APC UCCS Temperature Control - Manual (Page 25)

JANUARY 2008 UCCS STANDARDS 15950-25
arrangement and rating suitable for application; line voltage units UL-listed.
E. CO
2
sensors:
1. (UCCS to add CO
2
sensor product requirements here)
(LEED EQc1: Carbon Dioxide Monitoring)
2.10 SOLID-STATE SENSING DEVICES
A. Space (room) sensors shall be surface-mounted. Space sensors shall have an exposed
sensing bead mounted behind a suitable protective enclosure. Sensors mounted to the back
of a blank junction-box cover are not acceptable.
B. Duct and immersion sensors shall be immune to moisture and shall have a junction box for
electrical connections. Sensing element shall be suitable for the application.
a. Provide averaging elements for all air temperature measuring applications, except for
return air applications and where noted otherwise.
C. Remote humidity sensors for outdoor applications shall be protected from adverse weather
conditions in a suitable enclosure provided by the manufacturer.
2.11 TRANSMITTERS - SOLID STATE
A. Transmitters shall have sensing elements suitable for the application.
1. Provide averaging elements for mixed and discharge-air temperature applications.
B. Transmitters shall have direct-acting, linear output signal compatible with controller, with
full scale accuracy of 1% or better. Zero and span shall be field-adjustable.
1. Transmitter sensing elements shall withstand continuous operating conditions plus or
minus 50% greater than calibrated span without damage. Air pressure transmitters
shall have a minimum overpressure rating of 10” W.C.
[Note to Consultant: Select either one or the other of the following pressure
transmitter sections for water, higher-pressure air (compressed air or vacuum sys-
tems, for example) applications. Determine which device to specify
based on the durability and/or required accuracy requirement of the specific
application]
[2.] [Water, Compressed Air, etc.- list application] pressure transmitters shall
have stainless steel diaphragm construction, proof pressure of 150 psi minimum, and
the accuracy shall be
0.2% of calibrated span. Transmitter shall be complete with 4-
20 mA output, required mounting brackets, and block and bleed valves. Mount in
location accessible for service. Foxboro 841 Series or approved equal.
[3.] [Water, Compressed Air, etc. - list application] pressure transmitters shall
utilize a thin-film-type strain gauge and stainless steel diaphragm. Unit shall have
+1% full-scale accuracy, 200% proof pressure rating, 4-20mA output and 1 msec