GENERAL DESCRIPTION
The Apollo Intelligent Meter for Decade Volts (DC) Inputs (IMD1) accepts a
wide range of signals which can be precisely scaled into engineering units with
high resolution. One model accepts inputs from ±2 VDC to ±300 VDC using one
of four user selectable ranges (Refer to Appendix “A”). A full 6-digit display
accommodates nearly any engineering unit and holds large totalization values.
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 simplify initial set-up. 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 digital filtering enhances the stability of the reading.
Programmable remote input “E1-CON” pin can be utilized to control a variety
of functions, such as totalizing, alarm control, display hold or 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 999,999. It features independent scaling
and a low signal cut-out to suit a variety of signal integration applications.
Additionally, nine segments and offsets can easily be programmed with this
option to linearize transducers with non-linear outputs, such as square law
devices. Programmable remote input “E2-CON” pin is included with the option
and can be utilized to control a variety of functions, such as totalizing, alarm
control, display hold or tare operations, simultaneously with “E1-CON” pin.
Peak/valley (max/min) reading memory, and a signal re-zeroing (tare) function
are included with this option and they are easily recalled and controlled by either
the front panel or a remote input. 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.
Optional 20 mA loop, bi-directional serial communications provides
computer and printer interfacing to extend the capabilities of the indicator.
More than one unit can be connected in the loop with other RLC products
which have serial communications capabilities.
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 malfunctions. Extensive testing
of noise interference mechanisms and full burn-in make 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.
THEORY OF OPERATION
The IMD1 employs a microprocessor to perform the A/D conversion on the
input signal via a voltage-to-frequency converter. It digitally scales the result,
corrects for meter drift which may be present and then displays the result in a
6-digit display (5 for input, 6 for totalizer). The inputs are filtered to enhance
the stability of the display. A non-volatile E
2
PROM memory device provides
permanent data retention for operating variables. The display consists of drivers
and 6-digit solid-state LEDs. The alarm option employs opto-isolators to isolate
the open collector devices from meter common. Operating in parallel, the relays
are type Form-C and are rated at 5-amps. The serial communication option
features a built-in 20 mA current source and complete opto-isolation. The
analog option features a 12-bit DAC and provides an output signal that is
digitally scaled. The re-transmitted output is isolated from meter common.
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