Dwyer Instruments SERIES SCD-8 Catalog Page
Series
2-1/2 [63.50]
4-21/64 [109.86]
3-35/64
[89.92]
SCD-8
Multi-Loop DIN Rail Mount Temperature Controller
Up to 8 Control Loops, Optional Display
Shown with optional display and additional inputs and outputs.
The Series SCD-8 Multi-Loop DIN Rail Mount Temperature Controller can be used
to control up to 8 independent PID control circuits. The base unit comes standard with 4
thermocouple or 3 RTD input channels. Additional input cards can be purchased if needed,
but the additional inputs must be of the same type as the inputs that came with the base
unit. If more than 8 loops are required or to mix input types, SCD-2000 slave modules can
be added without wiring additional power or communications cables. Each loop can be
programmed either through the standard RS-485 serial communications or an optional plug
in LED display module.
Each control loop will have two outputs and a single input. The outputs can be configured
for dual loop control or for a control loop and an alarm. One of the two outputs for each
control loop must be a relay or pulsed voltage output.
Base Units
Input/Output Modules
TEMPERATURE
For Factory Configured Models, Relay Outputs are standard on Output Sub1
(and Sub2 if 8 inputs selected).
Example
Construction
Input Selection
Controllers
Output 1 Card
Selection
Temperature/Process
Output 2 Card
Selection
Options
Model
SCD-8000
SCD-8100
Model
SCD-4T
SCD-3R
SCD-42
SCD-43
SCD-45
SCD-46
Input Type
Thermocouple
RTD
Input/Output Type
4 Thermocouple Inputs
3 RTD Inputs
4 Pulse Voltage Outputs
4 Relay Outputs
4 Current Outputs
4 Linear Voltage Outputs
X
SCDM-8
SCDM-8
X
0
1
2
3
0
2
3
5
6
SPECIFICATIONS
Input: Thermocouple: RTD (depending on model, see chart).
Display: Optional, single row 7 segment LED display, 4 bit PV = Red, SV = Green.
Supply Voltage: 24 VDC, isolated switching power supply.
Power Consumption: 10W + (3W x # of SCD-2000 modules).
Operating Temperature: 32 to 122°F (0 to 50°C).
Memory Backup: Non-volatile memory.
Control Output Ratings:
Relay output: SPST, 3A @ 250 VAC resistive;
Voltage pulse: Output: 24 VDC max, 40 mA;
Current output: 4 to 20 mA (resistive load < 500 Ω) (output 1 or 2 only);
Linear voltage: 0 to 10 VDC (resistive load > 1000 Ω) (output 1 or 2 only).
Communications: RS-485 Modbus
Weight: 10 oz (425 g).
Agency Approvals: CE, cUL, UL.
ACCESSORIES
SCD-PS, 100 to 240 VAC/VDC to 24 VDC Power Supply
SCD-LED, Optional LED Display Module
MN-1, Mini-Node™ USB/RS-485 converter
A-600, R/C snubber
SCD-SW, Configuration Software
See Series SCD on page 269 for slave modules.
X
X
SCDM-8XXX-X
Multi-Loop DIN Rail Mount
Temperature Controller
4 Thermocouple Inputs
3 RTD Inputs
8 Thermocouple Inputs
6 RTD Inputs
None
Pulsed Voltage
Relay
Current
0
2
3
5
6
Linear Voltage
None
Pulsed Voltage
Relay
Current
Linear Voltage
LED
LED Display
PV
Pulsed Voltage on Alarm Output Sub 1 & Sub 2
Input Sensor Types
Temperature measurement
resistance (Cu50)
Platinum resistance (Pt100)
Platinum resistance (JPt100)
Thermocouple TXK type
Thermocouple U type
Thermocouple L type
Thermocouple B type
Thermocouple S type
Thermocouple R type
Thermocouple N type
Thermocouple E type
Thermocouple T type
Thermocouple J type
Thermocouple K type
Note: The default setting in SCD-8000 is
“thermocouple K type”. The default setting in SCD8100 is “Pt100”.
Modbus® is a registered trademark of Schneider Automation, Inc.
®
A-5-11/RTU communication protocol.
SCD-8100/SCD-3R
SCD-8000/SCD-4T
Range
-50 to 150°C
-200 to 600°C
-20 to 400°C
-200 to 800°C
-200 to 500°C
-200 to 850°C
100 to 1800°C
0 to 1700°C
0 to 1700°C
-200 to 1300°C
0 to 600°C
-200 to 400°C
-100 to 1200°C
-200 to 1300°C
268
DWYER INSTRUMENTS, INC.
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