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Sensorex will demonstrate its latest sensor technology – including the calomel free pH electrode, the FCL Series free chlorine sensor and the CLD Series chlorine dioxide sensor – at Pittcon 2011.

According to the company, which will be found in Booth 1829, the calomel free pH electrode offers the performance of calomel electrodes without the hazardous mercury associated with other electrode designs.

The calomel-free, green-friendly design features an Ag-/AgCl-based double-junction reference with a silver-ion trap acting as a third junction to impede any silver-ion contact with the sample.

Reference output is adjusted to deliver the same output as a calomel electrode using a silver chloride reference.

While traditional pH electrodes have been made of all-glass construction, today’s thermoplastics allow pH electrodes such as the calomel free to be constructed with durable and chemically resistant bodies to reduce breakage.

The protected design of the plastic body electrode extends over the measuring surface so that the pH glass bulb is virtually unbreakable.

The calomel free pH electrode is available in both sealed and refillable styles.

Sealed references are gel filled and maintenance free.

Refillable designs allow the user to extend electrode life by refilling the reference electrolyte.

The FCL Series free chlorine sensor features a precise amperometric sensor that measures free chlorine in real time and is available in three measurement ranges.

The sensor’s long-life design reduces maintenance cycles, which lowers lifecycle costs with less frequent sensor membrane cap/solution replacement and reduced technician installation time.

After hypochlorous acid (HOCl) diffuses through the FCL sensor’s membrane, it is electrochemically reduced, releasing electrons and creating a current flow proportional to the free chlorine concentration in the medium outside the sensor.

The low-current output is then conditioned to a 4-20mA direct output.

The flexible, low-maintenance CLD Series chlorine dioxide sensor is available in two measurement ranges for real-time, amperometric chlorine dioxide measurement with a 4-20mA output.

The sensor’s long-life design also reduces maintenance cycles, which lowers lifecycle costs with less frequent sensor membrane cap/solution replacement and reduced technician installation time.

The CLD sensor is installed via the Sensorex FC72 flow cell with 0.25in FNPT threads or as a direct drop-in replacement for other ClO2 sensors.

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