Liquid Controls SP3000 - 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