Signal conditioning
Streamline your installation with new digital panel meters
Acromag’s newest digital panel meters are powered by the 4-20mA loop with options for isolated analogue output and/or solid-state relays
These instruments supplement the digital indicator functions of a panel meter with optional 4-20mA isolator output and/or alarm trip solid-state relays. A dual-line LCD display has large 0.7 inch digits, an optional bargraph, and a backlight for clear visibility in bright sunlight or dim lighting. The backlight glows red and flashes under alarm conditions. No separate power supply is required for easy installation almost anywhere. They are even UL/cUL approved for use in hazardous locations requiring intrinsically safe, non-incendive devices. The VPM2000 displays are simple to set up and install. USB
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connection to a PC makes setup fast and easy with the free configuration software which can save the file for copying to other units. Front-panel pushbuttons can also set operating parameters and serve as function keys to change the display or acknowledge alarms. A shallow-depth 1/8 DIN enclosure with a NEMA 4X IP65 front panel facilitates mounting. Internal PCBs are conformal coated for protection from the elements while a -40 to 75°C operating range enables use in extreme environments. “These versatile instruments combine the functionality of a 4-20mA
signal isolator, a dual-relay limit alarm, and a digital display in a single unit that is powered off a process current loop,” explains Rober t Greenfield, Acromag’s business development manager.
he newest addition to Acromag’s Vertu brand of innovative instrumentation is the VPM2000 Series of loop-powered display meters with process current output and alarm capabilities.
Other advanced capabilities add fur ther value. Two open collector
outputs and a digital input are standard. The discrete outputs are useful for alarm indication or pulse output. The discrete input can trigger or reset alarms. Square root, exponential, and linearizer calculations perform scaling for flow and volume computation. The two-line display can show the measured process value in different scales such as tank height on the top line and volume on the bottom. Pushbuttons toggle display of min/max values or other units. Dual relays enable a variety of alarm trip configurations for high/low, high/high, and low/low limit triggers. Relays can also be used for process on/off control and pump alternation applications with display of runtime and cycle counts.
Acromag
www.acromag.com HigH Performance Signal conditioning for confined SPaceS
provides a precise 100 μA DC current source for measuring resistive transducers such as RTDs, thermistors or silicon diodes and is a suitable replacement for the National Instruments SCXI-1503. You can make a two, three or four-wire
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connection to the SCB-32CC via the supplied plug-in four-position spring clip connectors. Since the SCB-32CC does not contain a buffer, an external digitizer with a high-quality differential amplifier is recommended for lowest noise and best accuracy measurements.
he SCB-32CC-100μA is a member of Precision’s 1U family of rack mountable signal conditioners. The product
Packaged in a 1U rack mountable
enclosure, the Model SCB-32CC front panel features all of the operator interfaces including 32 sensor connectors, Ethernet connector with IP reset switch and status indicator, signal ground connector with ground source selection button, power entry connector and system power switch. The high accuracy of the single-ended constant current source delivers a current
level of 100 μA with ±0.03 per cent initial accuracy. Current flow to the load, voltage across the load and loop resistance are measured on demand using either the supplied graphical user interface (GUI) or the command line interface. The SCB-32CC has automatic calibration that can be run to optimise accuracy for a given ambient temperature. The optional Factory Acceptance Test
(option F) allows the user to perform automated NIST traceable verification of system performance on-site with a third- party digital volt meter.
www.pfinc.com
58 January 2021 Instrumentation Monthly
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