Liquid Controls SP712-2 REV. C - Manual (Page 2)

Sponsler, Inc. SP712-2 Transmitter pg 2 DOC#: MN-712-C
SPECIFICATIONS
Temperature: Operating -40 to 85
°C
Storage -65 to 125
°C
Input Voltage: Minimum = 7 V + (20mA X RL)
Maximum = 28 V + (4mA X RL)
Protected against polarity reversal
Signal Input: Frequency 0-10 KHz
Amplitude 50 mV – 35 V sine or square wave
Sensitivity field adjustable
Impedance 50K
Analog Output 4mA @ 0 Hz, 20mA @ desired full scale frequency
Full scale range -- 100 Hz-10 KHz selectable
Response time -- 95% of change in 1 second
Linearity -- .3% F/S
Tempco -- < 2% of reading over entire temperature range
Features: 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 SP712-2 is a 2-wire loop powered analog transmitter designed to linearly convert a
frequency input to an equivalent 4-20mA current output. When it incorporates 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
transmission.
A full-scale frequency range of 100 Hz-10 KHz is selectable, via S1. The span adjustment
establishes the frequency point at which a 20mA output is achieved. The sensitivity adjustment
permits the SP712-2 to discriminate between a signal input and noise by increasing (CCW) or
decreasing (CW) the input signal amplitude necessary to process a valid signal. ‘Test’ S2 when
depressed, illuminates D1 if loop voltage and input signal both are present.
Installation of the SP712-2 requires only 2 wires because it is a true 2-wire transmitter: input
power and signal output utilizes the same wires.