INSTALLATION & OPERATION
MANUAL
SP718-mA REV. A
Modulated Carrier Amplifier
4-20mA Transmitter
DOC#: MN-718MA-A.doc
Sponsler, Inc.
SP718-mA Modulated Carrier Amplifier
pg
2
DOC# MN-718MA-A
LED Power Indicator
Weight 1. 7 lbs.
Temperature:
SPECIFICATIONS
Operating 0 – 70oC
Storage –20 – 85oC
Input Voltage:
Signal Input:
Analog Output:
Features:
Enclosure:
110VAC 60Hz or 12 – 16.5VDC 100mA MAX
Observe Polarity
Consult factory for other I nput Voltages
Frequency 0 – 3500 Hz w/ 50kHz carrier (requires P/U Coil 1 – 1.3
mh)
4mA @ 0Hz, 20 mA @ desired Full Scale Frequency
Full Scale Range 25Hz – 3500 Hz Selectable
Consult factory for other Rang es
Response Time 95% of change in 1 second
Linearity .3% F/S
Tempco <2% of Reading over entire Temperature Range
Maximum Load Resistance 500 ohms
Mounts directly on flowmeter
FM Approved, CSA Certified
Class I Groups B, C, D
Class II Groups E, F, G
The SP718-mA Modulated Carrier Amplifier and Analog Transm it t er is a meter mounted device designed to
combine the advantages of the Modulated Carrier pr inciple with the convenience of an analog output in a
single PCB assembly. The SP718-mA linearly converts the detected carrier frequency shift rate t o an
equivalent 4-20mA current output. When incorporated with a turbine flowmeter a current representation
proportional to flow is obtainable. Data transmission in a curr ent format exhibits excellent noise immunity
and the capability of long distance transmissions.
The SP718-mA produces a carrier frequency in conjunction with an RF pickup coil, detects the shift in the
carrier frequency (Modulation) that occur s with the passage of magnetic mater ial and linearly generat es a
4-20mA output that is proportional to the rate of modulation.
A full-scale freq uency range of 25-3500Hz is jumper selectable. The Span Adj ustment establishes the
frequency point at which a 20mA output is achieved.
The Modulated Carrier principle introduces no drag on the passing magnetic device; therefore, when
utilized with a turbine flowmeter extension of the flowmeter’s nominal linear rang e at the low end of the flow
spectrum is realized. This parameter is particularly useful when measuring a low mass gas and the
operating flowrate is at the f lowmeter ’s low end.
Sponsler, Inc.
SP718-mA Modulated Carrier Amplifier
pg
3
DOC# MN-718MA-A
NOTE:
All test equipment power cords should be equipped with 2-prong ‘cheat er ’ plug s.
A)
Connect Flowmeter with RF Pick-up Coil to J1-1,2
Connect Power Supply Positive (HOT) & Negative (NEU) Leads to J1-6,5
Respectively
C)
D)
Connect DMM Positive & Negative Leads to J1-3,4 Respectively, Set Function to mA
DC
E)
Install Jumper @ JU1-3 for desired Full Scale Freq uency Range
6Vp-p Carrier Sinewave
G)
Adjust ‘ZERO’ (R25) for a DMM Indication of 4.00mA
H)
Set Frequency Generator f unction to Sinewave, Amplitude to 500mVp-p with 2.5VDC
Generator POSITIVE Lead to TP1 (R11) & NEGATIVE Lead to J1-2.
I)
Adjust ‘SPAN’ (R23) for DMM Indication of 20.00mA
DMM Indication of 4.00mA if necessary
K)
Increase Signal Amplitude of Frequency Gener ator to 500mVp-p, 2.5VDC OFFSET;
Adjust ‘SPAN’ (R23) for DMM Indication of 20.00mA if necessary
Adjust Frequency of Frequency Gener ator to 0, 25, 50, 75, & 100% of Full Scale
Frequency of Step H
To check for Linearity at any Freq uency Point, incor por at e t he following formula -
Example: Assume Maximum Frequency Point = 2KHz (20mA Point)
Check for Linearity at 750Hz
750/2000 = .375
16 X .375 = 6
6 + 4 = 10 DMM Should indicate 10.00mA at 750Hz
J1-3
J1-4
-
+
SP718-mA
BENCH TEST CALIBRATION PROCEDURE
Required Equipment: Power Supply 12-16.5VDC or 110VAC
Digital Multimeter ( DMM)
Frequency Generator
Frequency Counter
Oscilloscope
Refer to Figure
Test Procedure:
B)
R LOAD
R SENSE
Connect O’Scope Positive & Negative Leads to J1-1,2 Respectively
Turn Power Supply ‘ON’, LED D1 Illuminates & O’Scope displays a 50KHz +/- 5KHz
F)
OFFSET & Frequency to desired Full Scale Frequency. Connect Freq uency
Reduce Signal Amplitude of Frequency Generator to Zero, Adjust ‘ZERO’ (R25) for
J)
L)
(F/F Max X 16) + 4 = mA
Sponsler, Inc.
SP718-mA Modulated Carrier Amplifier
pg
4
DOC# MN-718MA-A
3.00 DIA.
2.40 DP.
3.75 DIA.
5.60
1.40
5-5-97
TN
EM SP718-mA
SP718-mA Rev. A
\ELECT\SP718mA.DWG
NONE
DRAWING NUMBER
MATERIAL
SPONSLER, INC.
SCALE
DRAWN BY
DATE
APPR. BY
DATE
REVIEWED BY
DATE
DESCRIPTION
REV. #
FILE NAME
COD
REVCKDR
AUTH
REVISION RECORD
DATE
SIGNAL IN +
SIGNAL IN –
ANALOG OUT +
ANALOG OUT –
110 VAC NEU (DC-)
110 VAC HOT (DC+)
1
2
3
4
5
6
TERMINAL LOCATION
NOTE: DIMIENSIO NS ARE IN INCHES
.90
3/4-14 FNPT
NOTE:
Condulet enclosure not
available for 120 volts,
consult factory
F/S Frequency Select
JU1 25-140 Hz
JU2 125-700 Hz
JU3 675-3500 Hz
TP1
©2009
Pub. No. MN-718MA-A
(09/09)
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