Graphtec WR3320 Linearcorder WR3310 4-Channel Flatbed Chart Recorder AZ3302

Graphtec WR3320 Linearcorder WR3310 4-Channel Flatbed Chart Recorder AZ3302

The Graphtec WR3320 Linearcorder is a four-channel flatbed analog chart recorder designed to continuously plot multiple signal inputs simultaneously onto fan-fold or roll paper. It uses a heated thermal stylus system to trace each channel's input signal as a continuous line across the chart paper, producing a permanent paper record of measured variables over time. The unit carries the WR3310 Linearcorder family designation and is equipped with four Graphtec AZ3302 amplifier input modules.

Specifications & What's Included

• Manufacturer: Graphtec Corp., Made in Japan
• Model: WR3320 (Linearcorder series, also designated WR3310)
• Number of channels: 4
• Included modules: 4x Graphtec AZ3302 amplifier input modules
• Input sensitivity range: mV / V selectable per channel (10, 20, 50, 100, 200, 500 mV/V settings visible on module selectors)
• Chart speed: 5, 10, 25, 50, 100, 250, 500 mm/min — selected via side-panel switches
• Chart speed modes: SEC, MIN, STOP, FAST
• Pen/stylus type: Heated thermal stylus (one per channel)
• Chart type: Fan-fold / roll paper (orange-grid thermal paper loaded)
• Channel inputs (rear panel): CH1 IN, CH2 IN, CH3 IN, CH4 IN — banana-jack (+/−/GND) per channel
• Monitor outputs (top panel): CH1 MON, CH2 MON, CH3 MON, CH4 MON
• External control: EXT CONTROL connector on rear panel
• Power: IEC AC inlet on rear panel; DC 100V label visible on rear
• Front/side controls: POWER ON/OFF switch, CHART EXT, TIMING, EVENT, HEAT, REWIND
• Status indicator: GREEN ON-LINE / RED OFF-LINE LED
• Date/time dials: Day, Month, Year, Hour, Min, Sec roller selectors on right panel
• Alarm functions: ALARM OUT, EVENT marker, TIMING marker
• Form factor: Benchtop / portable with carry handles
• Caution label (visible on unit): "Channels 1,2,3, Heat is turned off, i.e. turn on to use"
• Includes: 4x Graphtec AZ3302 modules, chart paper (loaded)

Applications

The Graphtec Linearcorder WR3320 belongs to a class of flatbed analog chart recorders widely used in industrial testing, laboratory research, and process monitoring from the 1970s through the 1990s. These instruments were the standard tool for capturing multi-channel analog data — pressure, temperature, voltage, strain, and similar continuously varying signals — as a time-based paper trace. The four-channel configuration allows simultaneous monitoring of multiple process variables, making it well suited to applications such as environmental chamber testing, pressure cycling tests, materials evaluation, and any process requiring a permanent paper record of time-correlated measurements. The AZ3302 amplifier modules condition and scale the input signals before they reach the stylus drive mechanism, allowing a wide range of sensor outputs to be recorded directly. Flatbed Linearcorder units like the WR3320 were common in aerospace, automotive, and academic labs where engineers needed a reliable, self-contained analog recording solution. While digital data acquisition systems have largely replaced paper chart recorders in new installations, these units remain in active use for legacy test programs, incoming inspection of analog sensors, and facilities that require paper-based documentation of test results.