Teledyne Deltaflow DF180, Руководство по эксплуатации и обслуживанию, Страница: 12 / 42

January, 2018
Page 12
1.1.8 Sample Filters
The differential pressure transmitter used in the Deltaflow is meant to only come in contact with clean
non- corrosive air. The Deltaflow purges the sample lines at a minimum of every 6 hours to ensure they
stay filled with clean instrument air. As added protection, each side of the DP transmitter has sample
filters that contain 13X molecular sieve, soda lime, and indicating Drierite®.
Fig. 1-7 Sample Filter
1.1.9 Power Supplies
Two power supplies are used. A 120W 24VDC power supply powers all the onboard Deltaflow
electronics, valves, and switches. A 10W 12 VDC power supply is used as loop power for the analog
outputs. Both power supplies’ inputs are rated 100-240VAC, 50/60Hz and are automatically adapting.
Both power supplies have “DC Voltage OK” indicating LEDs to aid in troubleshooting. The 24 VDC power
supply has a DC voltage output adjustment potentiometer.
1.1.10 Precision Regulator
In order to minimize the drift of the upscale differential pressure used during the daily cal checks, a
precision regulator is used that drops the instrument air supplied by the user from 50 psi down to 1.5
psi. This low pressure instrument air is bled into the high side plumbing of the DP transmitter by SV6 at
the beginning the of the daily upscale cal check.
Fig 1-8 Precision Regulator