London Electronics Model N21 panel meter

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London Electronics has released a compact, low-cost and easy-to-use panel meter, which can be configured with a USB connection. Being graphical, it allows users to create a digital and bar graph representation of the measurement. The front panel is a sealed to IP65, making it suitable for installation in wet areas.

All configuration settings can be saved to a file, which also stores the meter’s serial number. The Model N21 accepts 24 VDC, 24 VAC, 110 VAC or 230 VAC power as standard and has the capability to give a 24 VDC output at up to 30 mA to power a 4-20 mA loop.

A configurable alarm relay is also provided and the N21 and the units of measure can be customised to suit requirements.

The Model N21 accepts the following input signal ranges: -70 to +70 mV (for DC shunt signal measurement); -12 to +12 V (for 0-10 V process signals), -24 to +24 mA (for 4-20 mA process signals); -200 to +850°C ( PT100, 2- and 3-wire); -50 to 1200°C (Type J); and -50 to 1370°C (Type K).

The input signal can be averaged over a chosen time span from 0.5 to 20 s. The alarm relay is rated 250 VAC 0.5 A, resistive load. It can also have a programmable delay of 0-3600 s to prevent nuisance alarming caused by short-term variations.