­put, output and power. The field
configurable input and output offers
flexible, wide ranging capability for
Platinum and Copper RTDs.

The input of the DRG-SC-RTD can
be configured for any one of up to
sixteen temperature ranges (see
Tables 1 & 2). The output is linear to
the RTD temperature input 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 sixteen switch selectable
ranges. For example, the 0-100°C
range could be offset and turned
down to provide a 4-20mA signal
representing 0-50°C (or 50-100°C).

APPLICATION

The DRG-SC-RTD field configurable
RTD input isolator is useful in elimi­nating ground loops and interfacing
RTD sensors to data acquisition and
control systems.

Three way isolation completely elimi­nates ground loops from any source.
Isolation protects expensive SCADA
systems from ground faults and sig­nificantly reduces the effect of high
common mode voltages which are
prevalent in many RTD applications.

The constant current RTD excitation
circuitry uses the third lead of the
RTD to sense and compensate for
the RTD lead resistance, resulting in
an accurate RTD temperature mea­surement.

High density DIN rail mounting of­fers an extremely compact solution
for saving valuable panel space.

DIAGNOSTIC LED

The DRG-SC-RTD is equipped with
a dual function LED signal monitor.
The green, front mounted LED indi­cates both DC power and input sig­nal status. Active DC power is indi­cated by an illuminated LED. If the
input signal is more than 110% of
the full scale range, the LED will
flash at 8Hz. Below 0%, the flash
rate is 4Hz.

CONFIGURATION

A major advantage of the
DRG-SC-RTD is its wide ranging
capabilities and ease of configura­tion. The DRG-SC-RTD has 16
input temperature range settings,
six RTD type settings and five out­put range settings. Trim potentiom­eters allow 50% input zero and span
adjustability within each of the 16 full
scale input ranges.

Unless otherwise specified, the fac­tory presets the Model
DRG-SC-RTD as follows:

Input: Pt100Ω
Range: -200 to 600°C
Output: 4-20mA

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 6 and reconfigure switches
SW1, SW2 and SW3 for the desired
input type, range and output.

WARNING: Do not attempt to
change any switch settings with
power applied. Severe damage will
result!

(+)

Table 1: DRG-SC-RTD Platinum RTD
Temperature Ranges

Table 3: Temperature Input
Range Switch Settings
(SW2 -1 through 5)

Table 4: RTD Input Type
Switch Settings
(SW2 - 6 through 8)

Table 2: DRG-SC-RTD Copper RTD
Temperature Ranges

SW2-1: Has no function

Table 5: Excitation Type Switch
Settings (SW3 -1 through 8)

SW3-8: Has no function

Table 6: Output
Switch Settings
(SW1 - 1 through 8)

Figure 1:DGR-SC-RTD Factory Calibration:

-200 to 600°C (Pt 100) input; 4-20mA output

Figure 2: Mechanical Dimensions for DGR-SC-RTD

Note1: All 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.

Figure 3: Wiring Diagram for DGR-SC-RTD

RTD Input

RTD Input (-)
RTD Return

Figure 4: RTD Reference

Designations