Appendix D: Sensor Calibration/Replacement Plan

The Sensor Calibration/Replacement Plan describes which sensors should be calibrated, how frequently they need to be checked, and the acceptable measurement range between the sensor and a hand-held calibrated device. Guidance on sensor replacement and field calibration checks for the new sensor are discussed in the Ongoing Commissioning Plan.

Sensor Calibration Plan - Template

Air Handler Calibration Points

POINT /

Acceptable Range

/

Frequency

Duct static pressure
Discharge air temperature
Return air temperature
Outdoor air temperature (2-point calibration)
Outdoor air humidity (2-point calibration)
Mixed air temperature

Chilled Water Plant Calibration Points

POINT /

Acceptable Range

/

Frequency

Supply water temperature (for each chiller)
Differential pressure sensor (across secondary pump headers)
Differential pressure sensor (across supply/return lines to AHU1)
Primary chilled water flow
Secondary chilled water flow
Secondary loop supply water temperature
Secondary loop return water temperature
Primary loop supply water temperature

Cooling Tower Calibration Points

POINT /

Acceptable Range

/

Frequency

Condenser water supply temperature
Condenser water return temperature (to cooling towers)
Condenser water supply temperature to heat exchanger
Condenser water return temperature from heat exchanger to tower
Computer units cooling water supply temperature
Computer units cooling water return temperature
Cooling tower sump temperature (each cooling tower)

Heating Hot Water Plant Calibration Points

POINT /

Acceptable Range

/

Frequency

Hot water temperature sensor T2
Secondary loop supply water temperature (2-point calibration)
Differential pressure sensor (across secondary pump headers)
Differential pressure sensor (across supply/return lines)
Secondary loop water flow measurement
Secondary loop return water temperature

Miscellaneous Calibration Points

POINT /

Acceptable Range

/

Frequency

Carbon monoxide (CO) sensors
Carbon dioxide (CO2) sensors
Building pressure interior sensor
Building pressure reference sensor

Critical Space Temperature Sensors

POINT /

Acceptable Range

/

Frequency

Non-Critical Space Temperature Sensors

POINT /

Acceptable Range

/

Frequency

Hand-held Measurement Device

(All hand-held measurement devices used to calibrate sensors should periodically be sent out forrecalibrationper the manufacturer’s recommendations and schedule)

Measuring Device /

Frequency

/

Calibration Company Name and Address

/

Phone #

The following form can be used for record keeping purposes. It can be useful in tracking sensors that are repeatedly going out of calibration to provide proof of a need for replacement. If a sensor must be replaced, a field calibration check on the new sensor must also be conducted to ensure that the proper offset for the new sensor is programmed into the EMCS.

Calibration Form

Point Name / Date Calibrated / Sensor condition and placement ok? (Y/N) / Field Measured Value (deg. F.) / EMCS value (deg. F.) / As-found EMCS offset from measured Temperature / New
EMS offset to correct to measured value / Final Measured Value / Final EMS value with notes

1

Ongoing Commissioning Plan Appendix D – Sensor Calibration/Replacement Plan Template