1. Set the flow meter on the dryer assembly to approximately 300 SCFH. Watch the humidity
display to see that the % RH is moving down to the specified setpoint.
Allow sufficient time for the chamber to stabilize when setting up and making adjustments,
especially if the chamber has been running with high humidity levels. Running the chamber at
higher than ambient humidity levels can cause moisture to collect in all areas of the chamber
including sensors and other components. This moisture must be removed before actual tests can
proceed at accurate, lower than ambient humidity levels.
CIRCULAR CHART RECORDER,
The Honeywell DR 4300 General Purpose Circular Chart Recorder uses reliable microprocessor
operation to generate dependable pen drawn analog traces on preprinted 10-inch (250 mm)
charts.
The two-pen model (
RCDR103)
accepts inputs from a temperature sensor and a humidity sensor.
The single-pen model
RCDR107
records temperature only.
temperature sensor is a highly accurate RTD. The humidity sensor is a Vaisala or equal which
utilizes the Humicap
®
sensor to measure relative humidity. The recorder uses disposable fiber-tip
ink cartridges for dependable recording with minimum maintenance. The recorders are housed in
a molded case with a glass windowed, gray gasketed door which protects internal components
while allowing easy access to the chart.
Input samples are taken at a rate of 2 times every 1.3 seconds. Each sample is amplified and
then converted to a digital signal which is isolated and passed to the microprocessor. Analog and
digital filters with fixed time constraints provide input signal smoothing as required. Standard
factory set up for chart speed is 7 day operation. Refer to the Chart Recorder’s User’s Manual to
change the chart speed settings for various chart speeds.
