The Metrolog 420TA (4-20mA input - Terminal Assembly) can be used in any application where a 4-20mA current loop is available or 4-20mA transmitter is used. An optional flow input can be provided through an additional cable gland. The Metrolog 420TA is normally used with a depth transmitter and calibrated to record depth. The internal battery and software are capable of operating some types of 4-20mA 2-wire transmitters such as the PTX530 and PTX1830 (contact factory for more information). Alternatively, the unit can be connected to a remotely-powered 4-20mA loop to record any other parameter. With the optional flow input, the 420TA also measures flow by pulse count in the same way as the Metrolog P.

Current Measurement: Accuracy: Better than 0.1% at ambient temperature. Resolution: Better than 0.02%. Data logging time with 15 minute logging intervals: Almost 6 months.

Memory: Type: Solid state, non-volatile. Size: 32K.

Clock: Type: Crystal controlled calendar, with leap year adjustment. Accuracy: 100 seconds/month max. error over operating temperature range.

Recording: Interval: Programmable from 2 seconds to 24 hours. Method: Time-based or threshold logging. Modes: Rotating store or store until full.

Power Supply: Type: Internal lithium cell. Life: Greater than 5 years at 3-minute sampling rate. Output: Flash powered 11V supply for transmitter.

Environmental: Operating temperature: -10 to +50°C. Protection classification: IP65.