Liquid Controls SP718-mA User Manual

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.