Campbell KPSI Series Manual de usuario

USING THE CS400/CS405 (KPSI SERIES 169/173)

SUBMERSIBLE PRESSURE TRANSDUCER WITH

CAMPBELL SCIENTIFIC DATALOGGERS

INSTRUCTION MANUAL

REVISION: 11/02

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The CS400/405-L are manufactured by KPSI. KPSI’s conditions of sale and return policy

apply to these items.

Products may not be returned without prior authorization. To obtain an RMA number

contact KPSI, phone (800) 328-3665. NOTE: if the product has been exposed to

hazardous media, it must be fully decontaminated and neutralized prior to return to KPSI.

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CS400/CS405 Table of Contents

1. General Information....................................................1

2. Specifications .............................................................1

3. Installation...................................................................2

3.1 Vent Tubes................................................................................................2

3.2 Dislodging Bubbles...................................................................................2

3.3 Transient Protection..................................................................................3

3.4 Temperature Fluctuations .........................................................................3

3.5 Sensor Connections...................................................................................3

3.6 BDR320....................................................................................................3

3.7 BDR301....................................................................................................3

3.8 PST3/8......................................................................................................4

4. Programming ..............................................................4

4.1 Using Short Cut.........................................................................................5

4.2 Using Edlog or the Keyboard/Display......................................................5

4.3 CR10(X), CR510, and CR500 Programming............................................7

4.4 CR23X and 21X Programming.................................................................8

4.5 BDR301/320 Programming ......................................................................9

4.6 PST3/8 Programming..............................................................................10

5. Maintenance..............................................................10

5.1 Every Visit, At Least Monthly................................................................10

5.2 Every Three Months ...............................................................................11

5.3 Every Two to Three Years or on a Rotating Schedule............................11

6. Troubleshooting........................................................11

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Using the CS400/CS405 (KPSI Series

169/173) Submersible Pressure

Transducer with Campbell Scientific

Dataloggers

1. General Information

The CS400/CS405 (KPSI-PSI Series 169/173) submersible pressure transducer

measures water levels in environmental and industrial applications. As the

water depth changes over the transducer, so does the pressure. The

CS400/CS405 contains a strain gauge element which senses the pressure and

produces a corresponding mV analog output when an excitation current is

provided. The datalogger measures the signal differentially and scales it to the

excitation current. This current is detected by the datalogger by measuring the

voltage drop across a 100-Ohm precision resistor such as Campbell Scientific’s

part #7977 in series with the black excitation wire. CS400/CS405 transducers

are vented so that changes in barometric pressure are compensated for in the

measurement.

The difference between the CS400 and CS405 is specified accuracy. The

CS400 has an accuracy of 0.25% of the full scale output. The CS405 has an

accuracy of 0.1% of the full scale output.

2. Specifications

Static Accuracy* ±0.25% FSO BFSL (CS400-L)

±0.1% FSO BFSL (CS405-L)

Thermal Error** 0.022% FSO/°C worst case

Proof Pressure 1.5 X rated pressure

Burst Pressure 2.0 X rated pressure

Resolution Infinitesimal

*Static accuracy includes the combined errors due to nonlinearity, hysteresis

and nonrepeatability on a Best Fit Straight Line (BFSL) basis, at 25°C.

**Thermal error is the maximum allowable deviation from the Best Fit Straight

Line due to a change in temperature.

Comp. temp. range 0°C to 27°C

Operating temp. range -10°C to 70°C

Excitation 0.5 mA constant current

Zero offset, max 10 mV

Bridge impedance 3500 ohms nominal

Insulation resistance 100 megohms at 50 VDC

Using the CS400/CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers

Output Voltage (mV)

at 0.5 mA constant PSI range

30 5

35 10

50 15-20

63 25

75 30

65 50

3. Installation

The CS400/CS405 should be limited to an 800' cable length. Also, remember

to properly ground the datalogger to reduce the chances of damage from

lightning and reduce radio frequency and other types of electromagnetic noise.

If Campbell Scientific’s Short Cut computer program suits your

datalogging needs, you should run Short Cut to generate the

datalogger program and wiring assignments instead of stepping

through the remainder of this document. Please refer to the

Factory Calibration below for the multiplier you will need.

3.1 Vent Tubes

A vent tube incorporated in the cable vents the sensor diaphragm to the

atmosphere. This eliminates the need to compensate the water level

measurement for changes in barometric pressure.

To prevent water vapor from entering the inner cavity of the sensor, the

transducers are typically shipped with the vent tubes sealed. Before operation,

visually confirm the vent tube is open. The vent tube opening must terminate

inside a desiccated enclosure or a Campbell Scientific DES2 desiccant case.

The desiccant must be changed regularly.

3.2 Dislodging Bubbles

While submersing the sensor, air bubbles may become trapped between the

pressure plate and the water surface, causing small offset errors until the

bubbles dissolve. Dislodge these bubbles by gently shaking the pressure

transducer while it’s under water.

Do not hit the sensor against the well casing or other solid

surface while dislodging the bubbles, because the

diaphragm could be damaged.

NOTE

CAUTION

Using the CS400/CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers

3.3 Transient Protection

Campbell Scientific recommends transient surge protection for sensors installed

in lightning prone areas. No lightning protection is capable of withstanding a

direct hit, but surge protectors afford a degree of protection for near misses.

Surge protection can be provided by Campbell Scientific’s SVP48 Surge

Voltage Protector. When an electrical surge occurs, the surge protectors

involved may need to be replaced.

3.4 Temperature Fluctuations

Temperature fluctuations can be minimized by using a minimum cable burial

depth of six inches and a sensor submersion depth of one foot.

3.5 Sensor Connections

Datalogger #7977 Resistor

E1 -----------------------------Purple

CS400/CS405 1H -----------------------------Yellow

Black ------------------- 1L -----------------------------Black

Red---------------------- 2H

Green ------------------- 2L

White ------------------- AG

Blue --------------------- G/ground

3.6 BDR320

BDR320 #7977 Resistor

EX-----------------------------Purple

CS400/CS405 --------------- CH1 ---------------------------Yellow

Black ------------------- CH2 ---------------------------Black

Red---------------------- CH3

Green ------------------- CH4

White ------------------- AG

Blue --------------------- G/ground

3.7 BDR301

The CS400/CS405 can be connected to the BDR301 by using a DES-2

Desiccant Box and replacing the DES-2's standard five-lead cable with a six-

lead cable terminated with a ten-pin military connector. Figure 3-1 shows the

DES-2 wiring format with placement of a #7977 resistor.

Using the CS400/CS405 Submersible Pressure Transducer with Campbell Scientific Dataloggers

FIGURE 3-1. Wiring diagram for a CS400/CS405 and a DES-2

connected to a BDR301.

3.8 PST3/8

The PST3/8 has a #7977 built-in. Figure 3-2 shows the wiring for a

CS400/CS405 and a DES-1 which can be connected to the PST3/8.

FIGURE 3-2. Wiring diagram for a CS400/CS405 and a DES-1 for use

with the PST3/8.

4. Programming

The example programs below enable the datalogger to collect and process data

and store it in input storage locations.

Additional instructions are needed to output data to final storage.

For example, time periodic output might include instructions

P92, P77, P70, etc.

NOTE

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