INSTALLATION AND MAINTENANCE INSTRUCTIONS
WARNING
Pittway Tecnologica Srl,
DNRE Duct Smoke Detector
SPECIFICATIONS
Operating Temperature: –20° to 60° C
Storage Temperature: –30° to 60° C
Humidity: 0% to 93% Relative Humidity Non-condensing
Air Velocity: 1.5 to 20.3 m/sec.
Rectangular Footprint Dimensions: 37 cm L × 12.7 cm W × 6.36 cm D
Square Footprint Dimensions: 19.7 cm L × 22.9 cm W × 6.35 cm D
Weight: 0.73 kg
Electrical (See applicable detector head installation manual for electrical specifications. Use the Base/Sensor Cross Reference chart at http:\\www.systemsensor.com
to determine applicable sensor head.)
ACCESSORY CURRENT LOADS AT 24 VDC
Table of Contents Page
[1] Limitations of Duct Smoke Detectors .........................1
[2] General Description .....................................1
[3] Contents of the Duct Smoke Detector Kit ......................1
[4] Detector Installation .....................................1
[5] Sampling Tube Installation ................................2
[6] Measurement Tests ......................................3
[7] Field Wiring ...........................................4
[8] Verification of Operation ..................................4
[9] Dectector Cleaning Procedures .............................5
[10] Sensor Replacement ....................................5
[11] Optional Accessories ....................................5
Warranty .............................................6
BEFORE INSTALLING
Read the System Sensor Guide for Proper Use of Smoke Detectors in Duct Applications (A05-1004), which provides detailed information on detector spacing,
placement, zoning, wiring, and special applications. Copies of this manual are
available online at www.systemsensor.com. Reference must be made to local
fire regulations.
NOTICE: This manual shall be left with the owner/user of this equipment.
IMPORTANT: This detector must be tested and maintained regularly. The
detector must be tested an maintained regularly following NFPA 72 requirements. According to NFPA, the detector should be visually inspected semiannually and functionally tested at least once a year. This may need to be more
frequent depending on the air quality of the duct supply air.
[1]LIMITATIONS OF DUCT SMOKE DETECTORS
DUCT DETECTORS MUST NOT BE USED AS A SUBSTITUTE FOR OPEN AREA
DETECTOR PROTECTION as a means of providing life safety. Nor are they a
substitute for early warning in a building’s regular fire detection system.
This device will not operate without electrical power. Fire situations may
cause an interruption of power. The system safeguards should be discussed
with your local fire protection specialist.
This device will not sense smoke unless the ventilation system is operating
and the cover is installed.
For this detector to function properly, it MUST be installed according to the
instructions in this manual. Furthermore, the detector MUST be operated within
ALL electrical and environmental specifications listed in this manual and the
sensor head installation manual. Failure to comply with these requirements may
prevent the detector from activating when smoke is present in the air duct.
DEVICE STANDBY ALARM
RA400Z/RA100Z 0mA 12mA Max.
RTS451/RTS151 0mA 12mA Max.
RTS451KEY/RTS151KEY 12mA 12mA Max.
6500RTS-KEY 12mA 12mA Max.
[2]GENERAL DESCRIPTION
Smoke introduced into this air duct system will be distributed throughout the
entire building. Smoke detectors designed for use in air duct systems are used
to sense the presence of smoke in the duct.
Model DNRE Air Duct Smoke Detector utilizes photoelectric technology for
the detection of smoke. This detection method, when combined with an efficient housing design, samples air passing through the duct and allows detection of a developing hazardous condition. When sufficient smoke is sensed,
an alarm signal is initiated at the fire control panel monitoring the detector,
and appropriate action can be taken to shut off fans, blowers, change over air
handling systems, etc. These actions can facilitate the management of toxic
smoke and fire gases throughout the areas served by the duct system.
The DNRE incorporates a sensor cover tamper feature that provides a trouble signal at the panel immediately if the cover is removed or improperly installed. Proper installation of the sensor cover removes the trouble condition.
When programmed with the system control panel, two LEDs on each duct
smoke detector light to provide local visible indication.
The DNRE provides a remote alarm output for use with auxiliary devices, such
as the RA400Z/RA100Z remote LED annunciator, as well as remote test capability with the RTS451/RTS151 or RTS451KEY/RTS151KEY Remote Test Stations.
[2.1] DETECTOR FEATURE SET
– Utilizes plug-in head
– Sampling tubes install from front and rear
– Compatible with existing accessories
– Able to address detector per code switches on sensor head.
[3]CONTENTS OF THE DUCT SMOKE DETECTOR KIT
1. Sensor/power side and covers (use appropriate sensor per the system
control panel)
2. Three #10 sheet metal screws for mounting
3. One test magnet
4. Drilling template
5. One sampling tube end cap
6. One plastic exhaust tube
NOTE: A DST sampling tube must be ordered to complete the installation. It
must be the correct length for the width of the duct where it will be installed. See
Table 1 on page 3 to determine the inlet tube required for different duct widths.
[4]DETECTOR INSTALLATION
[4.1]VERIFY DUCT AIR FLOW DIRECTION AND VELOCITY
Model DNRE detectors are designed to be used in air handling systems having air velocities of 1.5 to 20.3 m/sec per minute. Duct widths from 15.3 to
30.5 cm can be accommodated. Be sure to check engineering specifications to
ensure that the air velocity in the duct falls within these parameters. If necessary, use a velocity meter (anemometer) to check the air velocity in the duct.
Via Caboto 19/3, 34147 Trieste, Italy
www.systemsensoreurope.com
I56-3538-003R
SS-300-021 1 I56-3538-003R
REMOVE SCREW AND PIVOT
REPLACE SCREW
FIGURE 1. EXPLODED VIEW OF DUCT SMOKE DETECTOR COMPONENTS:
EXHAUST TUBE
SAMPLING
TUBE
SOLD
SEPERATELY
SENSOR MODULE
SENSOR HEAD
WIRING COMPARTMENT
WIRING COMPARTMENT COVER
[4.2]DETERMINE MOUNTING LOCATION AND CONFIGURATION
On ducts wider than 45.7 cm it is recommended that the detector be mounted
downstream of a bend, obstruction in the duct, or the supply or return air
inlet.
Exception: Installation of duct detectors can be on or within a commercial
packaged rooftop heating and air-conditioning system, fire/smoke dampers
and economizers. They may be mounted in either the supply and/or return
air section as determined by local code.
Once a suitable location is selected, determine if the detector is to be mounted
in a side-by-side “rectangular” configuration or a top-over-bottom “square”
configuration as shown in Figure 2. If mounting in the square configuration,
remove the rear attachment screw, rotate the unit at hinge, and replace the
screw into the new attachment hole as shown in Figure 2. Do NOT remove
the hinge screw during this process. Final installation approval shall be based
upon passing differential pressure and smoke entry tests described in the
Measurement Tests section.
FIGURE 2:
DETECTOR AS SHOWN BELOW.
TO SECURE DETECTOR
IN PLACE.
[4.3]DRILL THE MOUNTING HOLES
Remove the paper backing from the mounting template supplied. Affix the
template to the duct at the desired mounting location. Make sure the template
lies flat and smooth on the duct.
H0550-00
SENSOR MODULE COVER
H0569-08
[4.3.1]FOR RECTANGULAR SIDE-BY-SIDE MOUNTING CONFIGURATION:
Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “B” for
the rectangular configuration mounting tabs as shown on mounting template.
Drill pilot holes at target “A” centers and cut two 3.5 cm diameter holes using
a 3.5 cm hole saw or punch. Drill 4 mm inch diameter holes using a 4 mm
drill at target “B” centers.
[4.3.2]FOR SQUARE TOP-OVER-BOTTOM MOUNTING CONFIGURATION:
Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “C” for
the square configuration mounting tabs as shown on mounting template. Drill
pilot holes at target “A” centers and cut two 3.5 cm diameter holes using a 3.5
cm hole saw or punch. Drill 4 mm diameter holes using a 4mm drill at target
“C” centers. If desired, drill an additional 4 mm hole at the location of one of
the mounting tabs on the lower housing.
[4.4]SECURE THE DUCT DETECTOR TO THE DUCT
Use two (rectangular configuration) or three (square configuration) of the provided sheet metal screws to screw the duct detector to the duct.
CAUTION: Do not overtighten the screws.
[5]SAMPLING TUBE INSTALLATION
[5.1]SAMPLING TUBE SELECTION
The sampling tube must be purchased separately. Order the correct length,
as specified in Table 1, for width of the duct where it will be installed. The
sampling tube length must extend at least 2/3 across the duct width for optimal
performance.
The sampling tube is always installed with the air inlet holes facing into the
air flow. To assist proper installation, the tube’s connector is marked with an
arrow. Make sure the sampling tube is mounted so that the arrow points into
the airflow as shown in Figure 3. Mounting the detector housing in a vertical
orientation is acceptable provided that the air flows directly into the sam
pling tube holes as indicated in Figure 3. The sampling tube and exhaust tube
can be mounted in either housing connection as long as the exhaust tube is
mounted downstream from the sampling tube.
SS-300-021 2 I56-3538-003R
TEST COIL TERMINALS
[6.2]LOW FLOW AIR FLOW TEST USING DWYER SERIES 607
BREAKAWAY STOP
CAUTION
+ RA
DIFFERENTIAL PRESSURE TRANSMITTER
Verify the air speed of the duct using an anemometer. Air speed must be at
least 1.5 m/sec. Wire the transmitter as shown in Figure 5. Connect the leads
of the meter to either side of the 1000Ω resistor. Allow unit to warm up for
15 seconds. With both HIGH and LOW pressure ports open to ambient air,
measure and record the voltage drop across the 1000Ω resistor (measurement
1), 4.00 volts is typical. Using flexible tubing and rubber stoppers, connect the
HIGH side of the transmitter to the sampling tube of the duct smoke detector housing, and the LOW side of the transmitter to the exhaust tube of the
duct smoke detector housing. Measure and record the voltage drop across the
1000Ω resistor (measurement 2). Subtract the voltage recorded in measurement 1 from the voltage recorded in measurement 2. If the difference is greater
than 0.15 volts, there is enough air flow through the duct smoke detector for
proper operation.
[7]FIELD WIRING; INSTALLATION GUIDELINES
All wiring must be installed in compliance with local wiring regulations.
Proper wire gauges should be used. The conductors used to connect smoke
detectors to control panels and accessory devices should be color-coded to
prevent wiring mistakes. Improper connections can prevent a system from
responding properly in the event of a fire.
For signal wiring (the wiring between detectors or from detector to auxiliary
devices), it is usually recommended that single conductor wire be no smaller
than 18 gauge. The duct smoke detector terminals accommodate wire sizes up
to 12 gauge. Flexible conduit is recommended for the last 30 cm of conduit;
solid conduit connections may be used if desired.
Duct smoke detectors and alarm system control panels have specifications for
Signaling Line Circuit (SLC) wiring. Consult the control panel manufacturer’s
specifications for wiring requirements before wiring the detector loop.
[7.1]WIRING INSTRUCTIONS
Disconnect power from the communication line before installing the DNRE
duct smoke detector.
The DNRE detectors are designed for easy wiring. The housing provides a terminal strip with clamping plates. Wiring connections are made by sliding the
bare end under the plate, and tightening the clamping plate screw. See Figure
6 on below for system wiring.
FIGURE 6. SYSTEM WIRING DIAGRAM FOR DNRE:
[7.2] SET THE ADDRESS
Set the desired address on the sensor head code wheel switches. on the back
of the sensor head.
FIGURE 7. ROTARY ADDRESS SWITCHES
HO112-03
Note: Some panels support extended addressing. In order to set the sensor
above the address number 99 on compatible systems, carefully remove the
stop on the left hand rotary switch with pliers as shown in Figure 7.
NOTE: Verify sensor cover gasket is properly seated on cover prior to cover
installation
[8] VERIFICATION OF OPERATION
[8.1]INSTALL THE COVER
Install the covers making sure that the cover fits into the base groove. Tighten
the seven screws that are captured in the covers. Note that the cover must be
properly installed for proper operation of the sensor.
[8.2] POWER THE UNIT
Activate the communication line on terminals COM + and COM –.
[8.3] DETECTOR CHECK
Standby – If programmed by the system control panel, look for the presence of
the flashing LEDs through the transparent housing cover. The LED will flash
with each communication.
Trouble – If programmed by the system control panel and the detector LEDs
do not flash, then the detector lacks power (check wiring, missing or improperly placed cover, panel programming, or power supply), the sensor head is
missing (replace), or the unit is defective (return for repair).
[8.4]DUCT SMOKE DETECTOR TEST & MAINTENANCE PROCEDURES
Test and maintain duct smoke detectors in accordance with local fire regulations and practice. The tests contained in this manual were devised to assist
maintenance personnel in verification of proper detector operation.
Before conducting these tests, notify the proper authorities that the smoke
detection system will be temporarily out of service. Disable the zone or system
under test to prevent unwanted alarms.
[8.4.1]TEST THE UNIT
1. M02-04-00 Magnet Test – This sensor can be functionally tested with a
test magnet. The test magnet electronically simulates smoke in the sensing chamber, testing the sensor electronics and connections to the control
panel.
2. Remote Test Accessory – The use of a remote accessory for visible indica-
tion of power and alarm is recommended.
Verify system control panel alarm status and control panel execution of all
intended auxiliary functions (i.e. fan shutdown, damper control, etc.).
Two LEDs on the sensor are controlled by the panel to indicate sensor
status. Coded signals, transmitted from the panel, can cause the LEDs
to blink, latch on, or latch off. Refer to the control panel technical documentation for sensor LED operation and expected delay to alarm.
[8.4.2] THE DETECTOR MUST BE RESET BY THE SYSTEM CONTROL PANEL
[8.4.3]SMOKE ENTRY TEST USING AEROSOL SMOKE
This test is intended for low-flow systems (1.5-254 m/sec). If the air speed is
greater than 2.54 m/sec, use a conventional manometer to measure differential pressure between the sampling tubes, as described under Measurement
Tests on Page 3.
Drill a .63 cm hole 91.4 cm upstream from the duct smoke detector. With the
air handler on, measure the air velocity with an anemometer. Air speed must
be at least 1.5 m/sec. Spray aerosol smoke into the duct through the .63 cmhole for five seconds. Wait two minutes for the duct smoke detector to alarm.
If the duct smoke detector alarms, air is flowing through the detector. Remove
the duct smoke detector cover and blow out the residual aerosol smoke from
the chamber and reset the duct smoke detector at the panel. Use duct tape to
seal the aerosol smoke entry hole. Remember to replace the cover after the test
or the detector will not function properly.
Canned aerosol simulated smoke (canned smoke agent) formulas will vary by
manufacturer. Misuse or overuse to these products may have long term adverse
effects on the smoke detector. Consult the canned smoke agent manufacturer’s
published instructions for any further warnings or caution statements.
[9]DETECTOR CLEANING PROCEDURES
Notify the proper authorities that the smoke detector system is undergoing
maintenance, and that the system will temporarily be out of service. Disable
the zone or system undergoing maintenance to prevent unwanted alarms and
possible dispatch of the fire department.
[9.1]DETECTOR SENSOR
1. Remove the sensor to be cleaned from the system.
2. Refer to the relevant detector installation manual for cleaning instructions.
3. Reinstall the detector.
[9.2]REINSTALLATION
1. Reinstall the detector in its housing.
2. Restore system power.
3. Perform Detector Check.
4. Notify the proper authorities testing has been completed and the smoke
detector system is back in operation.
[10]SENSOR REPLACEMENT
1. Remove the sensor head by rotating counterclockwise.
2. Pull gently to remove it.
3. To replace the sensor head, align the mounting features and rotate clockwise into place.
[11] OPTIONAL ACCESSORIES
Optional accessories include RA400Z/RA100Z, RTS451/RTS151 and
RTS451KEY/RTS151KEY and 6500RTS-KEY.
NOTE: Ensure blue wire always remains connected to RA+ terminal.
FIGURE 8. WIRING DIAGRAM FOR DNRE TO RA400Z/RA100Z:
FIGURE 9. WIRING DIAGRAM FROM DNRE TO RTS451/RTS451KEY/
RTS151/RTS151KEY AND 6500RTS-KEY:
TEST COIL +
EXTERNAL
*
TEST COIL –
COMM +
OUT (CONV ONLY) +
COMM –
RA/RTS –
RA +
RTS +
NOTE: THE RTS451/151, RTS451/151KEY TEST COIL
CIRCUIT REQUIRES AN EXTERNAL 24 VDC POWER
SUPPLY.
NOTE: THE USE OF A REMOTE TEST STATION REQUIRES THE
INSTALLATION OF AN ACCESSORY COIL, PART NUMBER DCOIL.
(-) POWER (+)
SUPPLY
45
321
RTS451/151,
RTS451/151KEY
REMOTE TEST STATION
LED OPTION
1 PER UNIT
10mA CURRENT DRAW
TEST COIL OPTION
1 PER UNIT
95mA CURRENT DRAW
H0571-14
FIGURE 10. DNRE USING A TEST COIL
DCOIL
TEST COIL SCREW
[11] ADDITIONAL MODULE OPTION
The DNRE can also accommodate a relay or control module (sold separately)
within the power board side of the housing. The relay or control module must
be listed as compatible to the fire alarm control panel.
Physical Module Mounting
1) Remove the breakaway tabs at the four corners of the module
H0561-01
2) Locate the module at right most corner of the power board. The upper
left corner mounting hole of the module will align with a screw boss in
the housing.
3) Install a M4X0.7, 9.5 mm long thread forming screw at the screw boss location
Note: See the corresponding module Installation Instructions for general
description, control panel compatibility, wiring and ratings.
(+) COM LINE
TO REST OF SYSTEM
LOOP
+
COMM (+)
COMM (–)
(+) OUT
UNIT1
COMM (+)
COMM (–)
(–) COM LINE
LOOP
COMPATIBLE
–
CONTROL PANEL
SS-300-021 4 I56-3538-003R
TO REST OF SYSTEM
(+) OUT
UNIT 2
COMM (+)
COMM (–)
(+) OUT
UNIT 3
HO119-04
(+)
RA400Z/RA100Z
– RA
(-)
REMOTE ALARM LED
OPTION 1 PER UNIT
H0570-03
Note: If using a RA400Z, the tab should be broken for use with the intelligent duct smoke detector. If using RA100Z, ensure that jumper is removed.
The RTS451/RTS151/RTS451KEY/RTS151KEY Remote Test Station facilitates
test of the alarm capability of the duct smoke detector. These accessories provide the stimulus to initiate an alarm condition at the detector. The DNRE duct
smoke detector must be reset by the system control panel.
SS-300-021 5 I56-3538-003R
.5 cm
SAMPLING TUBE ENDCAP
TO SAMPLING TUBE
+–
Please refer to insert for the Limitations of Fire Alarm Systems
System Sensor warrants its enclosed product to be free from defects in materials and
workmanship under normal use and service for a period of three years from date of
manufacture. System Sensor makes no other express warranty for the enclosed product.
No agent, representative, dealer, or employee of the Company has the authority to in
crease or alter the obligations or limitations of this Warranty. The Company’s obligation
of this Warranty shall be limited to the replacement of any part of the product which is
found to be defective in materials or workmanship under normal use and service during
the three year period commencing with the date of manufacture. After obtaining a Return
Authorization number, send defective units to: Returns Department, RA #__________,
Pittway Tecnologica Srl, Via Caboto 19/3, 34147 Trieste, Italy.
THREE-YEAR LIMITED WARRANTY
Please include a note describing the malfunction and suspected cause of failure. The
Company shall not be obligated to replace units which are found to be defective because
of damage, unreasonable use, modifications, or alterations occurring after the date of
-
manufacture. In no case shall the Company be liable for any consequential or incidental
damages for breach of this or any other Warranty, expressed or implied whatsoever, even
if the loss or damage is caused by the Company’s negligence or fault. Some states do not
allow the exclusion or limitation of incidental or consequential damages, so the above
limitation or exclusion may not apply to you. This Warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
SS-300-021 6 I56-3538-003R
©2013 System Sensor
TABLE 1. SAMPLING TUBES RECOMMENDED FOR
FIGURE 4.
DIFFERENT DUCT WIDTHS:
Outside Duct Width Sampling Tube Recommended*
Up to 30.5 cm. DST1
.63 cm
30.5 cm
30.5 to 61 cm DST1.5
61 to 122 cm DST3
122 to 244 cm DST5
244 to 366 cm DST10 (2-piece)
2
*Must extend a minimum of
FIGURE 3. AIR DUCT DETECTOR SAMPLING TUBE:
⁄3 the duct width
1.9 cm
HOLE
DETECTOR
H0215-01
NOTE: Air currents inside the duct may cause excessive vibration, especially
when the longer sampling tubes are used. In these cases, a 7.6 cm floor flange
(available at most plumbing supply stores) may be used to fasten the sampling tube to the other side of the duct. When using the flange/connector
mounting technique, drill a 2.5 to 3.2 cm hole where the flange will be used
[5.3]MODIFICATIONS OF SAMPLING TUBES
There may be applications where duct widths are not what is specified for the
installation. In such cases, it is permissible to modify a sampling tube that is
ARROW MUST FACE
INTO AIR FLOW
AIR FLOW
DIRECTION
H0551-00
longer than necessary to span the duct width.
Use a 4.9 mm drill and add the appropriate number of holes so that the total
number of holes exposed to the air flow in the duct is 10 to 12. Space the additional holes as evenly as possible over the length of the tube.
CAUTION: The sampling tube end cap, included with the detector, is critical
to proper operation of the duct smoke detector. The end cap is needed to
create the proper air flow to the sensor of the duct smoke detector. Once any
sampling tube length adjustments are made, plug the end of the sampling
tube with the provided end cap.
A plastic exhaust tube is included with the unit to be installed if needed. Install into the housing connection that is downstream from the sampling tube
connection. The exhaust tube can be installed from the front of the detector
or the back. A longer 30.5 cm exhaust tube, model ETX, is available as an
accessory in cases where the molded exhaust tube does not extend at least 5
cm into the duct.
[5.2]SAMPLING TUBE INSTALLATION
1. For tubes shorter than the width of the duct, slide the sampling tube,
with installed end cap, into the housing connection that meets the airflow first. Position the tube so that the arrow points into the airflow as
shown in Figure 3. Sampling tubes over 91 cm long should be supported
at the end opposite of the duct detector. In ducts wider than 244 cm,
work must be performed inside the duct to couple the other section of
the sampling tube to the section already installed using the 1.3 cm conduit fitting supplied. Make sure that the holes on both sections of the air
inlet sampling tube are lined up and facing into the airflow.
2. For tubes longer than the width of the air duct, the tube should extend
out of the opposite side of the duct. Drill a 1.9 cm hole in the duct opposite the hole already cut for the sampling tube. Ensure that the sampling tube is angled downward from the duct smoke detector to allow for
moisture drainage away from the detector. The sampling tube should be
angled at least .63 cm downward for every 30.5 cm of duct width per Figure 4.There should be 10 to 12 holes spaced as evenly as possible across
CAUTION: This procedure should only be used as a temporary fix. It is not
intended as a permanent substitute for ordering the correct length tubes.
[5.4]REMOTE SAMPLING TUBE INSTALLATION
The detector arrangement can also incorporate the remote mounting of the
sampling tube and/or exhaust tube. In this case both the detector, sampling
tube and exhaust tube (if included) should be rigidly mounted to withstand
the pressure and vibrations caused by the air velocity. The location of the
detector’s sampling tube should be such that there is uniform airflow in the
cross section area.
Pressure differential across the sampling and exhaust ports in the detector housing shall be verified to be between .25 mm and 28.2 mm of water. Do so by
measuring the pressure difference between the inlet and outlet ports on the
detector housing using a manometer as described in the Measurement Tests
sectiont of this manual.
[6]MEASUREMENT TESTS
[6.1]AIR FLOW
The DNRE is designed to operate over an extended air speed range of 1.5 to
20.3 m/sec. To verify sufficient sampling of ducted air, turn the air handler on
and use a manometer to measure the differential pressure between the two
sampling tubes. The differential pressure should measure at least .25 mmof
water and no more than 28.2 mm of water. Because most commercially available manometers cannot accurately measure very low pressure differentials,
applications with less than 2.54 m/sec of duct air speed may require one of
the following: 1) the use of a current-sourcing pressure transmitter (2) the use
of aerosol smoke, see below for test descriptions.
FIGURE 5. PROCEDURE FOR VERIFYING AIR FLOW:
TO EXHAUST TUBE
the width of the duct. If there are more than 2 holes in the section of the
tube extending out of the duct, select a shorter tube using Table 1. Otherwise, trim the tube to leave approximately 2.5 to 5 cm extending outside
the duct. Plug the end with the end cap and tape closed any holes in the
protruding section of the tube. Be sure to seal the duct where the tube
protrudes.
HIGH
DIFFERENTIAL
PRESSURE
TRANSMITTER
LOW
1000 OHM 5%
1 WATT RESISTOR
VOLT METER
15 TO 36
VDC SUPPLY
9 VOLT
BATTERY
9 VOLT
BATTERY
9 VOLT
BATTERY
H0163-04
SS-300-021 3 I56-3538-003R
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