APC UCCS Temperature Control specifications SOLID-STATE Sensing Devices, Transmitters Solid State

arrangement and rating suitable for application; line voltage units UL-listed.

E.CO2 sensors:

1.(UCCS to add CO2 sensor product requirements here) (LEED EQc1: Carbon Dioxide Monitoring)

2.10SOLID-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.

2.11TRANSMITTERS - 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-

20mA 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

JANUARY 2008 UCCS STANDARDS 15950-25