Portable liquid-analysis checks with Yokogawa PH72-21-E-AA
The complete designation PH72-21-E-AA identifies a portable PH72 pH/ORP meter configuration. Use the full code when requesting a quotation or reviewing a spare. Selection of Yokogawa PH72-21-E-AA should account for the process or system interface, the supplied configuration and the records needed to support installation and future maintenance.
Key specifications
| Selection point | Specification / confirmation |
|---|---|
| Representative model | PH72-21-E-AA |
| Meter family | Portable pH and ORP measurement |
| Listed sensor package | 21: refillable pH sensor, 0.75 m cable |
| Language | E: English |
| Lifecycle | PH71/PH72 family discontinued |
Identify the supplied sensor package
PH72-21-E-AA is a portable meter configuration, with its sensor package defined by the full ordering code. The PH72 platform supports pH and ORP measurement with the appropriate dedicated electrode. For PH72-21-E-AA, confirm which sensor is included; the presence of ORP capability in the meter family does not mean that every supplied package includes an ORP electrode.
A useful field comparison needs a procedure
Before using PH72-21-E-AA for a comparison with a fixed analyzer, establish the sample location, temperature, calibration condition and time of measurement. Different sampling conditions can produce a difference that is unrelated to meter accuracy. Keep buffer information, sensor condition and the PH72-21-E-AA identification with the recorded result so the comparison can be interpreted later.
Plan for legacy equipment support
The manufacturer lists the PH71/PH72 family as discontinued. For PH72-21-E-AA, verify the availability of the instrument and the dedicated sensor before purchasing for an existing maintenance procedure. Check connectors, cable condition, storage and care requirements when inspecting a supplied unit. Retain calibration and functional-check records for PH72-21-E-AA rather than assuming the condition of the sensor from the condition of the meter case.
- Included electrode and cable length
- Sample temperature and calibration buffers
- Dedicated sensor connection and storage
- Availability, condition and calibration record
Sensor and sample information to provide
State the liquid composition, expected measurement range, temperature and sample location. Identify the analyzer or meter, sensor connection, cable and fitting included in the required supply. For an existing installation, include calibration information and any cleaning or fouling history that affects selection. A complete enquiry should also distinguish a bare sensor from an assembled measuring package and specify the documentation needed at delivery. Preserve the exact PH72-21-E-AA designation on the enquiry and confirm the offered PH72-21-E-AA configuration before release.
Ordering and delivery details
For a quotation on PH72-21-E-AA, state the quantity, required delivery schedule and whether the supply is for a new installation or an installed-equipment replacement. Include a legible nameplate where available and identify the documents required with the shipment. Confirm the offered PH72-21-E-AA code, included accessories and configuration details in writing before release so the delivered package can be checked against an agreed scope.
