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Moving Iron Ammeters And Voltmeters (Slide I Scale) |
DESCRIPTION |
Moving Iron Instruments are protected from damage or breakage under adverse condition due to its spring loaded jewel & pivot system. These Instruments are free from external magnetic field influences because of magnetic shielding & are 'CE' certified. These instruments have a very efficient oil damping system, which gives almost a deadbeat movement to the pointer, without irksome oscillation. The movement is light yet sturdy and has a large torque to weight ratio which assures long life to instruments.
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These indicate true RMS values practically independent of waveform even of high harmonics. The scale is compressed initially. Readability starts from 10 to 15 degree approximately.
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FEATURES |
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Scale |
Non-linear. |
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Suppression |
Initial suppression for Voltmeter & End suppression upto 6 times for Ammeter. (on request) |
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Scale Colour |
Special colour scales and marks for different ranges, (on request). |
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Housing |
Engineering plastic. |
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Terminal Protection |
Shrouded terminals to protect from accident, (on request). |
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Glass |
Anti - glare. (on request) |
ELECTRICAL SPECIFICATIONS |
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TYPE |
Moving Iron Slide In Scale. |
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OPERATING VOLTAGE
(For Voltmeter)
Burden |
15V to 600V.
100V / 110V for PT secondary.
15V to 30V - <100mA, 50V to 100V - < 30mA, 110V to 200V - <15mA,
200V to 600V - <7.5mA. |
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OPERATING CURRENT
(For Ammeter)
Burden |
1 A to100A in 72x72, 1A to 200A in 96x96
1A / 5A for CT secondary.
0.25A to 30A - < 1VA, Above 30A - < 1.5 VA. |
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FREQUENCY |
45 ~ 65Hz. (400Hz. on request). |
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ACCURACY |
Class 1.5 |
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DIELECTRIC TEST |
2kV RMS or 1 minute. |
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OVERLOAD CONTINUOUS |
1.2 times |
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OVERLOAD SHORT TIME |
2 times VN / 10 times IN for 5 seconds. |
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OPERATING TEMP. |
-10°C to 55°C |
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STORAGE TEMP. |
-20°C to 70°C |
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HUMIDITY |
upto 95% RH |
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CONFORMS TO |
I.S. 1248 / I.E.C. 60051 (Part 2). |
MECHANICAL SPECIFICATIONS |
MODEL |
SMI 72 (Slide in) |
SMI 96 (Slide in) |
SIZE ( mm ) |
72 x 72 x 60 |
96 x 96 x 60 |
PANEL CUTOUT ( mm ) |
68 x 68 +0.7 |
92 x 92 +0.8 |
SCALE LENGTH ( Appro. mm ) |
60 |
90 |
WEIGHT ( Appro. gms. ) |
<145 For 72 SQ Amps
<180 For 72 SQ Volts |
<200 For 96 SQ Amps
<230 For 96 SQ Volts |
Note : METERS ARE ALSO AVAILABLE IN 48x48x45 (SMI 48) & 144x144x60 (SMI 144) IN NON SLIDE IN DIAL VERSION. |
MODEL |
SMI 48 |
SMI 144 |
SIZE (mm) |
48 x 48 x 45 |
144 x 144 x 50 |
PANEL CUTOUT (mm) |
45 x 45 +0.6 |
138 x 138 +1.0 |
SCALE LENGTH (Appro. mm.) |
40 |
145 |
WEIGHT (Appro. gms.) |
100 |
400 |
Ordering information |
1) Type 2) Model 3) Operating Voltage & PTR Voltmeter 4) Operating Current & CTR For Ammeter.
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