Monarch Instrument DC6000 - Manual (Page 60)

Section 5 – Recorder Setup
I.
Page 52
1/06/2012 REV 1.10.2
5.1.3.2 EnergySteam
This calculated channel computes energy from Steam rather than water. It requires an external steam
mass flow transmitter connected to an analog input channel. It uses external inputs to measure process
input and output temperatures and mass flow and uses look up tables (Enthalpy Steam Tables) and
mathematics to compute the energy. The formula is basically
Energy = Mass Flow x Enthalpy
Where the Enthalpy is the difference in between inlet and outlet temperatures. This calculation is for
Steam based systems and uses the Keenan and Keyes Steam tables to derive the Enthalpy
Select a channel type of EnergySteam. This will bring up
the Steam Energy Setup dialog box. There are three
external inputs required by the system
– two temperatures
and mass flow, these need to be set up beforehand on the
individual channels referenced.
Mass Flow: Select the channel the mass flow meter is on
and the units the mass flow is measured in using the drop
down menus. Choices are grams, kilograms (kg), pounds
(lb), Metric Ton (mton = 1000kg), Short Ton (ston (US) =
2000 lb) Long Ton (lton (UK) = 2240 lb) at a rate of
seconds, minutes, hours or days
– if these are not your
flow measurements you need to prescale this input
accordingly.
Supply/Return Temps: Select the channels for temperature measurement of the inlet and outlet points
for system temperatures. Temperatures can be in either °F or °C. The unit will take the absolute
temperature difference.
Energy Units: Select the resulting units for display – options are BTUs, Watts or Joules at varying rates.
Apply: Save the values and exit Cancel: Exit without making any changes
Fig 5.17 – Steam Energy Setup