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Digital Panel meters and switchboard meters
Hsiang Cheng Corp. ®
MEF Series, Digital Panel Meters
Process Panel Meters		  
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Hsiang Cheng, MF Series, Frequency Panel Meters
 
 
  Characteristics:  
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  • True process dc rate monitor
  • Wide range of dc voltage & current input
  • Scaleable in engineering unit
  • High accuracy of 0.05%
  • linear dc output or 24Vvdc power output (optional)
  • Two wire application
  • 3-3/4 digits of maximum 3999 counts
  • Display with super rate LED
  
 
  Product Description:  
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Model MEF is specially designed as DC versatile rate meter for process applications, it features
1. Wide range of DC input, over 10 voltage & current ranges as (0-20, 0-40mA or 0-10V ect.)
2. Scaleable display in required engineering units .rangeing from 0 to ±4000 counts.
3. Option of analog output of a mV per count, or simulated DC24V power applied to two wire system
4. Gain & offset ( fine & coarse adjustment both ) from 0 to 165% full scale

  
 
  Specifications :  
 
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Range:
Accuracy (23 + 3°C): 0.05% fs + 1 count
Stability :

Temperature coefficient < 50 ppm per degree C, long term draft < 0.1% per year
Digits & counts: 3-3/4 digits of maximum 3999 counts
Display : 0.56” super rate LED
   
Overload : Maximum 1 ampere for current input, maximum 250V for voltage input
Dielectric strength: 2KVrms / 1 minute, 50 / 60 Hz
Noise Rejection; Cmrr > 120 db, Nmrr > 100 db.
Common Mode Voltage: 2KVrms / 1 minute
Surge test : ANSI C37.90 / 1989, IEC 255-3 (1989)
Impulse voltage: 1.2 * 50 us 4 kv, oscillation wave 0.5us-100KHz 3KV, or 1 MHz-0.25ms 2.5KV
Auxilliary Power: AC ± 15% < 3.5 VA, DC ± 20% < 5 watts
Applied rules and standards
Measuring & conversion: IEC 688
Dielectric strength:

IEC 688

Impulse & Surge test: ANSI C37.90.1/1989
IEC 255-3 (1989)
Measuring reliability: VDE 3540
 
 
  Downloads:  
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  pdf_pic Downloads: General Specifications  
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