Campbell Scientific CS510 User Manual

INSTRUCTION MANUAL

CS510 Oxyguard

Dissolved Oxygen Probe

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Copyright (c) 2000

Campbell Scientific, Inc.

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 [phone]. NOTE: if the product has been
exposed to hazardous media, it must be fully decontaminated and neutralized prior to
return to Point Four Systems.

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 t o th e amount of oxygen present in th e measured medium.
Oxygen diffuses through the membrane onto the cathode, reacts chemically, and
combines with th e an ode. An electrical current is produced by th is ch emical
reaction which is converted from microam ps to m illivolts by an in- lin e resistor.
An in-line thermistor also conditions the signal providing autom atic temperature
compensation. With these features, the probe produces a millivolt output
proportional to the oxygen presen t in th e medium in w h ich it is placed. The probe
consists of two parts, an upper part w i th cat h ode, an ode an d cabl e, an d a l ower
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 n o ex tern al power source. There are only
two wires to connect. Cable length is rarely a limiting factor and generally there is
no need for shielded wi re.

Because the probe's output is lin ear, it is pos s ible to con n ect it directly to a data
acquisition system capable of handling the sm all 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 th e f actory
for servicing. It utilizes a strong, easy-to-clean and easy-to-change membrane in a
screw-on membrane cap. Regular serv icin g is n ot requ ired. When n eces s ary probe
can be fully overhauled in five minutes.

FIGURE 1-1. CS510-L

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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 ½ in)
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 f rom 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 Na

2CO3

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