GENERAL DESCRIPTION
The Apollo Intelligent Meter for Process Inputs (IMP) accepts standard process
signals and precisely scales them into engineering units with high resolution. One
model covers any current range within 0 to 50 mADC. A full 6-digit display
accommodates nearly any engineering units 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 IMP 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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