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GENERAL DESCRIPTION
The Model 7558 (Strain Gage Input Meter) offers many features and
performance capabilities to suit a wide range of industrial applications. The 4½
digit meter employs advanced technology for stable, drift free readout, while
incorporating features that provide flexibility now and in the future with Plug-
in option cards. The plug-in card options allow the opportunity to configure the
meter for present applications, while providing easy upgrades for future needs.
The Strain Gage meter has two bipolar mV input ranges: 24 mV DC or
240 mV DC. The internal bridge excitation is selectable for 5 VDC or 10 VDC.
The excitation output is based on a reference, ensuring accurate and drift-free
readouts. A 16 point scaling feature compensates for square-law devices and
other non-linear process characteristics.
The meter provides a Max and Min reading memory with programmable
capture time. The capture time is used to prevent detection of false max and min
readings which may occur during burst testing or unusual process events.
The signal totalizer (integrator) can be used to compute a time-input product.
This can be used to provide a readout of totalized flow, calculate service
intervals of motors and pumps, etc. The totalizer can also accumulate batch
weighing operations (batch weight).
The meter has four setpoint outputs, implemented on Plug-in cards. The
Plug-in cards provide dual FORM-C relays (5 A), quad FORM-A relays (3 A)
or either sinking or sourcing quad open collector logic outputs. The setpoint
alarms can be configured in modes to suit a variety of control and alarm
requirements.
- High and low absolute, high and low deviation and band acting
- Balanced or unbalanced hysteresis
- On and off delay timers
- Auto reset or latching modes
- Reverse phase output and/or panel indicator
- Selection of alternate list of setpoint values
Plug-in cards also facilitate bus communications. These include RS232,
RS485 and MODBUS (Consult factory for other bus formats). Readout values
and setpoint alarm values can be controlled via bus commands. Additionally, the
meter has features that allow a remote computer to directly control the outputs
of the meter. This is useful during commissioning phases and diagnostic use.
With a communication card installed, set-up software allows configuration from
a PC. The configuration data can be saved to a file for later recall.
A linear DC output signal is available as a Plug-in card. The card provides
either 20 mA or 10 V signals. The output can be scaled independent of the input
range.
The features of the linear output card are:
- Output tracks either input, totalizer, max or min readings
- Programmable output update times
Once the meter has been initially configured, the parameter list may be
locked out from further modification in its entirety, or only the setpoint values
can be made accessible.
The meter has been specifically designed for harsh industrial environments.
With NEMA 4X/IP65 sealed bezel and extensive testing of noise effects to CE
requirements, the meter provides a tough yet reliable application solution.
LOAD CELL, PRESSURE AND TORQUE BRIDGE INPUTS
DUAL RANGE INPUT 24 mV OR
240 mV
SELECTABLE 5 VDC OR 10 VDC BRIDGE EXCITATION
OPTIONAL CUSTOM UNITS OVERLAY W/ BACKLIGHT
PROGRAMMABLE AUTO-ZERO TRACKING
16 POINT SCALING FOR NON-LINEAR CORRECTION
9 DIGIT TOTALIZER (INTEGRATOR) WITH BATCHING
PROGRAMMABLE FUNCTION KEYS/USER INPUTS
FOUR SETPOINT ALARM OUTPUTS (W/Plug-in card)
COMMUNICATION AND BUS CAPABILITIES (W/Plug-in card)
ANALOG OUTPUT SIGNAL (W/Plug-in card)
PC SOFTWARE AVAILABLE FOR METER CONFIGURA
TION
NEMA 4X/IP65 SEALED FRONT BEZEL
MODEL 7558 - 1/8 DIN STRAIN GAGE INPUT PANEL METER
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DIMENSIONS “In inches (mm)”
Note: Recommended minimum clearance (behind the panel) for
mounting clip installation is 2.1" (53.4) H x 5" (127) W.
PANEL CUT-OUT
...
Lebow
®
Products Inc.
Tel (800) 803-1164
Fax (248) 643-8142
www.lebow.com
CAUTION: Risk of electric shock.
CAUTION: Read complete
instructions prior to installation
and operation of the unit.
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