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Campbell Scientific

March 14, 2017

Specifications

Sensing Volume1: CS650: 7800 cm3

CS655: 3600 cm3 (~7.5 cm radius around

each probe rod and 4.5 cm beyond the end

of the rods)

Ingress Protection Rating:

IP68

Soil Temperature

Measurement Range:

-10° to +70°C

Accuracy2:

±0.5°C for probe body buried in soil

Precision3:

±0.02°C

Electrical Conductivity Measurements

Range:

CS650

CS655

Solution EC

0 to 3 dS/m

0 to 8 dS/m

Bulk EC

0 to 3 dS/m

0 to 8 dS/m

Accuracy2:

±(5% of reading + 0.05 dS/m)

Precision3:

0.5% of BEC

Relative Dielectric Permittivity Measurements

Range:

1 to 81

Accuracy2

CS650

CS655

1 to 40

Range

±(2% of reading + 0.6) for

solution EC ≤3 dS/m

±(3% of reading + 0.8) for

solution EC ≤8 dS/m

40 to 81

Range

±1.4 for solution EC ≤1

dS/m

±2 for solution EC ≤2.8

dS/m

Precision3:

<0.02

Volumetric Water Content Measurements

Range:

5% to 50%

Accuracy2:

CS650:

±3% typical in mineral soils,where

solution EC ≤3 dS/m

CS655:

±3% typical in mineral soils,where

solution EC ≤10 dS/m

Precision3:

<0.05%

1

Approximately 7.5 cm radius around each probe rod and 4.5 cm beyond the end

of the rods.

2

Accuracy specifications are based on laboratory measurements in a

series of solutions with dielectric permittivities ranging from 1 to 81 and

solution electrical conductivities ranging from 0 to 3 dS/m.

3

Precision describes the repeatability of a measurement. It is determined

for the CS650/CS655 by taking repeated measurements in the same

material.

Electrical

Sensor Output:

SDI-12; serial RS-232

Warmup Time:

3 s

Measurement Time: 3 ms to measure; 600 ms to complete SDI-12

command

Power Supply Requirements: 6V DC to 18V DC; must be able

to supply 45 mA @ 12V DC

Current Drain

Active (3 ms): 45 mA typical @ 12V DC (80 mA @ 6V DC, 35 mA

@ 18V DC)

Quiescent:

135 μA @ 12V DC

Average:

I = 0.09n + [3.5 + 0.024(n-1)]n/s

Where,

I = average current in milliamps

n = number of CS650/CS655 probes

s = number of seconds between measurement

Electromagnetic: CE compliant (EMC compliant performance criteria

available upon request). Meets EN61326 requirements for protection

against electrostatic discharge and surge. External RF sources can

affect the probe’s operation. Therefore, the probe should be located

away from significant sources of RF such as ac power lines and motors.

Interprobe Interference: Probes enabled simultaneously and within

~9 in. of each other can cause erratic measurements. If the probes

must be installed within 9 in. of each other, configure the SDI-12

communication such that the probes are not enabled simultaneously.

Physical

Operational Temperature: -10° to + 70°C

Maximum Cable Length:

610 m (2000 ft) combined length

for up to 10 sensors connected to the same datalogger control

port.

Rod Dimensions

Length:

CS650 - 300 mm (11.8 in)

CS655 - 120 mm (4.72 in.)

Diameter:

3.2 mm (0.13 in.)

Spacing:

32 mm (1.3 in.)

Probe Head Dimensions

Height:

85 mm (3.3 in.)

Width:

63 mm (2.5 in.)

Depth:

18 mm (0.7 in.)

Weight

Probe without cable:

CS650 - 280 g (9.9 oz)

CS655 - 240 g (8.46 oz.)

Cable:

35 g per m (0.38 oz. per ft)

The CS650G makes inserting

soil-water sensors easier in

dense or rocky soils. This tool can

be hammered into the soil with

force that might damage the

sensor if the CS650G were not

used. It makes pilot holes into

which the rods of the sensors

can then be inserted. It replaces

both the 14383 and 14384.

CS650G Rod Insertion Guide Tool