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Pneumatically connect the transmitter's pressure ports to each other.
The barbed pressure connections accept O.D. 1/4 in × I.D. 1/8 in tubing.
- Measure the analog output of the transmitter to establish the zero offset reading in the as-installed position.
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If the reading is not at the middle of the output range (for example, 12 mA for 4 … 20 mA output), the zero point of the transmitter has shifted.
To remove the zero shift, adjust the transmitter as described in PDT101 adjustment.