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MAXIMUM DEMAND METER
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DESCRIPTION

Maximum Demand meter is used for monitoring thermal loading in Power Distribution systems, Networks, Machines etc. It indicates maximum loading current over a period. Short-period current peaks are not registered but long overloads are registered.
In the Maximum Demand meter the measuring current flows through the bimetal spiral which is temperature sensitive. The free end of the spiral is connected to a black measuring pointer. The moving system is activated by heat generated by the current flowing through the spiral. The instrument is provided with an additional red slave pointer with a higher friction, which makes it to remain at its maximum position, which determines the maximum average loading current. The high torque of metallic movement drags the red pointer along with the black pointer. The red pointer remains stationary at the maximum value reached. This can be reset by rotating the knob provided on front facia. To prevent false indication due to fluctuations in ambient temperature, an additional bimetallic spiral is wound in opposite direction, which is mounted on the same spindle to compensate variation in temperature from -10 to + 55 degrees Centigrade.
Frequently there is a need to measure instantaneous current simultaneously & hence moving iron movement having the same range is incorporated in the same meter.


FEATURES
RMS measurement of maximum current. 20% overload capacity.
Long current peaks are registered. Instantaneous current measurement.
Red pointer to indicate maximum current reached. Sturdy movement.
Analogue Indication.

ELECTRICAL SPECIFICATIONS
TYPE BIMETALLIC; ANALOGUE AMMETER.
OPERATING CURRENT 1 Amp or 5Amp
FREQUENCY 40 ~ 65Hz.
ACCURACY 3% for resettable red pointer (Bimetallic).
1.5% instantaneous value pointer (Moving Iron)
THERMAL LAG (SETTING TIME) 15 minutes (standard) & 8 minutes (on special request).
VA BURDEN Approx. 3.5VA for Bimetallic Ammeters &
Approx. 4VA for Bimetallic And Moving Iron  Ammeter.
INSULATION RESISTANCE Greater than 20 Mohms at 500V DC
DIELECTRIC TEST 2kV rms for 1 minute.
OPERATING TEMP. -10C to 55C (for Analogue Instrument)
STORAGE TEMP. -20C to 70C
HUMIDITY upto 95% RH

MECHANICAL SPECIFICATION
MODEL MDIS 72 A MDID 72A MDIS 96A* MDID 96A*
SIZE (mm) 72 x72 x 70 72 x72 x 70 96 x 96 x70 96 x 96 x70
PANEL CUTOUT (mm) 68 x 68+0.7 68 x 68+0.7 92 x 92+0.8 92 x 92+0.8
SCALE LENGTH (Approx.) OF
BIMETALLIC SYSTEM
60mm 60mm 90mm 90mm
SCALE LENGTH (Approx.) OF MI SYSTEM N.A. 38mm N.A. 70mm
WEIGTH (Approx.) (gms) 180 200 230 250
* These models are available at present

PRIMARY
CURRENT
SECONDARY CURRENT 5AMPS OR 1AMPS
-SCALE-
MODEL MDIS 72A MDID 72A MDIS 96A MDID 96A
100% 120% 120% 200% 120% 120% 200%
10A 12A 12A 0......... 10/20A 12A 12A 0.................. 10/20A
15A 18A 18A 0......... 15/30A 18A 18A 0.................. 15/30A
20A 24A 24A 0..........20/40A 24A 24A 0...................20/40A
25A 30A 30A 0..........25/50A 30A 30A 0...................25/50A
30A 36A 36A 0..........30/60A 36A 36A 0...................30/60A
40A 48A 48A 0..........40/80A 48A 48A 0...................40/80A
50A 60A 60A 0.........50/100A 60A 60A 0.................50/100A
60A 72A 72A 0.........60/120A 72A 72A 0.................60/120A
75A 90A 90A 0........75/150A 90A 90A 0.................75/150A
80A 96A 96A 0.........80/160A 96A 96A 0.................80/160A
100A 120A 120A 0.......100/200A 120A 120A 0...............100/200A
125A 150A 150A 0.......125/250A 150A 150A 0...............125/250A
150A 180A 180A 0.......150/300A 180A 180A 0...............150/300A
200A 240A 240A 0.......200/400A 240A 240A 0...............200/400A
250A 300A 300A 0.......250/500A 300A 300A 0...............250/500A
300A 360A 360A 0......300/600A 360A 360A 0...............300/600A
400A 480A 480A 0......400/800A 480A 480A 0.................400/800
500A 600A 600A 0.....500/1000A 600A 600A 0.............500/1000A
600A 720A 720A 0.....600/1200A 720A 720A 0.............600/1200A
750A 900A 900A 0.....750/1500A 900A 900A 0.............750/1500A
800A 960A 960A 0.....800/1600A 960A 960A 0.............800/1600A
1000A 1.2kA 1.2kA 0............1/2kA 1.2kA 1.2kA 0....................1/2kA
1200A 1.4kA 1.4kA 0......1.2/2.4kA 1.4kA 1.4kA 0...............1.2/2.4kA
1500A 1.8kA 1.8kA 0.........1.5/3kA 1.8kA 1.8kA 0..................1.5/3kA
2000A 2.4kA 2.4kA 0............2/4kA 2.4kA 2.4kA 0....................2/4kA
2500A 3.0kA 3.0kA 0.........2.5/5kA 3.0kA 3.0kA 0.................2.5/5kA
3000A 3.6kA 3.6kA 0............3/6kA 3.6kA 3.6kA 0....................3/6kA
4000A 4.8kA 4.8kA 0............4/8kA 4.8kA 4.8kA 0....................4/8kA
5000A 6.0kA 6.0kA 0..........5/10kA 6.0kA 6.0kA 0..................5/10kA

Ordering information
1) Type 2) Model 3) Operating Current 4) C.T.R. 5) Thermal lag / Setting Time
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