The OxyGuard CO2 Portable is a reliable and easy to use instrument that measures the free dissolved carbon dioxide concentration directly in the water. The CO2 concentration is shown on the display, and there is an analogue output. A version with built-in data logger is available.

The OxyGuard CO2 measures the free dissolved CO2 directly and is not affected by carbonates or other dissolved substances. It is the free dissolved CO2 – in other words the CO2 gas partial pressure – that affects the fish. The OxyGuard CO2 thus gives simple, continuous and direct measurements of the amount of carbon dioxide in the water that will affect the fish.

The analyser is easy to calibrate using the front panel “slope” and “zero” adjustments – after which you just put the probe in the water and measure. There is a salinity adjustment. Calibration intervals are long, and the OxyGuard CO2 does NOT need regular maintenance.

• Size: Probe: 40mm dia. x 140 mm. Cable length 3m. Meter 300 x 215 x 83 mm (overall, with carrying handle) Calibration beaker 65mm dia. x 260 mm
• Weight: Approx. 6 kg including charger, calibration fluid, calibration conditioner, calibration beaker and dosing syringe.
• Supply (to charger) Range: 230VAC (115VAC on request). 0-50 mg/1 dissolved carbon dioxide. Temperature compensated range 3-35°C.
• Output: Analogue signal 0-1VDC
• Operating conditions: Electronics -10 to +60°C, splash proof.
• Accuracy: Depends on calibration. Practical accuracy up to -+-/- 1 mg/1.
• Response time: Typically 5 minutes at 20°C depending on flow velocity past probe. In still water up to 15 minutes.
• Flow requirements: The instrument does not use carbon dioxide for its measurement, but a certain flow is necessary to ensure that the sensing element oflhe probe is in equilibrium with the surrounding water, and to avoid "spot" measurements.
• Operating time: Approximately 50 hours on folly charged batteries.
• Delivery comprises: Transmitter & probe with 3m cable, charger, analogue output lead, calibration beaker with stirrer & magnet, 75 g calibration conditioner, 100 ml calibration solution, dosing syringe, measure, screwdriver.

• Warranty: 12 months