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Attach the SpanBox flow meter (LDAR# 1645) to the calibration tee.
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Verify the output of each SpanBox port is set to at least 0.5 L/min if using only a phx42, and 2.0 L/min if using a phx21 or a mixture of both.
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Ensure the flow meter is in an upright position.
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In Cal5.0, select Manual Box Control. Check the box for the input and output port you are testing first.
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Block the open leg of the calibration tee and read the flowmeter to verify it is set to the correct value.
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Repeat the process for each input and output combination until all ports have been checked for all available gases.
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If the flow is incorrect, adjust the flow regulator.
SpanBox5 & Cal5.0
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