KEP SC-FF Data sheet

SC-FF Series

Features:

• Pulse Scaler with Isolation

• Pulse, Contact Closure or Magnetic Pickup
Inputs

• Two Year Warranty

• Various Mounting Styles

• Output LED Indicator

Frequency to Frequency
Pulse Isolator and Scaler

SIGNAL CONDITIONERS

Flow Instruments

Description:

The model SC-FF is a signal conditioner which permits the user
to condition and scale the input pulses from a pulse producing
sensor into a high level output where each pulse represents an
engineering unit of measure.

Several pulse input types are supported including magnetic
pickup, contact closure, and an isolated pulse input.

The pulse scaling permits a user to apply a scaling multiplier with
a value of .0001 to .9999 with additional multipliers of 1, .1, .01,
.001 and .0001. Pulse scaling is accomplished by rotary en­coded and dip switch selections.

The pulse output is available in isolated, non-isolated and relay
versions. User selections include output pulse duration and in­ternal pullup resistors. The user may select his pulse output
configuration by means of a dip switch.

The unit is powered to 8 - 35 VDC. Reverse polarity protection is
provided. Power and Pulse input/output indicators are provided.

The unit is available in enclosures intended for either DIN rail,
NEMA4X or Explosion Proof.

Specifications:
Pulse Input:

Isolated Pulse:

Logic 1 (high): 3 - 30 VDC
Logic 0 (low): 0-0.4 VDC
Input Frequency Range: 0-10000 Hz
Input Impedance: 3.3 kΩ
Reverse Polarity Protection
Isolation Voltage: 500 V

Contact Closure:

Switch Debounce: 40 CPS maximum count rate
10000 ohm internal pullup to 5 VDC

Magnetic Pickup:

Sensitivity: 30 mV p-p
Bandwidth: 0-3500 Hz
Over Voltage Protection to 30 VDC
10 Kohm input resistance

Pulse Output:

Pulse Duration: 50 uSec, 500 uSec 50 mSec (Switch selectable)
Open Collector Pulse:

Maximum Voltage: 48 VDC
Maximum Current: 100 mA @ .7V max
Max. Output Speed: 10 kHz
Reverse Polarity Protection
Overcurrent Protection
Jumper selectable for 5 V and 24 V pulse output

Isolated Pulse:

Maximum Voltage: 30 VDC
Maximum Current: 10 mA
Max. Output Speed: 1 kHz
Isolation Voltage: 500 VDC
Reverse Polarity Protected

Output Relay (optional):

Contact Rating: 0.5 amps 240 VAC
Output Form: Form A (SPST)
Max. Output Speed: 10 Khz

Power Input:

Input Voltage Range: 8.5 to 35 VDC
Supply Current: 25 mA (nominal)
Reverse Polarity Protection
Transient Protection

Pulse Scaling:

Scaler: 0.0001 to .9999
Multiplier: X1, X0.1, X0.01, X0.001, X0.0001

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 13

Dimensions

Flow Instruments

SIGNAL CONDITIONERS

.89

(22.5)

DIN Rail Mount

1.40 (35.5)

2.95 (75)

Simplified Block Diagram

1

mV

Input

2

10kΩ

3.3kΩ

+

5

3-30V

Input

–

6

3.88 (98.5)

Contact
Closure

DC

Input

3

4

+

7

–

8

+
–

10kΩ

Divider

LPF

+5V

5 V

Regulator

Select

Switch

Thumbwheel

.0000 to .9999

Pulse Duration

Monostable

500 µsec

Duration Select

Switch

Pulse Rate
Multiplier

Pulse Rate

Divider

1, 10, 100,

1000,10000

50 µsec

50 msec

Mounting holes molded
directly under cover screws.
Max. screw head .29"
(Typ. 4 places)

4.21

(107)

PANEL INSTALLED

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)

4.9 - 5.25

(124 - 133)

5.9 - 7.7

(150 - 196)

4.75 -5

(121 - 127)

All Dimension in inches (mm)

.18 (5)

SIDE VIEW

Optional 3rd
Conduit Entry

Optional holes
or hub fitting

2.95
(75)

1.93
(49)

+

9

Pulse

Output

–

10

+

Output

Relay

Output

(optional)

11

–

12

11

12

Isolated Pulse

Wiring:

Common
Opto-isolator In (+)
Opto-isolator In (-)

Common

Isolated Pulse Out (+) / Relay Output

Isolated Pulse Out(-) / Relay Output

Typical Application:

Raw Signal

Flowmeter

with Magnetic Pickup

1 2 3

4 5 6

10 11 12

Magnetic pickup
Magnetic pickup
Contact Closure Input

7 8 9

(+) DC Power Input
DC Power Input Common

Pulse Output (+)

7

1

9

2

10

8

SC-FF

Mag Pickup Input

Pulse Output

LED Indicator

Scaled
Pulse
Output

Ordering Information

Example SC-FF 1 B ET
Series

FF= Frequency to Frequency

Output Type

1 = Open Collector & Isolated Pulse (STD)
2 = Open Collector & Relay Output

Mounting:

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

Options:

ET= Extended Temp: -4° to 185°F (-20° to 85° C)
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
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 14 • Flow Instruments • F-15 Kessler-Ellis Products • 800-631-2165