Master 3420 measures important electrical parameters in 3 phase and single phase Network & replaces the multiple analog panel meters.
It measures electrical parameters like AC current, Voltage, frequency, active energy import & active energy export.
The instrument has optional output as one pulse output or two pulse output for energy measurement.
On site programmable PT/CT ratios
It is possible to program primary of external potential Transformer (PT), primary of external Current Transformer (CT) on site via front panel keys by entering into Programming mode.
User selectable CT Secondary 5A/1A
The secondary of external Current Transformer (CT) can be programmed on site to either 5A or 1A using front panel keys.
User selectable 3 phase 3W or 4W
User can program on site the network connection as either 3 Phase 3 Wire or 4 Wire using front panel keys.
Low back depth
The instrument has very low back depth (behind the panel) of less than 80 mm in spite of optional features like pulse output.
Onsite selection of Auto Scroll / Fixed Screen
User can set the display in auto scrolling mode or fixed screen mode using front panel keys.
Onsite Adjustable display update time
User can program onsite the display from min 1 sec to 5 sec using front panel keys.
Phase reversal indication
The instrument can detect wrong phase sequence or failure of one of the input voltages. It displays "phase reversal" error message when phase sequence of 3 Phase Voltages is not correct or when one or two phases out of the three phases fail. The instrument will not display any measured values until the correct phase sequence is restored. (When all the 3 input voltages are absent, the "Phase reversal" error message is not displayed and instrument shows measured values)
Active Energy measurement (kWhr Import /kWhr Export)
The instrument has 2 Active energy counters, one for import and another for export.
True RMS measurement
The instrument measures distorted waveform up to 15th Harmonic.
Number of parameters measured: up to14
The instrument measures 14 electrical parameters of 3 Phase network.
Parameter Screen recall
In case of power failure, the instrument memorizes the last displayed screen. The displayed screen will get memorized only if user keeps this screen for minimum 40 sec duration before power failure for fixed screen mode.
Energy Count Storage
In case of power failure, the instrument memorizes the last energy count. Every 40 sec, the instrument updates the energy counter in the non-volatile memory.
User selectable Low Current suppression (Below 30 mA)
User can suppress the readings below 30 mA in the current measurement by onsite programming if required.
Min Max storage of parameters possible
The instrument stores minimum and maximum values for System Voltage and System Current. Every 40 sec minimum and maximum readings are updated.
Optional Pulse Output (1 or 2 Relay output)
The optional pulse output is a potential free, very fast acting relay contact which can be used to drive an external mechanical counter for energy measurement.
High brightness 3 line 4 digits LED display
Simultaneous display of 3 Parameters
Enclosure Protection for dust and water
Conforms to IP 54 (front face) as per IEC60529
Compliance to International Safety standards
Compliance to International Safety standard IEC 61010-1- 2001
Compliance to International standard IEC 61326