KEP SC-FI Series, User Manual

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SC-FI Signal Conditioner
3
Description:
The SC-FI with option "L" is a two wire frequency to analog con-
verter that converts a pulse rate input into a 4-20 mA output signal
proportional to frequency or rate.
The SC-FI with option "L" is intended for use with lower full scale
input frequencies. Full scale frequencies of 15 Hz to 2000 Hz are
possible. The unit includes both a contact closure input and an
opto-isolated input. Output response time is selectable 1 or 10
seconds.
The amplified frequency signal is then converted to an analog
signal using a precision frequency to analog converter.
The output stage derives it’s power from the output current loop.
The output stage converts the input signal into the desired output
range. Multi-turn potentiometers provide for the necessary trim-
ming of span and zero.
SPECIFICATIONS:
Operating Temperature
32
°
F (0
°
C) to 158
°
F (70
°
C)
High Level Pulse Input
Type: Opto-Isolated
Logic 1: 4-30 VDC
Logic 0: 0-1 VDC
Frequency Range: 0-10 kHz
Fault Protection:
Reverse Polarity Protection
Over Voltage Protection
Isolation Voltage: 500 V
Fast Transient Immunity: 500 V
Maximum Rise Time: No Limit
Maximum Fall Time: No Limit
Contact Closure Input
Sensor Compatibility- Requires an isolated, contact closure
Maximum Contact Voltage- 5 V
Maximum Contact Current- 0.12 mA
Nominal Pullup Resistance - 47 Kohm to 5 Vdc
Frequency Range - 0-100 Hz
Frequency to Current Conversion
Range Selection: DIP Switch Selectable
Available Ranges:
30 Hz, 60 Hz, 120 Hz, 240 Hz,
480 Hz, 960 Hz, 1920 Hz
Factory Default: 100 Hz
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 (less than 500
Ω
)
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: 1 second (10 sec. jumper selectable)
Over-current Limiting: 35 mA
Output Loop Indicator:
LED illuminates when output loop is
powered by proper polarity and blinks
proportionally to the input frequency.
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.
Simplified Block Diagram
Typical Wiring Hookup (option "L")
1• Magnetic pickup
2• Magnetic pickup
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –
6• Shield (common)
7•
8• Output –
9• Do Not Use
REED
SWITCH
PULSER
DC
POWER
SUPPLY
ANALOG
4-20 mA
DEVICE
+
–
+
–
Contact Closure Hookup
High Level Pulse Hookup
F/V
V ref
Span
Zero
–
+
Contact
Closure
Input
3-30V
Input
Loop Powered
4-20mA Output
+
–
V/I
3.3k
Ω
47k
Ω
+5V
1• Not Used
2• Contact Closure In
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –
6• Shield (common)
7•
8• Output –
9• Do Not Use
DC
POWER
SUPPLY
ANALOG
4-20 mA
DEVICE
+
–
+
–
Flowmeter with
Switch Closure Output
"L" Option SPECIFICATIONS