Analog panel meters
Providence General Services is serving various Panel builders and contractors to supply various panel meters from variety of brands. Mainly we deal with two brands, CEWE and H Plus for Analog Panel Meters.
Panel instruments manufactured by Cewe Instrument are CE marked and produced in accordance to stated standards above. The electrical indicating instruments produced by Cewe Instrument comply with specifications IEC 60051, DIN 43802, DIN 43700, IEC 50081-1, IEC 50082-1, IEC 50081-2, IEC 50082-2, IEC 61010-1.
Analog Panel Meters:
Moving Iron Type
Moving Coil Type
Max. Demand Type
Frequency Meters
Power & PF Meter
Moving coil instruments:
Moving coil instruments are used for measurement of DC current and DC voltage. The movements have low power consumption and an approximately linear scale. Provided with a rectifier, the moving-coil instruments can be used for the measurement of sinusoidal AC current and AC voltage. In this case, the movement is average sensing, but the scale is graduated in r.m.s. The moving coil rectifier instrument is used where there are requirements for low power consumption (a linear scale from zero) or for measurements at high or varying frequencies.
Maximum Demand Ammeters:
Maximum demand ammeters with bimetal movements are used or the supervision of thermal load in transformers cables, motors etc. The thermal lag for the bimetal system is 15 minutes. The torque of the meter movement is great and its black pointer can move a red slave pointer, the position of which indicates the highest average value of the current. The slave pointer can be returned to the position of the black pointer with a special re-set knob. Maximum demand ammeters are also available in combination with a moving iron ammeter.
Frequency Meters:
The pointer frequency meter is fitted with a transducer combined with a moving coil movement, can be chosen with front flange dimensions 72 x 72 mm and 96 x 96 mm. If other sizes and designs are required, we recommend moving coil instruments in combination with Cewe Instrument’s measuring transducers, e g DF 125/127.
Power & Power Factor Meters:
Cewe Instruments watt, var and power factor meters incorporate a transducer feeding a moving coil meter. This produces a very solid and vibration proof instrument.
Features:
Accuracy of Analog Meters
ranges from 1.5 to 3.
Operating Temperature range of offered
Analog Panel Meters is between –25ºC and +50ºC.
Polycarbonate Housing. The
movements have pivot bearings, with highly polished pivots of
hardened steel and sapphire bearings.
Cewe Instrument’s instruments are well (magnetically) shielded and it is not necessary to state in which type of panel the meters will be mounted. In cubicles the moving iron instruments can be mounted in high magnetic fields. Our instruments are designed for these conditions. Most instruments are fitted with a zero (adjustment)-setting knob, by which the zero position of the pointer can be adjusted.
Removable Scales, with the Quadrant or the Circular Scale.
To prevent unintentional
contacts with the instrument terminals protective covers are
available as an accessory for instruments with front flange dimensions 48 x 48,
72 x 72 and 96 x 96 mm. The cover is snapped onto the rear of the instrument
after mounting and connecting the instrument leads.
Standard instruments are
made according to IP 54. Rubber gasket to seal against panel can be
obtained as an accessory.
High relative humidity and
corrosive environments in general to provide better environmental
protection, require good component quality and surface finish.
Relative humidity max 95% for max 30 days per year. Otherwise max 85% Year average max 75%.
The instruments are mounted with a snap-in mounting device as shown in the figure. This is a simple, reliable, and very time-saving method for mounting. There are no small screws or spring-clips to get lost.
