Specifications - Lord and Son Construction, Inc.

2.8.2.4 Thermowells
Thermowells shall be Series 300 stainless steel with threaded brass plug and
chain, 2 inch lagging neck and extension type well. Inside diameter and
insertion length shall be as required for the application.
2.8.3 Relative Humidity Sensor
Relative humidity sensors shall use bulk polymer resistive or thin film
capacitive type non-saturating sensing elements capable of withstanding a
saturated condition without permanently affecting calibration or sustaining
damage. The sensors shall include removable protective membrane filters.
Where required for exterior installation, sensors shall be capable of
surviving below freezing temperatures and direct contact with moisture
without affecting sensor calibration. When used indoors, the sensor shall
be capable of being exposed to a condensing air stream (100% RH) with no
adverse effect to the sensor's calibration or other harm to the instrument.
The sensor shall be of the wall-mounted or duct-mounted type, as required by
the application, and shall be provided with any required accessories.
Sensors used in duct high-limit applications shall have a bulk polymer
resistive sensing element. Duct-mounted sensors shall be provided with a
duct probe designed to protect the sensing element from dust accumulation
and mechanical damage. Relative humidity (RH) sensors shall measure
relative humidity over a range of 0% to 100% with an accuracy of +/- 3%. RH
sensors shall function over a temperature range of 25 to 130 degrees F and
shall not drift more than 2% per year.
2.8.4 Differential Pressure Instrumentation
2.8.4.1 Differential Pressure Sensors
Differential Pressure Sensor range shall be as shown or as required for the
application. Pressure sensor ranges shall not exceed the high end range
shown on the Points Schedule by more than 50%. The over pressure rating
shall be a minimum of 150% of the highest design pressure of either input to
the sensor. The accuracy shall be +/- 2% of full scale.
2.8.4.2 Differential Pressure Switch
The switch shall have a user-adjustable setpoint. The setpoint shall not be
in the upper or lower quarters of the range. The over pressure rating shall
be a minimum of 150% of the highest design pressure of either input to the
sensor. The switch shall have two sets of contacts and each contact shall
have a rating greater than it's connected load. Contacts shall open or
close upon rise of pressure above the setpoint or drop of pressure below the
setpoint as shown.
2.8.5 Flow Sensors
2.8.5.1 Airflow Measurement Array (AFMA)
Airflow Straightener.-AFMAs shall contain an airflow straightener if
required by the AFMA manufacturer's published installation instructions.
The straightener shall be contained inside a flanged sheet metal casing,
with the AMFA located as specified according to the published recommendation
of the AFMA manufacturer. In the absence of published documentation airflow
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