Emerson daniel 1500 series, Руководство пользователя

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8.3 Back pressure calculation for the LTM
Flow and pressure information is stamped on the nameplate located on the outside of the
meter.
• Back pressure at the outlet of the turbine meter must be sufficient for accurate
operation.
• Consider the following equation when determining back pressure for the turbine
meter.
Back pressure calculation Equation 8-1:
P
b
= 2
△
p + 1.25 p
e
P
b
Minimum back pressure, pounds per square inch gauge (psig).
Δp
Pressure drop through the turbine meter at the maximum operating flow rate for the
liquid being measured, pounds per square inch (psi).
P
e
Equilibrium vapor pressure of the liquid at the operating temperature, pounds per
square inch absolute (psia), gauge pressure plus atmospheric pressure.
• Open valves slowly to prevent system shock.
• Protect the Series 1500 housing and components from external impact of any kind.
Note temperature limitations when selecting turbine meter location.
8.4 LME remote operation
Note
LME should be remote mounted when the ambient temperature is above 60 ºC (140 ºF).
The primary output is a single or dual high resolution signal that is amplified and shaped by
an integral amplifier mounted within an explosion-proof housing. This wave pulse can be
fed directly to remote totalizing counters, digital readout devices, presets, or control
instrumentation.
NOTICE
Inspect all electrical connections to ensure compliance to electrical codes and safety
regulations.
Operation parameters
68 Daniel Series 1500 Liquid Turbine Meter, NPS 3-24