Fieldpiece SDMN6ester User Manual
Fieldpiece
Dual Port
Manometer
and Pressure
Switch Tester
OPERATOR'S
MANUAL
Model
SDMN6
Quick Start
1. Press for 1 second to turn on your SDMN6.
2. If necessary, press ZERO for 1 second to set the
ambient pressure of P1 and P2.
3. P1 will be displayed in inches of water column
(inWC.) P1-P2 will be displayed on lower line.
4. See sections below for details on testing pressure switches.
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Certifications
C-Tick (N22675)
CE
Description
Correct pressure switch operation is integral
to the safety of a furnace environment.
The SDMN6 is a dual-port manometer that
also accurately tests pressure switches by
simulating a draft with an internal pump.
Adjust the pump's speed to create a negative
pressure (vacuum). The red LED indicates when
the switch closes. View the closing/opening
pressures directly on the LCD.
The dual-port manometer measures ±60
inches of water column, high enough for gas
pressures.
Check building pressurization with static
pressure resolution of 0.01"WC. View P1-P2
in the bottom line of the display for checking
pressure dierentials.
Use the static pressure probes to check for
a pressure drop accross two points in a duct.
This is useful for evaluating a blower or nding
airow restrictions in the ductwork.
Display
Auto Power O
(APO) Enabled
Blinks When
Pump is ON
Leads Detect
Continuity
Solid: Readings Held
Blink: Auto-Capture Mode
Pump Speed Limit Reached
Low Battery
Controls
Hold for one second to toggle power.
Press to toggle backlight.
Hold for one second to zero
pressure of P1 and P2.
Select P1 or P2 on top display.
(Hold while powering ON to disable Auto-o.)
Real Time Pressure
Measurement of P1 or P2
(mbar, inWC,mmWC, or psi)
P1/P2 Mode: P1-P2
Test Mode: Shows when
you are Increasing (InC) or
Decreasing (dEC) pump speed.
Indicates Whether P1 or P2
is Shown on Top Display Line
HOLD the displayed measurements.
In TEST mode: press to activate auto-capture mode.
The pressure reading will automatically HOLD
when the pressure switch closes or opens.
Enter pressure switch TEST mode and start the
pump (allow warm up to nish). Press again
to stop the pump and return to P1/P2 mode.
In TEST mode, increase pump speed (InC) to increase
the induced vacuum. (Holding increases faster.)
01
Specications
Operating environment: 32°F to 118°F (0°C to 48°C) at <80% RH
Storage temperature: -4°F to 140°F (-20°C to 60°C), 0 to 80% RH
(with battery removed)
Power: 9V, NEDA 1604A, IEC 6LR61 9V alkaline battery.
Battery life (alkaline): 200 hours (manometer only, backlight o),
12 hours (pressure switch testing @ 27% pump speed, BL o,
approx -2.5"WC induced pressure w/o pump bleed accessory)
Auto power o (APO): 15 minutes
Low battery indication:
Units of Measure: inWC, mmWC, mbar, psi
Resolution: 0.01 inWC
Overrange: “OL” or “-OL” is displayed
Max Pressure: 900inWC (17.4psi) will damage sensors
Compatible media: Dry, non-corrosive gases
Pressure ports: 2 connectors (P1, P2)
for exible tubing (4.5mm to 8mm ID)
Pump port: 1 connector (PUMP)
for 5mm (~3/16 inch) ID exible tubing
Lead jacks: 2 banana plug jacks for testing open/close switch status
(continuity between terminals)
Accuracy: Stated accuracy at 0 to 50°C (32 to122°F): ±1.5% FS
Accuracy and ranges:
inWC: ±0.02 on 0.00 to ±2.00 (±1.5% FS on 2.00 to ±60.0);
mmWC: ±0.5 on 0.00 to ±51.0 (±1.5% FS on 51.0 to ±1500);
mbar: ±0.05 on 0.00 to ±5.00 (±1.5% FS on 5.00 to ±150.0);
psi: ±0.001 on 0.000 to ±0.07 (±1.5% FS on 0.07 to ±2.000)
06
WEEE
RoHS Compliant
02
Static Pressure
1. ZERO your SDMN6 while at ambient pressure
with any hoses/probes attached. This will zero
both P1 and P2. For measurements less than
2 inWC, take reading within 1 minute after
zeroing for best accuracy.
2. Use one hose (P1 or P2) to get the gauge pressure relative to the ambient or ZERO pressure.
3. Connect both hoses if you want to see relative pressure, P1 - P2. This is common when
evaluating equipment such as a blower.
0.05inWC
Blower
PUMPP1 P2
inWC
07
-0.03inWC
03
NOTE: Always use the static pressure probes if
checking static pressure of an airow stream.
NOTE: The red arrows on the probes should
point toward the airow stream.
>> AIRFLOW DIRECTION >>
4. You can press P1 / P2 to toggle the top display
between P1 and P2. Note: P1 - P2 is shown
in the bottom line of the LCD.
5. Press UNITS to select: inches of water column
(inWC), millimeters of water column (mmWC),
millibar (mBar), or pounds per square inch
(psi).
6. Your SDMN6 will turn o automatically after
15 minutes of inactivity if APO is shown.
To disable auto-power-o (APO) hold P1/P2
while turning on your SDMN6.
7. If you are in an environment where the temperature is noticeably changing while you are
taking your reading, it is advised that you disconnect the meter from the hoses and ZERO
it relative to ambient before each reading.
08
Select mbar, inWC, mmWC, or psi.
(Hold to check % battery remaining.)
04
05
Decrease pump speed (dEC) to decrease the induced
vacuum. (Holding decreases faster.)
Gas Pressure 1. See manufacturer's specication for target
inlet and outlet pressures.
2. Shut o main gas supply to furnace.
3. Shut o power to furnace equipment.
4. Zero your SDMN6 while at ambient pressure
with hoses attached.
5. Remove outlet pressure tap screw, and insert
the brass screw tting of the P1 hose into the
outlet pressure tap of the gas regulator.
NOTE: Some pressure taps have a 5/16" boss
instead of an insert screw. In this case, remove
the brass screw tting from the P1 hose and
connect the included 5/16" adapter tube.
Loosen the tap screw about 1 revolution, and
slide the tube over the boss (see illustration
at left). Make sure the tube is over the boss
enough to prevent leakage.
6. Put furnace into operation (i.e. turn on gas
and power to the furnace, call for heating, and
have furnace ignite as if running it in normal
operation).
7. P1 will show the pressure coming out of the
regulator.
8. If you suspect high or low inlet pressure into
the regulator, connect P1 to inlet tap and P2
to outlet tap to see the pressure drop across
the regulator.
10
Manifold
(5/16” to 3/16”)
Adapter Tube
Outlet Pressure
Tap Screw
Pressure Tap
09
Gas
Adapter
(5/16”)
Outlet
PUMPP1 P2
inWC
Smaller end (3/16”) of the adapter
connects to SDMN6 tubing. Remove
the installed brass screw tting
from tube so the adapter can be
inserted.
Inlet Pressure
Tap Screw
Inlet Pressure Tap
Pressure Switch Test
!
N.O.
COM
NEG
PUMPP1 P2
WARNING: Read "Pressure Switch Testing Safety
Info" section below prior to testing.
1. Connect leads (interchangeable) from the
SDMN6 to the N.O. (normally open) and COM
(common) terminals of the pressure switch.
2. Connect the 2 yellow hoses of the Y-splitter
to the P1 and PUMP ports of your SDMN6.
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3. ZERO your SDMN6 while at ambient pressure
with yellow hoses attached. For measurements less than 2 inWC, take reading within
1 minute after zeroing for best accuracy.
4. Press TEST to start the pump. A brief warm up
period ensues.
5. Now connect the white hose to the negative
side of the pressure switch. (Incorrect setup
will cause incorrect pressure measurements.)
6. Make sure the pressure switch is vertically
oriented, the same as it is on the equipment.
7. If the CLOSED LED is OFF, press to increase
the pump speed and induce a negative pressure on the switch. The CLOSED LED will light
when the pressure switch closes. Note the
closing pressure.
If the CLOSED LED is ON, press to slow the
pump and decrease the negative pressure on
the switch. The CLOSED LED turns o when
the switch opens. Note the opening pressure.
NOTE: For higher rated switches, you can hold
down or to accelerate/decelerate the
pump faster. Slow your acceleration as you
approach the switch's rated pressure.
NOTE: A pressure switch should open and close
within the manufacturer's tolerance rating of
the switch (typically ±10%).
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AUTO CAPTURE MODE
Press HOLD to automatically HOLD a closing
or opening pressure of a switch as you change
the speed of the pump. "HOLD" blinks until a
change in continuity is detected. Press HOLD
again to exit AUTO CAPTURE mode.
PUMP BLEED ACCESSORY
Most pressure switches have
a bleed port to help regulate the
pressure required to close and open
the switch.
Pressure switches rated around
-0.10inWC often don't have a bleed
port. You can insert the Pump Bleed
Accessory directly onto the PUMP
port to give the pump better control
of these low negative pressures.
Indications a pressure switch is out of
calibration, has a weak/bad diaphragm, or
a bad micro switch in the pressure switch:
• Closing/opening outside the manufacturer's
tolerance rating.
• CLOSED LED blinks rapidly.
• Dramatic uctuations of pressure readings.
13
To Yellow
Pump Hose
To Pump
Port
Checking the Diaphragm
If you have diculty maintaining the correct
pressure to open and close the switch the
diaphragm could be cracked.
Checking the Bleed Port
Pressure readings are greatly aected when
the hose to the pressure switch is pinched. If the
pressure does not change when you pinch the
hose on a pressure switch with a bleed port, the
bleed port could be blocked.
Examine the bleed port for signs of corrosion
or debris. Corrosion is a sign that the switch
has been exposed to excessive moisture and
diaphragm could be coated with debris.
Checking the Inducer
If the pressure created by the inducer
measures more than enough to close the
pressure switch, but the SDMN6 proves the
pressure switch to be good, the inducer may not
be providing enough airow to close the switch.
14
Adjustable Pressure
Switch Calibration
WARNING: Read "Pressure Switch Testing Safety
Info" section below prior to testing.
1. Follow steps 1-6 of "Pressure Switch Test".
7. Press / to adjust the pump speed until
displayed negative pressure is stable, within
±0.02 inWC of your target pressure.
8. Start with the switch closed. If the switch is
open, slowly loosen the adjustment screw
until the CLOSED LED turns on.
9. Open the switch by slowly tightening the
adjustment screw on the adjustable pressure
switch until the CLOSED LED turns o. The
adjustable pressure switch is now calibrated
to your target pressure.
NOTE: Stabilized pressures may slightly uctu-
ate after an adjustment. Be sure to adjust the
pump speed ( / ) as needed to maintain
the desired induced negative pressure.
NOTE: Dual-pressure switches only have one
spring and one diaphragm so it's only necessary to test the negative side.
15
Transducer Test
1. Connect the 2 yellow hoses of the Y-splitter
to the P1 and PUMP ports of your SDMN6.
2. Connect a volt meter to the transducer's
terminals.
3. ZERO your SDMN6 while at ambient pressure
with yellow hoses attached. For measurements less than 2 inWC, take reading within
1 minute after zeroing for best accuracy.
4. Press TEST to start the pump. A brief warm
up period ensues.
5. Now connect the white hose to the low side
of the transducer. (Incorrect setup will cause
incorrect pressure measurements.)
6. Press / to increase/decrease the pump
speed and resulting negative pressure. For
higher rated transducers, you can hold down
the button to get the pump up to speed
faster.
7. As you increase the negative pressure, the
voltage across the terminals will change
based on the transducer's rating. Compare
observed voltage to rated voltage to determine the health of the transducer.
16
Pressure Switch
Testing Safety Info
The pressure switch is a safety device that
prevents the furnace from running in an unsafe
condition. An unsafe condition can result in
injury, loss of property or even loss of life.
1. Before every use, check the SDMN6 and the
tubing for breaks or blockage. Check the tub-
ing for any moisture as well.
2. It is critical that the hoses going to P1 and the
switch are the same length.
3. Check for the presence of moisture in the
pressure switch before using the SDMN6. Do
not use the SDMN6 on a pressure switch that
has moisture in it. Moisture can damage the
SDMN6 and VOID the warranty. Check the
tubing for moisture build-up as well.
4. The SDMN6 is designed to produce a precise
amount of negative pressure. Always zero the
SDMN6 before testing a switch.
5. Fieldpiece is not responsible for incorrect
readings by faulty test equipment or un-
trained personnel.
6. In the interest of safety, the SDMN6 should
only be used by trained, competent profes-
sionals who understand the hazards and
17
consider the risks of working on and with
tools and equipment.
7. The pressure rating for the pressure switch is
either stamped on the pressure switch or on
a sticker attached to the pressure switch. Otherwise, contact the vendor or manufacturer of
the furnace to get that information.
8. An adjustable pressure switch must open at
the desired negative pressure to match the
one it is replacing.
9. Fieldpiece is not liable for any damages, injuries, or loss of life incurred by the misuse of
the SDMN6.
NOTE: Pressure switch ratings are noted by
“[pressure] PF”. This means that the circuit
opens when the switch senses its rated Pressure Fall. Example: A -0.40" WC PF rated
switch should open at a negative 0.40 inches
of water column. The pressure switch should
close and more importantly “open” within the
manufacturer’s tolerance rating.
! WARNINGS
Turn o power to furnace prior to testing
to avoid low voltage shorting.
18
Limited Warranty
This meter is warranted against defects in
material or workmanship for one year from
date of purchase. Fieldpiece will replace or
repair the defective unit, at its option, subject to
verication of the defect. This warranty does not
apply to defects resulting from abuse, neglect,
accident, unauthorized repair, alteration, or
unreasonable use of the instrument.
Any implied warranties arising from the sale of
a Fieldpiece product, including but not limited
to implied warranties of merchantability and
tness for a particular purpose, are limited to
the above. Fieldpiece shall not be liable for loss
of use of the instrument or other incidental or
consequential damages, expenses, or economic
loss, or for any claim of such damage, expenses,
or economic loss. State laws vary. The above
limitations or exclusions may not apply to you.
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For Service
In the USA, call Fieldpiece Instruments for
one-price-x-all out of warranty service pricing.
Send check or money order for the amount
quoted. Send the meter freight prepaid to
Fieldpiece Instruments. Send proof of date and
location of purchase for in-warranty service.
The meter will be repaired or replaced, at the
option of Fieldpiece, and returned via least
cost transportation. Outside of the USA, please
visit www.eldpiece.com for service contact
information.
For international customers, warranty for
products purchased outside of the U.S. should
be handled through local distributors.
www.fieldpiece.com
©Fieldpiece Instruments, Inc 2014; v14
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