Campbell Scientific CS440 Liquid Level Sensor - Manual (Page 7)

CS440 Liquid Level Sensor
3
Although the cable jacket is made from a thick, tough polyurethane formation,
care should be taken to avoid cable damage. Further, sharp bends or excessive
pinching of the cable can cause damage and may pinch off the vent tube
causing measurement errors in the case of gauge pressure (vented) devices.
Do not drop the instrument or allow it to “free fall” down a well as this may
damage the device.
Never attempt to disassemble the transducer as this will void the warranty.
4. Wiring
The measurement of a 4-20 mA signal requires a precision shunt resistor of
either 100 or 125 Ohms. Typical ratings on the resistor are 0.1 percent
tolerance, 10 ppm per deg C, and 1/4 watt. The measurement can be single
ended or differential. If you are using a CURS100, please refer to the
CURS100 manual. If you are using a resister, one side goes to the SE or H
input channel with the blue wire. The other end of the resistor goes to the L
side for a differential measurement or G for ground on a single ended
measurement. The low side of the differential channel is connected to ground
via a jumper wire.
Single Ended
Color
Function
CR200 Series CR10(X), CR510,
CR1000, CR3000,
CR5000
White + Power. 8 to 24 VDC Battery + 12V
Blue Signal SE input SE input
Resister Voltage shunt SE Input SE Input
Resister G G
Clear Shield. Not connected
to transducer body G G
Differential
Color
Function CR10(X), CR510, CR1000,
CR3000, CR5000
White + Power. 8 to 24 VDC 12V
Blue Signal H Input
Resister Voltage shunt H Input
Resister L Input
Jumper Tie Low to Ground L Input
Jumper G
Clear Shield. Not connected
to transducer body G
You must also supply power for the 4-20 mA transmitter. For example, if the
sensor requires a minimum of 9 VDC and you are using the CURS100, you
need to make sure that the supply voltage does not drop below 9 V + (20 mA
amps * 100 Ohms) = 11 VDC.