SC-II Series
Current to Current Signal Conditioner
http://www.kep.com
99537 07/24/01
KESSLER-ELLIS PRODUCTS
10 Industrial Way East
Eatontown, NJ 07724
800-631-2165 • 732-935-1320
Fax 732-935-9344
THIS PAGE IS BLANK
INDEX
DESCRIPTION ..................................................................................1
APPLICATION...................................................................................1
OPERATION .....................................................................................1
SPECIFICATIONS.............................................................................1
INPUT & OUTPUT SETTINGS..........................................................2
REMOVING THE CASE .........................................................2
LED INDICATORS..................................................................2
OUTPUT ADJUSTMENTS .....................................................2
RESPONSE TIME SETTINGS ...............................................2
INPUT/OUTPUT JUMPER SETTINGS ..................................2
DIMENSIONS....................................................................................3
WARRANTY ......................................................................................3
DECODING PART NUMBER ............................................................3
THIS PAGE IS BLANK
SC-II Signal Conditioner
DESCRIPTION:
The SC-II is a DIN rail mount, loop powered current isolator. The SCII provides an isolation barrier of 500V from the input to the output.
The SC-II standard configuration is: 4-20mA IN and 4-20mA out. The
following Configurations are available with solder jumpers.
INPUT OUTPUT
4/20mA 10/50mA
10/50mA 4/20mA
10/50mA 10/50mA
APPLICATION:
Loop powered isolators are used to isolate process signals
transmitted between field instruments, KEP Flow Computers,
Programmable Logic Controllers, Distributed Control Systems, And
Data Acquisition Systems. Field devices such as flow, level, and
temperature transmitters, are used to monitor and control a
manufacturing process. The isolation provided by the SC-II prevents
ground loops and also provides protection against high voltage and
current spikes which are detrimental to digital signals.
OPERATION:
The SC-II operates as a two-wire transmitter. The input derives its
power from 4-20mA current loop. The output is typically powered
by a 24VDC power supply, thus allowing 14VDC for other devices
connected in the current loop. The output of the SC-II is isolated
from the input and is also protected from reverse polarity . Zero and
Span pots are provided for calibration.
SPECIFICATIONS:
Operating Temperature
32° F (0°C) to 158°F (70°C)
Analog Output
Accuracy: ± 0.1% Span (@ 20° C)
Output Type: Two Wire, Loop Powered
Range: 4-20 mA (10 - 50 mA optional)
Compliance Voltage: 10 to 40 VDC
Loop Burden: < 10 VDC
Trim Controls: Zero & Span, non-interacting
Span (20 mA) Trim Range: 50% to 100% of full scale
Linearity: < ±0.1% Span
Output Voltage Effect: < ± 0.002% Span/Volt
Temperature Effect: < 200 PPM/C°
Reverse Polarity Protected
Noise Content: < 0.2% Span
Response Time: 0.1 second (1 sec. jumper selectable)
Over-current Limiting: 35 mA
Mounting Styles
DIN Rail Mount: Plastic enclosure with a snap fastener for
fitting to DIN 46 277 and DIN EN 50 022
assembly rails.
NEMA 4X: 4.92" x 4.92" NEMA 4X Enclosure for wall
mounting.
Explosion Proof: Aluminum enclosure for:
Class I, Division 1, Groups B, C & D
Class II, Division I, Groups E, F & G.
Terminal Designations
1• 4-20mA INPUT +
2• 4-20mA INPUT 3• N/C
4• N/C
5• N/C
6• N/C
7• 4-20mA OUTPUT +
8• 4-20mA OUTPUT 9• N/C
Simplified Block Diagram
+
1
4-20mA
Input
Loop
–
2
I/F F/I
Span
Zero
7
+
4-20mA
Output Loop
8
–
Typical Wiring Hookup
4-20mA
Output
4-20 mA Output Device
1
+
–
SC-II
1 7
2 8
+
+24 V
–
4-20mA In
4-20 mA Input Device
SC-II Signal Conditioner
E9
E10
E12
E5
E14
E13
E6
E15
E1
E4
E11
20271
REVA
INPUT & OUTPUT SETTINGS
REMOVING THE CASE:
The case must be removed to change switch settings. To
remove the case procede as follows:
Refer to FIGURE 1. Using finger tips, carefully pry the
case away from the terminal blocks (as shown with
dotted lines).
Pry far enough to release the restraining clips on both
sides of the case.
Press up on terminal block with thumbs. The assembly
will pop out allowing it to be removed from case.
FIGURE 1
1 2 3
OUTPUT ADJUSTMENTS:
The unit has two potentiometers for adjustment. The lower
potentiometer controls the 4mA set point and the uppers
potentiometer controls the 20mA set point. To adjust the output,
connect 4mA and adjust the lower potentiometer. Then connect
20mA and adjust the upper potentiometer.
FIGURE 2:
1 2 3
SPAN Adjust
(CCW-Up, CW-Down)
ZERO Adjust
(CCW-Down, CW-Up)
7 8 9
INPUT LED
INDICATOR
OUTPUT LED
INDICATOR
7 8 9
LED INDICATOR:
The SC-II has two LED indicators. The upper LED illuminates
when at least 4mA is connected to the unit. The lower LED
illuminates when the output side is powered.
RESPONSE TIME SETTING:
Jumper J1 controls the output response time.
JUMPER J1 RESPONSE TIME
OFF 0.1 second (DEFAULT)
ON 1 second
Close Jumper J1 to provide damping of the output resulting in a 1
second response time.
Input/Output Jumper Settings:
Bottom View of PC Board
4/20-4/20 XXXXXX
4/20-10/50 XXXXXXXX
Input-Output E1 E4 E5 E6 E9 E10 E13 E14 E15
10/50-4/20 XXXXXX X
10/50-10/50 XXXXXXXXX
X = Jumper Closed
2
Dimensions
SC-II Signal Conditioner
DIN Rail Mount
WARRANTY
This product is warranted against defects in
materials and workmanship for a period of two
(2) years from the date of shipment to Buyer.
.89
(22.5)
Mounting holes molded
directly under cover screws.
Max. screw head .29"
(Typ. 4 places)
4.21
(107)
PANEL INSTALLED
5.06
(129)
1.40 (35.5)
2.95 (75)
NEMA4X
To access terminals, remove
4.21
(107)
4.92
(125)
TOP VIEW
cover and 4 panel screws.
4.92
(125)
.43
(11)
Explosion Proof Enclosure
3/4” NPT (2) HLS.
(feed thru hubs)
.18 (5)
SIDE VIEW
3.88 (98.5)
2.95
(75)
1.93
(49)
The Warranty is limited to repair or replacement of the defective unit at the option of the
manufacturer. This warranty is void if the product has been altered, misused, dismantled, or
otherwise abused.
ALL OTHER WARRANTIES, EXPRESSED
OR IMPLIED, ARE EXCLUDED, INCLUDING
BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Kessler - Ellis Products Co.
10 Industrial Way East
Eatontown, NJ 07724
(732) 935- 1320
Toll Free 800 - 631 - 2165
Fax (732) - 935 - 9344
Decoding Part Number
Example SC-II D ET
Series
II= Current to Current
7.125
(181)
5.44
(138)
4.06
(103.2)
2 MTG LUGS
0.31 DIA.
Mounting:
B= Nema 4X
C= Explosion Proof
D= DIN Rail
Options:
ET= Extended Temp (-20° to 85° C)
Accessories: (add to end of part number)
DR-4= 4" DIN Rail
3
Loading...