direct connection cable to communicate with all digital
controllers [and smart thermostats] when directly connected.
b.
Provide notebook computer with the following features as a minimum:
(1)
Pentium III 600 MHz with active matrix color screen
(2)
Internal hard disk; minimum 6 Giga bytes
(3) Internal battery operation; for a minimum of 3 hours of
operation.
(4)
RAM; minimum 64 Megabytes
(5)
48X CD ROM and 3.5 inch 1.44 MB floppy drive
(6) Serial interface port to communicate with the digital
controller. Parallel port to communicate with a printer.
(7) Software: Digital control manufacturer's graphic DDC
software, and all other required programs installed. Windows 98,
2000, or NT operating system installed. Include all
documentation and original media.
2.2
SENSORS AND INPUT HARDWARE
2.2.1
Field Installed Temperature Sensors
**************************************************************************
NOTE: Selection of the type of temperature sensors
is dependent on the local activity. The designer
shall coordinate standardization of temperature
sensors with existing DDC projects, or local
activity requirements. No more than two types of
temperature sensors should be used in one project.
**************************************************************************
2.2.1.1
Thermistors
Precision thermistors may be used in temperature sensing applications below
200 degrees F. Sensor accuracy over the application range shall be 0.36
degree F or less between the range of 32 to 150 degrees F. Stability error
of the thermistor over five years shall not exceed 0.25 degree F
cumulative. Sensor element and leads shall be encapsulated. Bead
thermistors are not allowed. A/D conversion resolution error shall be kept
to 0.1 degree F. Total error for a thermistor circuit shall not exceed 0.5
degree F, which includes sensor error and digital controller A/D conversion
resolution error. Provide 18 gage twisted and shielded cable for
thermistors.
2.2.1.2
Provide RTD sensors with 1000 ohm, or higher, platinum elements that are
compatible with the digital controllers. Sensors shall be encapsulated in
epoxy, series 300 stainless steel, anodized aluminum, or copper.
Temperature sensor accuracy shall be 0.1 percent (1 ohm) of expected ohms
(1000 ohms) at 32 degrees F. Temperature sensor stability error over five
years shall not exceed 0.25 degree F cumulative. Direct connection of RTDs
to digital controllers, without transmitters, is preferred provided
SECTION 15910N
Page 35
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