Electronic Flow Sensing

Electronic flow sensor (EFS) calibration

Figure 4-3

EFS Flow-Measuring Adapter (Part No. 05890-80620)

5.Assuming there is no gas flow through the channel being calibrated, press ENTER at the keyboard. This updates the zero calibration value.

Setting the GAIN calibration value

After the zero calibration value is set at zero flow rate through the given channel, the gain calibration value must be set, based upon a measured flow rate.

1.At the keyboard, press FLOW : GAIN A (or GAIN B) is displayed, followed by two values (the observed flow rate through the channel,

and the current gain calibration value for the channel).

2.Reconnect the gas supply to the channel being calibrated. Do not reconnect the OUT fitting for the particular channel.

3.Using a suitable flow•measuringdevice (accurate to better than

1 ml/min) connected at the OUT fitting for the given channel, adjust flow through the channel so measured flow rate is approximately in the middle of the range to be used. For example, if the range of flow rates to be used is between 50 and 150 ml/min, measured flow rate should be adjusted to about 100 ml/min.

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