|
PART 1 - GENERAL
|
| 1.1
|
RELATED WORK
|
|
A.
|
Section 15900 - CONTROL SYSTEMS INTEGRATION. |
|
B. |
Section 15000 - PIPING SPECIALTIES |
| 1.2
|
REFERENCE
|
|
A. |
The Work under this section is subject to requirements of the
Contract Documents including the GENERAL CONDITIONS,
SUPPLEMENTARY CONDITIONS, and sections under Division 1 PROJECT REQUIREMENTS. |
| 1.3
|
SUBMITTALS
|
|
A. |
Devices shall be indexed by bill of
material for each system as detailed in Section 15900 - CONTROL SYSTEMS
INTEGRATION. |
|
B. |
Thermostat/Room Sensor Schedules: |
|
|
1. |
Submit thermostat/room sensor schedule with
shop drawings. Thermostat/room sensor schedule shall have detailed listing
of which type is used for each room including data concerning service and
model numbers, sizes, cover types, and engineering data sheets for each
control device. |
| 1.4
|
FCC
COMPLIANCE |
|
A. |
Digital equipment furnished under
this contract shall have been tested and made to comply with the limits
for a Class A computing device pursuant to Subpart J of part 15 of FCC
Rules, which are designed to provide reasonable protection against
interference when operated in commercial environment.
Literature shall so note and all equipment shall be so labeled. |
|
PART 2 - PRODUCTS |
| 2.1 |
GENERAL |
|
A. |
Pressure and temperature ratings of
devices indicated in Part 2 - PRODUCTS are minimum required.
All devices shall be designed to withstand maximum pressure and
temperature encountered in the system. |
| 2.2 |
GENERAL
INSTRUMENTATION |
|
A. |
Pressure Gauges: |
|
|
1. |
Refer to Section 15000. |
|
B. |
Thermometers: |
|
|
1. |
Refer to Section 15000. |
| 2.3 |
DISCRETE
ELECTRIC INSTRUMENTATION |
|
A. |
General: |
|
|
1. |
Electrical devices, switches, and relays shall
be UL listed and of type meeting current and voltage characteristics of
the project. Terminal
connections shall be made at terminal blocks inside of NEMA 1 enclosures
unless otherwise specified. Outdoor units shall be NEMA 4 with concealed
adjustment. |
|
|
2. |
Ratings of normally open and closed contacts
shall be adequate for applied load (Minimum 5 amps at 240 volts). |
|
|
3. |
Accuracy of devices shall be ± 1% of scale
with adjustable offset unless otherwise specified. |
|
|
4. |
Unless otherwise stated, space thermostat
covers shall be brushed aluminum or plastic enclosures. |
|
B. |
Temperature
Low Limit Switches (Freezestats): |
|
|
Manufacturers: Automation
Components Inc or approved equal |
|
|
1. |
Electric 2 position type with temperature
sensing element with automatic and manual reset. Controls shall be capable
of opening circuit if any one foot
length of sensing element is subject to temperature below setting. |
|
|
2. |
Sensing element shall not be less than one
lineal foot per square foot of coil surface areas.
Unless otherwise indicated, calibrate temperature switch setpoint
to 38°F. |
|
|
3. |
The sensing element shall be made of a vapor
filled, tin plated copper capillary tube with an optional lengths of 6, 10
or 20 feet long. Also have
availability of (1)SPDT or (2) SPDT. |
|
|
4. |
Where multiple switches are required, provide
separate point names for each in the BAS.
Each alarm in the BAS shall indicate which temperature low limit
has opened or tripped. |
|
C. |
Pressure
Differential Switches (Air Systems): |
|
|
1. |
Manufacturers:
Automation Components Inc or approved equal. |
|
|
2. |
Adjustable set point, differential pressure
type for fan proof of flow. Select
switches for accuracy, ranges (20 to 80% of operating range) and dead-band
to match process conditions, electrical requirements and to implement
intended functions. |
|
|
3. |
Pressure differential switches for air systems
shall have pressure rating of at least 10" WC. These units will have
field adjustable capabilities and manual or automatic reset
features. |
|
|
4. |
Pressure switches shall have an nema 1 or nema
4 enclosure option available and ½” conduit connection. |
|
D. |
Current
Switches: |
|
|
1. |
Manufacturers:
Automation Components Inc or approved equal. |
|
|
2. |
Induction
type sensor clamped over single phase AC electrical power conductor shall
be a solid state sensor with fixed or adjustable threshold and normally
open or normally closed contacts. Select each current switch for proper
operating range of current. |
| 2.4 |
PNEUMATIC
INSTRUMENTATION |
|
A.
|
Multi-Probe
Air System Static and Air Flow Sensing Elements: |
|
|
1. |
Manufacturers:
Automation Components Inc. |
|
|
2. |
Multi-probe type static and/or
total pressure sensing station consisting of minimum 16 gauge galvanized
casing with flanged connection and multiple metallic sensors with
automatic averaging manifold. Arrange
sensors to perform equal area traverse of duct cross section.
Maximum temperature: 250°F
Airflow resistance: less than or
equal to 0.25" WG at 4000 fpm
Accuracy: ± 2% of full scale within
velocity range from 700 to 4000 fpm
|
|
|
3. |
Provide aluminum honeycomb cell air
straightener devices for unit installed in supply or filtered air streams. |
|
B. |
Single-Probe
Air System Static Sensing Elements: |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal. |
|
|
2. |
Sensors shall be similar to Automation
Components Inc. ACI/PT and 1/4" l tubing connections for 3/8” O.D.
tubing. |
| 2.5 |
ANALOG
ELECTRONIC INSTRUMENTATION |
|
A. |
Space
Temperature Sensors: |
|
|
1. |
Manufacturers: Automation Components Inc or
approved equal |
|
|
2. |
Sensors shall be platinum RTD
type, with the following minimum performance:
Temperature Coefficient:
.00385 or
.00375 ohm/ohm/°C
Accuracy:
± .12% (±0.1C°) between 32°F and 150°F
Conformance:
DIN-IEC 751
Operating Range:
32°F to 150°F
0 to 99% RH |
|
|
3. |
Thermistors will be acceptable in lieu of RTD
provided thermistor carries 5-year guarantee that device will maintain its
accuracy within tolerance of ± 0.36°F
between 32°F and 150°F. |
|
|
4. |
Space sensor covers shall be appropriate for
the application, brushed aluminum, brushed nickel, stainless steel, or
manufacturer’s standard plastic covers. |
|
|
5. |
Provide unit with visible setpoint adjustment,
space temperature indication and optional membrane touch pad control. |
|
B. |
Duct
Mounted, Insertion or Outside Temperature Sensors: |
|
|
1. |
Manufacturers: Automation Components Inc or
approved equal |
|
|
2. |
Platinum RTD type, with the
following minimum performance:
Temperature Coefficient:
.00385 or .00375 ohm/ohm/°C
Accuracy:
± .12% at 32°F
Conformance:
DIN-IEC 751
Operating Range:
-50 to 170°F
0 to 99% RH |
|
|
3. |
Install insertion sensors in stainless steel
probes or stainless steel/brass thermowells.
Duct sensors shall be averaging type for large ducts with a cross
section area 9 sq ft or larger. Or single point probes for smaller ducts.
Outside air sensors shall be weatherproof of non-corrosive
construction and protected with solar shield. |
|
|
4. |
Thermistors will be acceptable in lieu of RTD
provided thermistor carries 5 year guarantee that the device will maintain
its accuracy within a tolerance of ± 0.36°F
between 32°F and 150°F
and ± 0.5°F between
-20°F and 212°F. |
|
C. |
Direct
Insertion Temperature Sensors: |
|
|
1. |
Manufacturers: Automation Components Inc or
approved equal |
|
|
2. |
Sensor assembly shall be direct insertion,
suitable for use with water systems, 150 pound class, minimum rating. |
|
|
3. |
Sensor shall be platinum
RTD, minimum accuracy of ± 0.06% at 32°F. |
|
|
4. |
Sheath diameter shall not exceed 5/16".
Length shall be such that sheath, containing sensor, projects into
process fluid from 2" to 2.5" beyond pipe wall when installed.
Material to be 304 or 316 stainless steel.
Process coupling to be 1/2" NPT. |
|
|
5. |
Provide internal termination for RTD and wire
connection. Conduit
connection shall be 1/2" NPT. |
|
|
6. |
Thermistors
will be acceptable in lieu of RTD provided thermistor carries 5 year
guarantee that the device will maintain its accuracy within a tolerance of
± 0.36°F between 32°F
and 150°F and ± 0.5°F between
-20°F and 212°F. |
|
D. |
RTD
Temperature Transmitters: |
|
|
1. |
Manufacturers: Automation Components Inc or
approved equal |
|
|
2. |
Provide temperature transmitters where
controller input cannot accept temperature sensors directly or where
distance between the sensor and the controller is excessive. |
|
|
3. |
Transmitters shall provide 2-wire 4-20 mA
current output signal proportional to specified temperature span of
transmitter and compatible with DDC equipment.
Power Supply Voltage: 8 to 35
VDC unregulated.
Accuracy or Output Error: 0.1%
of span of sensor and transmitter combination. |
|
|
|
Provide local temperature indicator where
indicated on drawings with LCD digital readout. |
|
E. |
Low
Temperature Sensors: |
|
|
1. |
Manufacturers: Automation Components Inc or
approved equal |
|
|
2. |
Platinum RTD type, with the
following minimum performance:
Temperature Coefficient:
.00385 or .00375ohm/ohm/°C
Accuracy:
± .3C at 0 C
Conformance:
DIN-IEC 751
Operating Range:
-328 to 392°F
-200 to 150C
Standard:
DIN-IEC-751
Output Signal:
4-20mA or Resistive
Probes:
316 SS |
|
|
3. |
Sensors are to be available for low temperature
applications example
Freezers, Refrigerators, Laboratories, etc. |
|
|
4. |
These sensors shall be configurable in duct,
Immersion and remote probes. The sensors will come with a strain-free
element to allow for expansion and contraction. Sensors
shall be made available with two or three wire configurations depending on
exact application. |
|
F. |
High
Temperature Sensors: |
|
|
1. |
Manufacturers: Automation Components Inc or
approved equal |
|
|
2. |
Platinum RTD type, with the
following minimum performance:
Temperature Coefficient:
.00385 or .00375 ohm/ohm/°C
Accuracy:
± .3C at 0 C
Conformance:
DIN-IEC 751
Operating Range:
-40 to 842°F
-40 to 450C
Standard:
DIN-IEC-751
Output Signal:
4-20mA or Resistive
Probes:
316 SS |
|
|
3. |
Sensors are to be available for low temperature
applications example Boilers, Stacks, Process Controls, Ovens, Incubators,
Truck or Vehicle Engines etc. Sensors
shall be made available with two or three wire configurations depending on
exact application. |
|
|
4. |
These sensors shall be configurable in duct,
Immersion and remote probes. The sensors will be air encapsulated to allow
for a much more stable output, the sensing element is not subjected to the
constant expansion and
contraction. |
|
G. |
Space
Humidity Sensors/Transmitters: |
|
|
1. |
Manufacturers:
Automation Components Inc, or
approved equal. |
|
|
2. |
Space humidity sensors shall be wall mount type
with standard manufacturer’s plastic cover to match room temperature
sensors. |
|
|
3. |
Sensing element shall be resistive bulk polymer
type and transmitter shall have field adjustable capabilities.
Sensor/transmitter shall have the following minimum performance.
Accuracy:
±2,3,5% RH at 25°C
over 20-95% RH including hysteresis, linearity and repeatability.
1% over 20% span between 20-95%
Temperature Effect:
Less than 0.06% per °F at
baseline of 68°F.
Sensitivity:
0.1% RH.
Repeatability:
0.5% RH.
Hysteresis:
Less than 1%.
Long Term Stability:
Less than 2% RH drift per 5 years.
Adjustment:
± 20% RH zero,
non-interactive.
± 10% RH span, non-interactive.
Operating Range:
0-99% RH, non-condensing, sensor.
0-100%RH,non-condensing, electronics.
Output:
4-20 mA, 0-100% linear, proportional
0-5,0-10VDC
Power:
15-36 VDC/24 VAC
Operating Temp Range: 0 deg C to 50 deg C (32F to 122F)
Display: Optional |
|
H. |
Duct
Mounted Humidity Sensors/Transmitters: |
|
|
1. |
Manufacturers:
Automation Components Inc, or
approved equal. |
|
|
2. |
Probe type, temperature compensated, field
adjustable, resistive bulk polymer type.
Sensor/transmitter shall have the following minimum performance.
Accuracy: ±2,3,5% RH at 25°C
over 20-95% RH including hysteresis, linearity and repeatability.1%
over 20% span between 20-95%
Temperature Effect: Less than 0.06%
per °F at baseline of 77°F.
Sensitivity: 0.1% RH.
Repeatability: 0.5% RH.
Hysteresis: Less than 1%.
Long Term Stability: Less
than 2% drift per 5 years.
Adjustment: ± 20% RH zero,
non-interactive. ± 10% RH span, non-interactive.
Operating Range: 0-99% RH,
non-condensing, sensor. 0-100%RH,non-condensing, electronics.
Output: 4-20 mA, 0-100%
linear, proportional 0-5,0-10VDC
Power: 15-36 VDC/24 VAC
Operating Temp Range:0 deg C to 50 deg C (32F to 122F) |
|
I.
|
Differential
Pressure Transmitters Wet to Wet: |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal. |
|
|
2. |
Shall have both unidirectional and
bidirectional pressure ranges and available for applications with line
pressure up to 250 psig. Gases and liquids will be compatible with series
300 and 17-4PH stainless steel and viton. |
|
|
3. |
Unit
shall be capable of transmitting linear 4 to 20 mA,0 to 5 or 0 to 10 VDC
output signal. The sensor
shall be of capacitance type and be housed in a nema 4/IP65 rated
enclosure. This unit shall have following minimum performance and
application criteria:
Temp operating range:
0 to 175F
Accuracy:
± .25% of full scale
output
Proof Pressure:
0-50 psid and 0-100 psid
Maximum working Pressure: 250 psig
Pressure Fittings:
¼” – 18 NPT internal
Repeatability:
Within 0.5% of output
Response:
30 to 50 milliseconds
Differential pressure transmitter will have an optional 3-valve manifold
for servicing. |
|
J. |
Ducted
Air System Static Pressure and Differential Pressure (Velocity)
Transmitters: |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal. |
|
|
2. |
Provide transducers/transmitters to convert
velocity, differential or static duct pressure relative to sensor location
into electronic signal. |
|
|
3. |
Unit shall be capable of
transmitting linear 4 to 20 mA DC output signal proportional to the
differential (total minus static or static minus ambient) pressure input
signals with the following minimum performance and application criteria:
Span:
Not greater than twice the duct static or velocity pressure at
maximum flow rate, nor more than 16 times velocity pressure at minimum
flow rate.
Accuracy:
± 1.0% of span or ± 1.0% of full scale
Dead
Band: Less than 0.5% of output
Hysteresis:
Within 0.5% of span or within 0.5% of full scale
Linearity:
Within 1.0% of span or within 0.5% of full scale
Repeatability:
Within 0.5% of output
Response:
Less than 1 second for full span input. |
|
K. |
Industrial
Grade Gage Pressure Transmitter: |
|
|
1. |
Manufacturers:
Automation Components Inc or approved equal. |
|
|
2. |
Pressure sensor and integral 4-20 mA VDC
transmitter. Select instrument for intended usage, range, maximum
pressure/temperature. Sensor shall be capacitance
type. |
|
|
3. |
This
unit will have both RFI and Polarity Protection.
Diaphragm Material: Stainless
Steel or Hastelloy
Process Connection: ¼” NPT
Power Supply Voltage: 12 - 30 VDC
unregulated
Over Pressure: 2 times maximum
operating pressure which ever is greater.
Performance:
Accuracy: ± 0.25% of calibrated
span, including effects of linearity, hysteresis, repeatability dead band.
Stability: ± 0.5% Full Scale/Year
Operating Temperature: -40F
to 260F(-40C to 127C)P
Pressure Ranges:
0-1000 psig ( Factory set for ranges in between)
|
|
L. |
Pressure
(E-P) Transducers: |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal |
|
|
2. |
Provide pressure transducers
integral to DDC panels or separate components to convert digital analog
signal to variable pneumatic air pressure signal. These units shall have
gauge options available. Units to have following characteristics:
Supply Voltage
Regulated 22.8 to 27.6 VDC
Regulated 21.6 to 26.4 VAC
Input:
4-20 mA or 0-5, 0-10 VDC
Output: 0-15 psi or 0-20 psi max
Accuracy:
Less than or equal to 3% Full Scale |
|
M. |
Carbon
Monoxide Monitor (Room or Duct): |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal |
|
|
2. |
Provide Carbon Monoxide Monitor as listed below.
The system shall be a complete package with integral sensor,
monitor, alarm contacts. Status indicator lights for power and status of
sensor are optional. Device
shall be housed in Nema 1 or
Nema 4X enclosure. All status
indicators shall be mounted within enclosure. Also units must meet OSHA
and UL2075 rating standards. Must be capable of measuring other specific
gas as mentioned below. |
|
|
3. |
Unit shall have adjustable setpoints and self-test
diagnostics.
Gas
to be Detected: Carbon Monoxide
(CO)
Power
Requirements: 24 VDC or 24 VAC
Accuracy:
2.5% of reading
Signal
Output: 4-20 mA, or 2-10 VDC Linear
Digital, RS-485
Relay & Buzzer:
Two, Single pole double throw(SPDT)
Form C, 1 amp dry contact
Factory
Set Ranges: O2
0 to 25% v/v
NO2 0 to 6 ppm
CO 0 to
125 ppm
NO 0
to 100 ppm
NH3 0 to
50 ppm
Remote
Sensor: Electrochemical
Sensor
Life: 2
to 3 year nominal service
Warranty:
2-year warranty |
|
N. |
Air
Quality Monitor (Room or Duct): |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal |
|
|
2. |
Provide IAQ Monitor as listed below. The system
shall be a complete package with intergral sensor. Device shall be housed
in a plastic enclosure. |
|
|
3. |
Unit shall have selectable outputs of 4-20mA or 0-10 VDC.
Gas
to be Detected: CO2 or Combined
CO2+VOC’s
Power
Requirements: 12 to 30
VDC
Integral
Sensor: Photoacoustic Sensor
Accuracy:
Repeatability:
± 2% Full Scale
Drift:
± 5% Full Scale /year
Range:
0-2000 CO2 or 0-2000
ppm IAQ (CO2 + VOC’s). |
|
O.
|
Carbon
Dioxide Monitor (Room or Duct): |
|
|
1. |
Manufacturers: Automation Components Inc. or
approved equal |
|
|
2. |
Provide Carbon Dioxide Monitor as listed below.
The system shall be a single point type gas detection monitoring
system and shall detect carbon dioxide at adjustable detection levels.
Sensor shall be calibrated for carbon dioxide gas. System shall have a
warm up time of 4 minutes or less. System alarm outputs shall have two
adjustable alarm points each having contact closures. |
|
|
3. |
This unit shall have self calibration features
on board as well as a elevation (pressure) correction option. System shall
not require periodic maintenance beyond normal calibration checks with
known gas sample. |
|
|
4. |
Temperature sensing to be optional and shall have a
resistive signal to the control system
Performance:
Gas
to be Detected: Carbon
Dioxide (CO2)
Power
Requirements: 18 to
30 VAC/ 18 to 42 VDC
Sensor
Type: Infrared Optical
Diffusion
Analog
Output: 4-20 mA, 0-10 VDC
Alarm
Relays: 2
Relays, Contacts Ratings 2 amp NO or
NC contacts
Operating
Temp: 60
to 90F (15 to 32C).
Ranges:
0-2000 ppm Factory set, adjustable to
10,000 ppm
Response
Time: 0
to 90% Less than 1 minute
Relative
Humidity: 0
to 95% non-condensing
Accuracy:
±
75 ppm or 7% of reading
Calibration:
5-year calibration guarantee
Display:
Room display is optional, Duct mount the display is a standard
feature
Warranty:
18 months parts and labor |
|
|
5. |
Mount monitor on 2” x 4” vertical junction
box 5 feet above floor. |
|
PART 3 - EXECUTION |
| 3.1
|
GENERAL |
|
A.
|
Install control equipment, wiring
and air piping in neat and workmanlike manner to satisfaction of Architect
and/or Engineer, and in accordance with manufacturer's recommendations.
Maintain clearances, straight length distances, etc. required for proper
operation of each device. Mark and detail exact location of inline
devices, wells, and taps to be installed by Mechanical Contractor on
coordination drawings. |
|
B.
|
Coordinate timely delivery of
materials and supervise activities of other trade contractors to install
inline devices such as immersion wells, pressure tappings, any associated
shut-off valves, flow switches, level switches, flow meters, air flow
stations, and other such items furnished by Control Contractor which are
to be installed by Mechanical Contractor. |
|
C.
|
Install control devices in
accessible location. |
|
D. |
Mount motor control devices within
5 ft of disconnect switch, or starting device furnished by Electrical
Contractor unless noted otherwise. Maintain
required NEC clearances. |
| 3.2
|
GENERAL INSTRUMENTATION |
|
A. |
Pressure Gauges (Pressure
Indicators): |
|
|
1. |
Refer to Section |
|
B.
|
Thermometers (Temperature
Indicators): |
|
|
1. |
Refer to Section |
| 3.3
|
Local Control Panels: |
|
|
1.
|
Install remote mounted devices, controllers,
I/O terminal blocks, power supplies, etc. inside of local control panels. |
|
|
2. |
Locate panels adjacent to equipment served with
minimum of 3-foot clearance in front of door.
Provide sufficient clearances to allow full door swing and full
access to internal components. Submit
proposed panel locations with shop drawings. |
|
|
3. |
Mount top of panel between 5 and 6 ft above
floor so that gauges and indicators are at eye level. |
| 3.4
|
DISCRETE AND ANALOG INSTRUMENTATION |
|
A.
|
Wall Mounted Space
Thermostats/Sensors: |
|
|
1. |
Install space thermostats/sensors where
indicated, as required to perform specified controls, or directed to meet
job site conditions. Provide
space thermostats/sensors as required, if not shown on drawings, but
required to perform temperature control per control sequences. |
|
|
2. |
Mount space thermostats/sensors with accessible
setpoint adjustment or temperature reading (thermometer or digital
temperature readout) at 4 ft above floor. |
|
|
3. |
Any space thermostats/sensors mounted on
exterior walls shall be mounted on thermally insulated sub-base. |
|
|
4. |
Relocate space thermostats/sensors if required
due to draft, interference with cabinets, chalkboards, etc., or improper
sensing. |
|
B.
|
RTD Temperature Transmitters: |
|
|
1. |
Provide RTD temperature transmitters whenever
DDCPs cannot receive RTD type inputs. |
|
C. |
Low Limit Temperature Switches (Freezestats): |
|
|
1. |
Install low limit controls where indicated on
drawings or as specified. Unless
otherwise indicated, install sensing element at downstream side of heating
coils. |
|
|
2. |
Install
sensing element in a horizontal spiral manner with not more than 12 inches
between the horizontal sensing tube runs.
Mount sensing tubing not more than 6 inches from the top and bottom
of the coil and extending to the sides of the coil.
Sensing tube not to be installed in a straight horizontal or
diagonal mounting. |
|
|
3. |
Mount switch housing with reset button as close
as possible to the air handling unit compartment door.
Where switch cannot be mounted within 3 feet of compartment door,
use automatic reset buttons mounted on air handling unit exterior wall
near compartment door. |
|
D.
|
Static Pressure and Air Flow
Stations: |
|
|
1. |
Furnish
static pressure and airflow measuring stations to Mechanical Contractor
for installation. |
|
|
2. |
Stations shall be installed in strict
accordance with manufacturer's published requirements.
These stations serve as primary signals for airflow control
systems, therefore it shall be responsibility of Control Contractor to
verify location and installation to assure that accurate primary signals
are obtained. |
|
|
3. |
Pressure differential switches shall be piped
across device creating differential between fan discharge and fan suction. |
|
E. |
Direct Insertion Temperature
Sensors: |
|
|
1. |
Install sensor so that sensor is pointed down
stream. |
|
F. |
Steam Flow Meters: |
|
|
1. |
Install flow measuring devices with recommended
straight pipe diameters upstream and downstream of elbows, tees, valves,
or other fittings that cause uneven turbulent flow conditions. |
|
|
2. |
If no recommendations are given, provide
straight pipe equal to 10 pipe diameters upstream and 5 pipe diameters
downstream. |
|
G. |
Sensor Wells: |
|
|
1.
|
Mount sensor wells as shown on drawings and
other gravity return as required by other Contract documents. Wells mounted in pipe 3" and larger may be installed in
horizontal or vertical lines provided element is always in the flow, (for
condensate and other gravity return lines, install in bottom of pipe).
Wells mounted in pipe 2-1/2" and smaller shall be installed at
elbow tee fittings with well pointed upstream.
Minimum of 2" pipe size for elbow tee installation. |
|
H. |
Transmitters and Indicators: |
|
|
1. |
Locate transmitters at sensing device or within
100 ft for remote mounted transmitters.
For hot systems (150°F and
higher) mount electronics on side of pipe or remotely mount.
For indicating type instruments, locate indicating element within 6
feet of the floor with readout easily visible from floor level. Provide
remote readouts if necessary. |
| END OF SECTION |
