Campbell Oxyguard CS510 Manual de usuario

CS510 OXYGUARD DISSOLVED OXYGEN PROBE

INSTRUCTION MANUAL

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The CS510-L Oxyguard Dissolved Oxygen Probe is manufactured by Point Four Systems

Incorporated. Point Four’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 Point Four Systems, Inc., phone (604) 936-9936. NOTE: if the product has been

exposed to hazardous media, it must be fully decontaminated and neutralized prior to

return to Point Four Systems.

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CS510 OxyGuard Dissolved

Oxygen Probe

An accurate and reliable sensor is a critical element in any measurement system. The

OxyGuard Stationary Probe meets these criteria for the measurement of dissolved oxygen.

1. General Information

The OxyGuard Stationary Probe is a galvanic probe which produces a millivolt

signal proportional to the amount of oxygen present in the measured medium.

Oxygen diffuses through the membrane onto the cathode, reacts chemically, and

combines with the anode. An electrical current is produced by this chemical

reaction which is converted from microamps to millivolts by an in-line resistor.

An in-line thermistor also conditions the signal providing automatic temperature

compensation. With these features, the probe produces a millivolt output

proportional to the oxygen present in the medium in which it is placed. The probe

consists of two parts, an upper part with cathode, anode and cable, and a lower

part comprising a screw on membrane cap with fitted membrane. The cap is filled

with electrolyte and simply screwed onto the top component.

The probe is self polarizing and requires no external power source. There are

only two wires to connect. Cable length is rarely a limiting factor and generally

there is no need for shielded wire.

Because the probe's output is linear, it is possible to connect it directly to a data

acquisition system capable of handling the small millivolt signal.

The probe's robust construction and simple design make maintenance and

servicing it straightforward. There is no need to send the probe back to the

factory for servicing. It utilizes a strong, easy-to-clean and easy-to-change

membrane in a screw-on membrane cap. Regular servicing is not required. When

necessary probe can be fully overhauled in five minutes.

FIGURE 1-1. CS510-L

CS510 OxyGuard Dissolved Oxygen Probe

2. Specifications

Principle of Measurement: Membrane covered polarographic oxygen probe—

self polarizing galvanic cell

Output Signal: 5 mV per mg/l, 2 mV per %/vol nominal

Accuracy: Better than +/- 2 % of reading +/- 1 digit when calibration

temperature equals measuring temperature +/- 5 C

Repeatability: Better than +/- 0.2 mg/l; Better than +/- 0.5 %/vol when

barometric pressure unchanged

Output Impedance: 1 kOhm nominal

Response Time:

mg/l: 60 s for 90 % of 100 % step change at constant temperature

%vol: 10 s for 90 % of 100 % step change at constant temperature

Materials of Construction:

Probe body: POM (polyoxymethylene)

O-rings: Viton

Membrane: 0.05 mm (2 mil) Teflon

Dimensions and Weight:

58 mm diameter by 59 mm high (2-1/4 inch diameter by 2-1/4 inch high)

350 g (3/4 lb) including standard 3 m (10 ft) cable length

Cable: 2-conductor, 0.75 square mm (16 gauge), standard length 3 m (10 ft);

other lengths available upon request

Operating Conditions: Temperature: 0 to 50 C (32 to 122 F)

Pressure: Maximum 10 atmospheres (147 psig)

Minimum Submersion Depth: 60 mm (2 ½in)

Minimum Water Flow: 2.5 cm/s (1 in/sec) across membrane

Calibration: In air or in air saturated water. Use of EasyCal calibrator optional.

Temperature Compensation: Automatic from 4 - 40 C (40 - 104 F)

Probe Options: Type I Type II

Range of dissolved

oxygen 0-50 mg/l, 0-500 % Sat 0-15 mg/l, 0-150 % Sat

Gaseous oxygen 0-100 %/vol 0-35 %/vol

Electrode materials Ag cathode/Zn anode Ag cathode/Pb anode

Probe electrolyte NaCl Na2CO3

CS510 OxyGuard Dissolved Oxygen Probe

3. Service Kit

Spare membrane cap with fitted membrane.

50 ml electrolyte.

Spare anode and O-ring.

FIGURE 3-1. Exploded View of CS510-L

4. Optional Probe Accessories

Agitator for stagnant conditions.

Probe Mounting assembly for waste water installations.

Flow-through and by-pass fittings.

EasyCal calibrator for fast and accurate calibration.

5. Optional Agitator

The PT4 Agitator is a reliable and robust agitator for use in conjunction with

probes subjected to bio-fouling in ponds and stagnant water conditions.

O2probes require a minimum water velocity across their membranes to function

properly. Therefore, to measure DO in stagnant water conditions, it is necessary

to move the water past the membrane to get accurate and reliable DO

measurements. In many instances the water also has a high bio-loading and the

probes become fouled resulting in inaccurate DO measurements.

CS510 OxyGuard Dissolved Oxygen Probe

FIGURE 5-1. Preventing Bio-fouling of the CS510-L

The PT4 Agitator overcomes these problems. The device is designed so that a

soft bristle brush sweeps across the probe membrane or sensor tip. This sweeping

action of the brush provides the required water velocity as well as prevents the

membrane from becoming bio-fouled.

The optimum sweeping frequency depends upon the design of probe and type of

membrane used and water conditions. An ON-time of 0.25 seconds and OFF-

time of 5 seconds is suitable in most circumstances.

Agitator’s overall size: 7-1/8" x 3-1/4" diameter, 1-1/4 lb. (180mm x 83mm, 0.6 kg)

Supplied with 10 ft. (3 meters) cable.

Power required: 10.5 to 18 VDC at the agitator, 1.1 amps. Maximum ON-time is

3 seconds.

FIGURE 5-2. CS510-L with PT4 Agitator

CS510 OxyGuard Dissolved Oxygen Probe

Optional Repeat Cycle Timer for Agitators: Reciprocating action may be

controlled by the optional solid state Repeat Cycle Timer. It sends 12 VDC pulses

to the agitator coil. The ON-time is 0.25 sec. The OFF-time is adjustable from 3

to 12 sec.; requires supply voltage 10 to 17 VDC; housed in watertight cylinder

6.6" x 2" diameter (170 mm X 50 mm).

6. Application Information

Short Cut users: This application note was written primarily for

those whose needs are not met by Short Cut. Your procedure is

much simpler: just add the OxyGuard probe (it’s in the water

quality sensor group), save your program, and follow the wiring

shown in Step 4 of Short Cut.

7. Wiring

The OxyGuard probe uses one differential channel. Differential wiring is better

at rejecting electrical noise and ground loop error.

Red -----------------1H

Blue-----------------1L

8. Programming

Instruction 2, differential millivolt measurement is required for the OxyGuard

probe. The example measurement instructions that follow do not store data to

final storage. Additional instructions (Typically P92, P77 and output processing

instructions such as P70) are required to store data permanently.

*1 Table 1

01: 15 Sec. Execution Interval

01: Volt (Diff) (P2)

01: 1 Rep

02: 24 250 mV

03: 1 Diff Chan

04: 1 Loc: [DO ]

05: 1 Mult. *See calibration*

06: 0 Offset

9. Calibration

The multiplier is used to calibrate the OxyGuard probe. To calculate the

multiplier:

1) Program the CR10(X) using a multiplier of one.

2) Place the OxyGuard probe in the air, shaded from the sun. Wait for readings

to stabilize. This may take 15 minutes or more.

NOTE

CS510 OxyGuard Dissolved Oxygen Probe

3) Determine the air temperature and barometric pressure.

4) Using a calibration chart such as that provided in the probe’s manual,

determine the oxygen concentration of the air.

5) Use the following equation to calculate the multiplier:

M = P/R

M = Multiplier

P = Concentration in PPM of the air (from the calibration chart)

R = The signal output of the OxyGuard probe when using a multiplier of one

6) Change the multiplier in the CR10 program from one to the calculated

number.

10. Maintenance

The OxyGuard probe needs little maintenance. Regular cleaning of the

membrane is all that is required. The membrane is very durable and can be

cleaned with a cloth or soft paper. Do not scratch it clean with your fingernail.

Please see the OxyGuard manual for complete maintenance procedures.

11. Agitator Control

In low flow conditions (less than about 2 cm/sec), it may be necessary to add

an agitator to the OxyGuard probe. The distributor for OxyGuard in North

America sells a self-timed agitator which can be purchased through Campbell

Scientific. The self-timed agitator requires no datalogger programming.

However, some users choose to use a solid state relay and have the datalogger

agitate the water on the probe face either periodically throughout the day or

just before measurement. Agitating just before the measurement saves on

power and causes less wear and tear on the agitator and probe membrane.

The wiring for the agitator as controlled by this example program would be as

follows:

WHITE

BLACK

Agitator

+ -

12 V Battery

4 1

#7321 Relay

Crydom D1D07

3 2

Ground/

Datalogger

Port C1

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