OxyGuard 1 Portable

Single channel monitor for dissolved and gaseous oxygen

The OxyGuard 1 system measures dissolved or gaseous oxygen.

Typical uses are:

  • Dissolved oxygen monitoring in sewage treatment plants.
  • Effluent monitoring in industry, land fill sites etc..
  • Monitoring of oxygen levels in clean water, beverages, oil etc..
  • The measurement of the purity of oxygen gas from oxygen generators.
  • Alarm monitor for the contamination of inert or other gas by oxygen.
  • Safety monitor where air could contain too low or too high oxygen levels.

OxyGuard 1 meets all of the usual demands made to such equipment, and has a galvanically isolated analogue output and three relay outputs with individual set points. The system is flexible; the user can change the range setting, choice of alarm function and analogue output type.

OxyGuard 1 comes complete with probe and accessories for several years normal use. The probe - the OxyGuard Standard Probe - is designed to last a lifetime with a minimum of maintenance!

Technical Advantages



Dimensions: Diameter = 58 mm, length = 59 mm. Standard cable length = 5 m.

Weight: 400 g incl. cable.

Principle of Measurement: Galvanic cell, self polarizing, self temperature compensating.

Operating Conditions: 0 to 40°C, and pressure to 10 atm. or more (liquid measurements only).


Construction: ABS/Acrylic enclosure containing front panel with display, set point and calibration adjustments; main circuit board with power supply, terminals, electronics and relays.

Dimensions: 1W: b x h x d: 175 x 235 x 85 mm. 1P: Cut-out 66 x 137 mm., depth 150 mm.

Weight: Approx. 1 kg

Supply: 230/115 VAC or 24 VAC. Please specify when ordering.

Operating Conditions: -10 to +50°C. Enclosure rated IP65.

Output: 0/4-20 mA. Max. load 750 ohm. Fully galvanically isolated from the input

Range: ppm: 0-5.0, 0-10.0, 0-20.0 and 0-100.0 ppm. (mg/l). % sat:, 0-50.0, 0-100, 0-200 and 0-1000 % sat, % volume: 0-25.0, 0-50.0 and 0-100% volume,

Accuracy/Repeatability: Accuracy depends on method of calibration and reference method. Repeatability is typically better than +/- 0.5% of measured value.

Relay Outputs: 2 alarm output relays, marked "HI" and "LO", with potential free changeover contacts. The relays are normally energized for fail safe operation.

One CON output - potential free changeover contact.

Ordering Information

OxyGuard 1W: B011W OxyGuard 1P: B011P

OxyGuard 1W for ambient air monitoring (with AirAlarm): B011WR

OxyGuard 1W for gas purity (with gas flow cell): B011WG

Portable version of OxyGuard 1W: B011T

The equipment is delivered ready for use