Component 409:  Temperature Sensor by HVACSIM+

General Description
	Temperature sensors are modeled by a simple first-order differential 
equation with a single time constant.  The input to the component is modified 
using a gain and an offset supplied as parameters, allowing the output to be 
treated as a voltage level, a control signal, or a temperature in either 
Fahrenheit or Celsius.  If a Celsius temperature output is desired, an offset 
of zero and a gain of one are used.  If a control variable between zero and one
is required for use as a controller input, the offset is the minimum allowable
temperature and the gain is the maximum allowable temperature minus the minimum
temperature.

Nomenclature
	Ci - temperature input modified by gain and offset
	Co - output signal (e.g. sensed temperature)
	Ti - temperature input
	Tg - gain
	To - offset
	DeltaT - time step
	Toll - time constant

Mathematical Description
	Ci = (Ti - To)/Tg
	d(Co)/dt = (Ci - Co)/Toll
If the time constant, Toll, is greater than or equal to one second, the 
differential equation is solved outside the subroutine by the MODSIM, the main
HVACSIM+ program, differential equation solver.  If Toll is less than one 
second, the differential equation is solved within the subroutine:
	IF (Toll/DeltaT) < 0.05 OR | Ci - Co- | < 10^(-10) THEN
		Co = Ci
	ELSE
		Co = Ci - (Ci - Co-)*exp(-DeltaT/Toll)
where Co- is the value of Co one time step ago.

Component 409 Configuration
	Inputs		Description
	1	Ti	- temperature input
	2	Co	- temperature sensor output
	Outputs		Description
	1	Co	- temperature sensor output
	Parameters	Description
	1	Toll	- temperature sensor time constant
	2	To	- offset
	3	Tg	- gain

Reference:
1.	HVACSIM+ Building Systems and Equipment Simulation Program Reference 
	Manual (NBSIR 84-2996)
	Daniel R. Clark
	United States Department of Commerce
	National Institute of Standards and Technology
	Gaithersburg, Maryland  20899-0001