Teledyne Deltaflow DF180, Operation And Maintenance Manual, Page: 11 / 42

January, 2018
Page 11
Fig. 1-6 Stack Temperature Transmitter
1.1.7 Precision Differential Pressure Switch
In order to provide a repeatable upscale differential pressure for daily calibration checks, a precision DP
switch is tied into the high side of the DP transmitter plumbing. During the beginning of a span check
this DP switch will shut off SV6 when it senses the correct pressure has been achieved on the high side
of the DP transmitter. This provides a repeatable and stable differential pressure to check the pneumatic
and electrical drift of the DP transmitter. The DP switch set point is adjustable via a screw at the left end
of the switch spring housing. These switches come in various ranges, see Appendix B: Spare Parts for a
complete list of all the available ranges.
Fig. 1-7 Precision Differential Pressure Switch