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Calibrated gas = Nitrogen (GCF
1
= 1.000)
Full scale range (FS
1
) = 100 slm
Secondary gas (FS
2
) = Hydrogen (GCF
2
= 1.0038)
1.0038/1 = 1.0038, 1.0038 x 100 = 100.38 slm of Hydrogen
Example 2- Changing the active gas record
Selecting the active gas record is accomplished in one of two ways:
1. Hardware setting
2. Software setting
Hardware:
The hardware setting is selected by accessing a rotary encoder on the upper PC board in the
electronics enclosure. When set to a number position from 0 to 7 it activates the corresponding
gas record. If a number greater than 7 is selected, then gas record control is passed to
software.
Software:
See Section 3.7 Multi-Gas Calibrations and the software manual for more information about the
software control capabilities.
The software setting will override the hardware settings. If gas records are changed through
the software setting and the rotary encoder is not changed, the software setting will be active.
However, when the meter is powered down and subsequently powered up, the active setting
will be based on the rotary encoder setting.
2.11. Electrical Remote Zero Connection
The Hastings 400 Series allows the flow meter zeroing operation to be activated remotely using
pins 8 and 9 of the analog terminal strip. (See Drawing in Quick Start Guide.) If these pins are
connected together, the meter initiates an internal routine that measures the current reading,
stores it in nonvolatile memory as a zero offset, and removes this value from all subsequent
readings. When the pin 9 is electrically isolated the flow meter operates normally. The typical
implementation of this type of remote zeroing operation involves connecting a remote switch
or relay to pins 8 and 9 of the terminal strip. (For more about the zeroing operation, see
Section 3.4)
2.12. Check Installation Prior to Operation
Before applying gas to the meter it is advisable to ensure that the mechanical and electrical
connections and digital communications (if applicable) are established and operating properly.
This can be done by following the guideline procedure below: