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Chandler instruments have used two types of chart recorders: paper and digital.

A paper chart recorder provides a continuous, visual record of an instrument’s output by tracing a pen line on moving chart paper. The horizontal axis typically represents time, while the vertical axis represents the measured value (such as Bearden consistency (Bc), pressure, and temperature), scaled according to the recorder settings. To read the chart, identify the time of interest on the chart paper and then read the corresponding value where the pen trace intersects the vertical scale.

A digital chart recorder displays instrument measurements as time-based trends on a screen, with time on the horizontal axis and measured parameters (such as Bearden consistency (Bc), pressure, temperature, and motor speed where equipped) shown on labeled channels. To read the data, identify the time of interest on the trend and then read the corresponding value directly from the numerical scale or cursor readout for each parameter.

Key Operating Steps:

Setup: Place the tester on a level, sturdy surface and connect the gauge to be tested.

Preparation: Fill the reservoir with the recommended fluid (oil or water) and purge air from the system.

Apply Weights: Calculate the necessary weight for the desired pressure and place the calibrated, serialized weights onto the piston carrier.

Spin the Weights: on the table. Use the pump screw to float the piston. The piston should be between the 2 marked lines on the shaft.

Operate Pump: Use the screw pump/priming pump to increase pressure until the weight carrier rises and "floats" freely, typically within a mid-range, and rotate the weights to minimize friction.

Read/Compare: While the piston is rotating and floating, compare the gauge reading against the total weight value.