Electronic LED Frequency Meter
DESCRIPTION

It is used to measure the applied frequency, functionally similar to vibrating reed meter. The meter incorporates light emitting diodes LEDs which are used instead of vibrating reeds to indicate applied frequency. The frequency is determined by blinking LEDs. When applied frequency matches with the frequency marked on the dial, that particular LED blinks with maximum intensity. When the applied frequency is mid way between two adjacent LEDs, both LEDs blink. When the meter is switched on all the LEDs glow sequentially for a period of 1 to 1.5 seconds, thereafter it will indicate the applied frequency.

All voltage ranges are available in single meter. Terminal screws with washers are provided only for specific voltage as per requirement & remaining two terminals are covered with insulated caps.
In case of 96mm & 144mm instruments, two sets of LEDs with the same scale range can be offered, giving two independent meters in one casing (Dual Scale). This facilitates in comparing the frequency of two voltage supplies for paralleling operation.

FEATURES
• No vibrating parts.
• No aging effect.
• Faster response.
• Lighter in weight.
• Low power consumption
• No effect of external vibration
• Visible in dark & from distance.

ELECTRICAL SPECIFICATIONS
• TYPE ELECTRONIC
• OPERATING VOLTAGE 110V~125V, 220V-250V, 380V~440V.
• POWER CONSUMPTION Less than 3VA (Single scale), Less than 6VA (Double scale).
• MEASURING METHOD Time measurement between consecutive cycles.
• DISPLAY Box LED, Colour Red/Green, Size 6.3 X 3.7mm
• SAMPLING RATE 2-3 samples/sec.
• RESPONSE TIME Less than 1 sec.
• INSULATION RESISTANCE Greater than 20 Mohms at 500V DC.
• DIELECTRIC STRENGTH 2kV RMS for 1 minute.
• OPERATING TEMP. -10°C to 55°C
• STORAGE TEMP. -20°C to 70°C
• HUMIDITY Upto 95% RH
• CONFORMS TO I.S. 1248 / B.S. 89. / I.E.C. 51. (Part - 4)

AVAILABLE RANGES
MODEL       ELFS 72 ELFS 96 ELFS 96 ELFS 144 ELFS144
RANGE Resolution LEDS Acc.
# 		Single Scale Single Scale Double Scale Single Scale Double Scale
45 -50 -55 * 13 ±1
47 - 50 -53 0.5Hz 13 ±1
55 - 60 - 65 * 13 ±1
57 - 60 - 63 0.5Hz 13 ±1
370-400-430 5Hz 13 ±1
45 - 50 - 55 0.5Hz 21 ±1 -- --
48 - 50 - 52 0.2Hz 21 ±0.5 -- --
55- 60 - 65 0.5Hz 21 ±1 -- --
58 - 60 - 62 0.2Hz 21 ±0.5 -- --
380-400-420 2Hz 21 ±0.5 -- --

# % of center frequency       Available models
* There are 11LEDs in a row in steps of 1Hz for range (45-50-55Hz)/(55 - 60 - 65Hz) with additional 2    LEDs for (49.5 and 50.5Hz) / (59.5 and 60.5Hz) respectively.

NOTE : Frequency Meter For Other Range / Resolution Shall Be Supplied on Request If Feasible

MECHANICAL SPECIFICATIONS
MODEL ELFS 72 ELFS 96 ELFD 96 ELFS 144 ELFD 144
SIZE (mm) 72 x 72 x 70 96 x 96 x 70 96 x 96 x 70 144 x 144 x 60 144 x 144 x 60
PANEL CUTOUT (mm) 60 x 60+0.7 92 x 92 +0.8 92 x 92 +0.8 138 x 138+1.0 138 x 138+1.0
WEIGHT (Approx.) 350gms. 400gms. 600gms. 500gms. 700gms.

TERMINAL ARRANGEMENT
ELFS 72 ELFS 96 / ELFD 96
 
ELFS 144 ELFD 144

Ordering information
1) Type 2) Model 3) Range 4) Operating Voltage
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