Sensor heads, replaceable sensor cartridges and accessories for the HORIBA LAQUA WQ-300 Series smart handheld meters (WQ-310, WQ-320 and WQ-330). Select the item you need from the dropdown.

The WQ-300 platform separates the sensor into two parts. The sensor head carries the cable and connector and plugs into the meter. The cartridge screws into the head and contains the actual sensing element. When a pH or ion sensor reaches end of life you replace only the cartridge — the head, cable and connector stay in service. That is the main running-cost advantage of the WQ-300 series over conventional one-piece electrodes.

Sensor heads

Available in 2 m and 5 m cable lengths. Choose 5 m where you need to reach into a tank, a well or across a treatment basin without moving the meter.

• 300-PH-2 / 300-PH-5 — pH sensor head. Takes the 300-P-C cartridge.
• 300-C-2 / 300-C-5 — conductivity sensor head. Takes the 300-4C-C or 300-2C-C cartridge.
• 300-D-2 / 300-D-5 — optical dissolved oxygen sensor head. Self-contained; consumable is the 300-D-M sensor tip.
• 300-I-2 / 300-I-5 — ion sensor head. Takes any of the five ISE cartridges.
• 300-O-2 / 300-O-5 — ORP sensor head. Takes the 300-O-C cartridge.

Cartridges

• 300-P-C — pH cartridge
• 300-4C-C — conductivity cartridge, 4 cells. The general-purpose choice, covering a wide conductivity span.
• 300-2C-C — conductivity cartridge, 2 cells. For low-conductivity and ultrapure water work.
• 300-O-C — ORP cartridge
• 300-NH4-C — ammonium ion cartridge
• 300-NO3-C — nitrate ion cartridge
• 300-K-C — potassium ion cartridge
• 300-CA-C — calcium ion cartridge
• 300-NA-C — sodium ion cartridge
• 300-D-M — replacement sensor tip for the optical dissolved oxygen head

Accessories

• 300 BNC — BNC adapter, lets you connect a conventional BNC ion-selective or pH electrode to a WQ-300 meter
• 560-PH — pH calibration solution set, pH 4.01, 7.00 and 10.01, 60 mL each
• 560-C — conductivity calibration solution set, 84 µS/cm, 1413 µS/cm, 12.88 mS/cm and 111.8 mS/cm, 60 mL each

Applications

• Routine replacement of worn pH, ORP and ion cartridges
• Adding a new parameter to an existing WQ-320 or WQ-330 meter
• Extending reach with a 5 m cable for tanks, basins and wells
• Nutrient and ion monitoring in agriculture, aquaculture and wastewater
• Low-conductivity and ultrapure water measurement with the 2-cell cartridge
• Keeping spare cartridges on hand so a failed sensor does not stop a sampling run

Documentation

• LAQUA WQ-300 Series brochure and specifications (PDF)
• LAQUA WQ-300 Series instruction manual (PDF)

Complete WQ-300 meters and kits: HORIBA instruments.