KEP SC-FI Data sheet

SC-FI Series

Features:

• Magnetic Pickup or Contact Closure Input

• Optically Isolated Input

• 10 kHz Maximum Input Frequency

• Standard, 2-Wire, 4-20 mA Output

• Two Year Warranty

• Loop Powered

• Various Mounting Styles

• LED Indicator

Frequency to Current
Signal Conditioner

SIGNAL CONDITIONERS

Flow Instruments

Description:

The SC-FI is a two wire frequency to analog converter that
converts a pulse rate input into a 4-20 mA output signal propor­tional to frequency or rate.

The input pulse rate is amplified and filtered by the input signal
conditioning circuitry. Two forms of input signal conditioning are
provided, one for magnetic pickups or contact closure inputs and
the other is an isolated pulse input (depending on order code).

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 analog input signal into the de­sired output range. Multi-turn potentiometers provide for the nec­essary trimming of span and zero.

Specifications:
Operating Temperature

32° F (0°C) to 158°F (70°C)

High Level Pulse Input

Type: Opto-Isolated
Input Impedance: 3.3 kΩ
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

Magnetic Pickup Input

Differential Input
Input Impedance: 10 kΩ
Frequency Response: 0-3500 Hz
Trigger Sensitivity: 30 mV p-p
Over Voltage Protection: ± 30 VDC

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:

Standard

150 Hz, 300 Hz, 600 Hz, 1200 Hz,
2500 Hz, 5000 Hz, 10,000 Hz

Factory Default: 1000 Hz

Contact Closure Option

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
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)
Overcurrent 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.

Listing: CE Compliant

Kessler-Ellis Products • 800-631-2165 F-15 • Flow Instruments • Page 7

Dimensions

Flow Instruments

SIGNAL CONDITIONERS

.89

(22.5)

Mounting holes molded
directly under cover screws.
Max. screw head .29"

4.21

(107)

(Typ. 4 places)

4.21

(107)

4.92

(125)

TOP VIEW

PANEL INSTALLED

Explosion Proof Enclosure

4.9 - 5.25

(124 - 133)

DIN Rail Mount

1.40 (35.5)

2.95 (75)

NEMA4X

To access terminals, remove
cover and 4 panel screws.

4.92

(125)

.43

(11)

3/4” NPT (2) HLS.
(feed thru hubs)

.18 (5)

SIDE VIEW

Optional holes
or hub fitting

3.88 (98.5)

2.95
(75)

1.93
(49)

Terminal Designations
Standard

Termination

1• Magnetic pickup
2• Magnetic pickup
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –
6• Shield (common)
7• Output +
8• Output –
9• Do Not Use

Simplified Block Diagram

mV

Input

3-30V

Input

+
–

10kΩ

10kΩ

3.3kΩ

Typical Application
Magnetic Pickup Input

Raw Signal

Flowmeter

with Magnetic Pickup

Typical Application
Contact Closure Input

Flowmeter

with Contact Closure

SCFI-X-L (low count speed)
Termination

1• Do Not Use
2• Contact Input
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –
6• Shield (common)
7• Output +
8• Output –
9• Do Not Use

Span

F/V

Zero

V ref

1
2

SCFI

Mag Pickup Input

2
3

SCFI-X-L

with Slow Speed

Input Option

V/I

Loop Powered

4-20mA Output

7
8

R

L

7
8

R

L

+

–

+
–

+
–

5.9 - 7.7

(150 - 196)

4.75 -5

(121 - 127)

Example SC-FI D ET
Series

FI= Frequency to Current

Ordering Information

Mounting:

B= Nema 4X
C= Explosion Proof
D= DIN Rail

Options:

ET= Extended Temp: -4° to 185°F (-20° to 85° C)
L = Low Count Speed for Contact Closure Inputs
T = Third 3/4" conduit entry for Explosion Proof Housing
H2 = 0.875" Hole for NEMA4 mounting style
HF2 = 0.5" Female NPT Hub fitting

Optional 3rd
Conduit Entry

All Dimension in inches (mm)

H3 = 1.125" Hole for NEMA4 mounting style
HF3 = 0.75" Female NPT Hub fitting

Accessories: (add to end of part number)

DR-4= 4" DIN Rail

Page 8 • Flow Instruments • F-15 Kessler-Ellis Products • 800-631-2165