GENERAL DESCRIPTION
The Apollo Intelligent 5 Amp AC Current Meter
(IMH)
accepts AC currents
up to 5 amps and precisely scales them into engineering units with high
resolution. With the use of an external 5 amp AC current transformer, of any
ratio, currents of any magnitude can be measured and displayed. The meter is
calibrated from the factory to display RMS value of a pure sinusoidal signal. The
input is AC coupled to eliminate any DC effects in the signal. True RMS readings
are not obtained from complex waveforms, such as square waves, signals that
have been rectified or chopped due to a circuit with an SCR or Triac outputs.
These kind of complex waveforms will cause average value readings.
Examples of such waveforms are shown below:
Example A is an undistorted sinewave and the IMH will indicate true RMS.
With the complex waveforms shown in Examples B and C, the meter will
indicate average value.
Internal resolution of 1 mA allows detection and indication of the smallest
signal change. A two Hz, two pole, low-pass filter coupled with programmable
digital filtering can be tuned to match the characteristics of any process. A digital
tare
(re-zero)
operation can be performed at a touch of a button along with recall
of process peak and valley
(max/min)
. State-of-the-art digital circuitry virtually
eliminates errors due to drift. A full complement of option packages is available
to fulfill many process applications.
The indicator features a choice of two different scaling procedures which
greatly simplifies initial set-up. A full 6-digit display accommodates virtually
any process engineering unit. English-style display prompts and front panel
buttons aid the operator through set-up and operation. A front panel lock-out
menu protects set-up data and operation modes from unauthorized personnel.
Programmable remote input
“E1-CON”
can be utilized to control a variety of
totalizing, alarm control, display hold and tare operations. All set-up data is
stored in E
2
PROM, which will hold data for a minimum of 10 years without
power.
An optional integrator
(totalizer)
/linearizer can be used to totalize or integrate
signals up to a maximum display value of 999999. It features independent scaling
and a low signal cut-out to suit a variety of signal integration applications.
Programmable remote input
“E2-CON”
pin is included with this option and can
be utilized to control a variety of functions, such as totalizing, alarm control,
peak/valley readings, display hold or tare operations, simultaneously with
“E1-CON”
pin. Additionally, nine slopes and offsets can easily be programmed
to linearize processes with non-linear outputs, such as square law devices.
Peak/valley
(max/min)
reading memory, and a signal re-zeroing
(tare)
function
are included and they are easily recalled and controlled by the front panel. All
readings are retained at power-down.
Optional dual relays with parallel solid state outputs are fully programmable
to operate in a wide variety of modes to suit many control or alarm applications.
An optional 4 to 20 mA or 0 to 10 VDC re-transmitted analog output can be
scaled by the user to interface with a host of recorders, indicators and controllers.
The type of analog output is determined by the model ordered. (See Ordering
Information for available models.) The indicator has several built-in diagnostic
functions to alert operators of most any malfunction. Extensive testing of noise
interference mechanisms and full burn-in makes the indicator extremely reliable
in industrial environments. The die-cast front bezel meets NEMA 4/IP65
requirements for washdown applications, when properly installed. Plug-in style
terminal blocks simplify installation and wiring change-outs.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in the
manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
Do not use this unit to directly command motors, valves, or other actuators not
equipped with safeguards. To do so, can be potentially harmful to persons or
equipment in the event of a fault to the unit.
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