 Analogue Meters
- Moving Iron Meters
- Moving Coil
Rectifier Meters
- Moving Coil Meters
- Maximum Demand
Meters
- Synchronoscope
Meters
- Power Factor Meters
- Frequency Meters
- Power Meters
- Process Indicator
Analogue Instruments
General Information about the Analogue Meters
1) Mechanical and Electrical Features
1 .1) Insulating
Voltage
2 kV during one minute between the internal mechanism
and the case, and between terminals which are
electrically isolated.
1.2) Permanent
Overloads
Voltage
circuits: 1.2 Un
Current circuits: 1 .2 In (1.5 In
for moving iron devices).
1.3) Short-time Overloads
Voltage
circuits: 2 Un during 5 S
Current circuits: 5 In during 30 s
10 In during 5 s
40 In during 1 S
2) Parameters which
Influence on the Accuracy Class
2.1) Mounting Position
All the devices are to be mounted in a vertical position. On request they can be supplied for a horizontal or inclined mounting. The tolerance is ±5° for any alternative.
2.2) Ambient
Temperature
The effect of the temperature on the accuracy class
depends on the measuring range. Generally, the devices
keep their accuracy class between +10°C and +30°C.
This interval can be lower for especially low
measuring ranges, in this cases the limit values are
indicated in the scale.
On the request the
devices can be adjusted for temperatures which are
outside the above mentioned interval.
2.3) Relative Humidity
The accuracy class is stable within an interval from
the 25 to 95% non-condensed relative humidity
2.4) Magnetic Field
All the devices keep their accuracy class under the
influence of an external magnetic field with a value
£ 0.5 mT.
2.5) Auxiliary
Supply
The accepted tolerance for the rated values of the
auxiliary supply is:
voltage : +10%/ -15%
frequency: 45 ... 65 Hz
2.6) Temperature Limits
The measuring instruments and their accessories can
operate properly with temperature changes from -25°C
to +40C (55°C for the tropicalised version) without
any permanent fault.
2.7) Tropicalised Meters
(TROP)
As per DIN 40040, the devices are protected against
corrosive environment and operate between temperatures
from –25 oC to +55C, with a non-condensed
relative humidity of 95%.
2.8) Vibrations
The instruments and their accessories can operate with a
vibration up to ±0.25 mm of amplitude with a frequency
of 50 cycles/sec. This vibration is equivalent to the
application during 20 minutes of an acceleration of 2.5
g to three perpendicular axis.
2.9) Impacts
The instruments and their accessories resist five
impacts with an acceleration of 15 g. applied in the
three perpendicular axis direction.
2.10) Protection Degree
Instrument cases have a IP 52 protection. In addition,
instrument terminal covers provides IP2O protection;
prevents people from making contact with live
connection.
2.11) Boxes
The boxes and frames of all the devices are made of
self-extinguishing (as per UL 94) and hit-resistant ABS.
The dimensions of the boxes and frames fulfill with DIN
43700 and DIN 43718, respectively. The bases are made of
strengthened self-extinguishing (as per UL 94) PPO, with
a high hit-resistance and a maximum electric isolation
2.12) Scales
As per following standards: DIN 43701 for end scale
values.
DIN 43802 for division values.
The end values of scales bigger than 1000 are indicated in thousand units.
2.13) Standards
lEC 51, VDE 410, DIN 43780, BSB9, UL94, EN 60051.
2.14) Approvals
Lloyd’s Register of Shipping
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