TC-2200 Digital pH and Chlorine Tester

The Apure TC-2200 is an online residual-chlorine instrument with pH and temperature information in the listed configuration. The chlorine measurement uses the membrane-covered electrochemical arrangement described for the supplied sensor. Select the instrument, chlorine probe and sample-flow assembly as a matched system.

CHARACTERISTICS:

• Large screen lattic liquid crystal display.
• Multi-parameter simultaneous display: residual chlorine value, temperature, output current.
• With the recovery factory setting function, the slope correction function.
• Manual/ automatic compensation, NTC10K or PT1000.
• Optional RS485 communication: use the protocol and register map for the supplied version. Configure the 4–20 mA output scaling for the documented output parameter.
• Optoelectronic isolation 4-20mA current output.
• Hysteresis arbitrary setting function to avoid switching relay frequent action function.
• Watchdog function: make sure the meter doesn’t crash.
• Power failure protection>10 years.

Chlorine measurement and sample conditions

Specify the chlorine species required by the application and check that the supplied sensor is specified for that measurand. Free chlorine, combined chlorine, total chlorine and chloride are different measurement targets. A pH or ORP reading alone does not give a chlorine concentration.

For the membrane-covered electrochemical configuration, follow the probe instructions for sample pH, flow, temperature, pressure, conditioning and membrane/electrolyte maintenance. Confirm the operating limits of every wetted component, including the probe and flow cell. A temperature-display or compensation range is not a rating for the complete sample assembly.

Configuration, output and verification

The listed analogue output is one 4–20 mA signal. Confirm its assigned parameter and scaling. If RS485 is ordered, obtain the supported functions, register map and serial settings for that version; do not assume every function is supported by a generic Modbus driver.

Use the specified temperature element and compensation settings. Verify chlorine against the appropriate reference method for the required chlorine species, and calibrate pH with the buffer family selected in the instrument. Confirm parameter-specific accuracy, full-scale definitions and acceptance criteria for the ordered configuration; do not apply one percentage indiscriminately to pH and temperature.