070 Series ANSI Switchboard Meters
51
LED Digital / Analogue Combination
The Crompton model 077-DI features a combination of the traditional 250° 41⁄2"
switchboard indicator with the benefits of wide angle visibility plus trend indication.
This rugged shock and vibration resistant taut band design provides precision
accuracy and instantaneous reading via the bright in dial mounted 31⁄2digit
LED display.
Description
Model 077-DI digital analogue indicators are ideal for all applications where moving
pointer instruments are preferable to indicate trend while simultaneously displaying
a high visibility precision LED readout for increased user interface.
Packaged in a weather resistant case, the 077-DI is interchangeable with other
analogue and digital instruments designed to directly mount in to a standard ANSI-
C39. 41⁄2" switchboard cut-out.
Available in side, center, or off-set zero versions the 077-DI can accept A.C. Current,
Voltage, Frequency, Watts, VArs and Phase Angle or D.C.Current and Voltage direct
inputs as well as a wide range of transducer outputs making it suitable for a variety
of other applications including low-load current, temperature, speed,
watt/vars,percent and level.
Specification
Inputs:
D.C. Voltage: 20mV-600V (1MΩinput impedance as standard)
D.C. Current: 1mA-1A, 4 to 20mA (Voltage drop 200mV nominal).
External shunt operation (50mV and 100mV).
A.C. Voltage: 200mV-600V (1 kΩ/ volt)
A.C. Current: 1mA-999mA (Using internal shunt,
voltage drop 200mV nominal). 1A, 2A, 5A & 10A using
internal current transformer.
Common mode rejection: =>80dB @ 50/60Hz
Overload: Voltage: x 1.2 continuous. x1.5 for 10 seconds.
Current using internal CT: x 1.2 continuous.
x 10 for 10 seconds.
External Power Requirement:
Standard: 120 & 240V ±15%.
Optional: 480V ±15% A.C. 40 to 60Hz
Burden: 3VA @ 60Hz
D.C.: Standard: 12, 24, 48,110 & 125V ±15%
Display Analogue: Long scale moving coil. 250° deflection. Scale
length 6.8inches. Response time less than 2.5 seconds.
Display Options: Center or offset zero. Scale plate in colors other than
white. Colored lines or segments on scale.
Slower response time.
Digital Display: 31⁄2digit red LED. 7 segment (7.6mm, 0.3" high).
Right hand decimal points. Polarity indication:
positive / none. Negative / horizontal bar “ - ”.
Update time (standard): 1 per second
Accuracy – Analogue: D.C & A.C: ±1% of FSD (calibrated at 25°C)
Accuracy – Digital: DC: ±0.05% of reading ±1 count ±100ppm of
reading / °C. (Maximum).
A.C. current: 0-1 Amp ±0.1% reading ±3 counts
±150ppm of reading / °C.
A.C. current: 0-10 amps ±0.1% reading ±10 counts
±150ppm of reading / °C (maximum)
A.C. Voltage: ±0.1% of reading ±3 counts ±150ppm of
reading / °C. (maximum)
Zero ±1 count ±0.2 counts/°C (maximum) D.C. offset
scale only Warm up time: 1 minute
Long Term Stability: ±2 counts
Calibration Check: Recommended 12 monthly intervals
Enclosure Code: IP54 (Optional IP55 using panel gasket)
Operational Temperature: 0 to +60°C (32° to 140°F).
Storage Temperature: -20 to +60°C (-4° to 140°F)
Humidity: Up to 90% relative @ 55°C. Tests to BS2011 part 2DA.
Isolation Test Voltage: 2kV RMS 60Hz for 1 minute
Interference Rejection: To IEEE STD472, ANSI C37 90A,
SEN 361503, IEC 255-4
Approvals: EMC and LVD
UL recognised file E140758
Features
Rugged shock and vibration taut band
design
High accuracy LED display
Wide selection of AC and DC inputs
Maximum trend indication visibility
Input isolation
External decimal point selection option
Interchangeable with 41⁄2" switchboard
meters
Benefits
Cost effective
Meets all the requirements of
ANSI-C39.1 (1981)
IP54 (NEMA 3) protection.
Optional IP55 (NEMA 4) gasket
Bump, shock and vibration proof
Customised options and features
Applications
Switchgear
Distribution systems
Generator sets
Control panels
Energy management
Building management
Utility power monitoring
Process control
Motor control
Approvals
UL recognised File No: E140758