Liquid Controls SP3000 User Manual
Page 7
7
1.52
RTD TEMPERATURE INPUTS
Compatible RTD type:
100 ohms Platinum
(a=0.00385; DIN 43-760 Calibration)
Configuration:
2, 3, or 4 wire
Excitation Current:
2mA typical
Max Fault Current:
15mA
Max Voltage on Sense Inputs:
50 VDC
Rejection of 50-60Hz signal:
40 dB (minimum)
(Automatically based on line frequency)
Raw Accuracy:
0.2% FS RTI
Temperature Range:
-323.5
o
to +1378.7
o
F
(-197.5
o
to +748.1
o
C)
Typical RTD Schematic:
~
2.2 VDC @ 2mA
A/D
1.5 F
1.5 F
20K
20K
100K
1
2
3
4
1.53
DIGITAL FLOW INPUT
Range:
3-30 VDC Pulse
Type:
Dry contact, opto-isolated or
voltage source
Max Input Frequency:
40kHz
Min. Pulse Width:
10
µsec (with 40kHz filter)
Thresholds:
OFF is less than 2.0V/ ON is
greater than 2.5V
Input Impedance:
Less than 30K ohms to ground
Excitation Voltage:
5VDC through 5.6K ohms resistor
Min. Frequency to maintain rate display: 1 Hz
Note: Totalizer counts all pulses down to 0 Hz
Typical Digital Pulse Input & Schematic:
1.5 F
5 VDC
@ 0.9 mA
5.6 K
39 K
100 K
+5 VDC
+5 VDC
16
17
18
COUNTER