Liquid Controls SP718-MA-24-C - Manual (Page 2)

Sponsler, Inc. SP718-mA Modulated Carrier Amplifier pg 2 DOC# MN-718MA-24
Temperature: Operating 0 – 70
o
C
Storage –20 – 85
o
C
Input Voltage: 12 – 24VDC 100mA MAX
Reverse Polarity Protected
Consult factory for other Input Voltages
Signal Input: Frequency 0 – 3500 Hz w/ 50kHz carrier (requires P/U Coil 1 – 1.3
mh)
Analog Output: 4mA @ 0Hz, 20 mA @ desired Full Scale Frequency
Full Scale Range 25Hz – 3500 Hz Selectable
Consult factory for other Ranges
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
Features: LED Power Indicator
Mounts directly on flowmeter
Enclosure: FM Approved, CSA Certified
Class I Groups B, C, D
Class II Groups E, F, G
Weight 1.7 lbs.
The SP718-mA Modulated Carrier Amplifier and Analog Transmitter is a meter mounted device designed to
combine the advantages of the Modulated Carrier principle with the convenience of an analog output in a
single PCB assembly. The SP718-mA linearly converts the detected carrier frequency shift rate to an
equivalent 4-20mA current output. When incorporated with a turbine flowmeter a current representation
proportional to flow is obtainable. Data transmission in a current 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 occurs with the passage of magnetic material and linearly generates a
4-20mA output that is proportional to the rate of modulation.
A full-scale frequency range of 25-3500Hz is jumper selectable. The Span Adjustment 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 range 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 flowmeter’s low end.