User Manual

General
Accuracy: Stated accuracy at 0 to 50°C (32 to
122°F): ±1.5% FS
Battery: Single standard 9-volt battery, NEDA
1604, JIS 006P, IEC 6F22.
Battery Life: 200 hours with low battery indicator
on display.
Operating environment:
32ºF (0°C) to 122ºF (50°C)
Compatible Media: Dry, non-corrosive gases
Overrange: “OL” or “-OL” is displayed.
Auto-Off power: 15 minutes
Low Battery: symbol is displayed.
Dimensions: 180mm(~7 1/16”)(H) x 60mm(~2
3/8”)(W) x 30mm(~1 3/16”)(D)
Weight: approximately 195g including battery
Pressure
Pressure Ports: tube connectors for 5mm (~3/16
inch) I.D. flexible tubing
Units of Measure: inWC, mmWC, mbar, PSI
Resolution: 0.01 inch WC
Accuracy/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
RMA316 Manometer Adapter
Used for 5/16" pressure outlet ports.
1. Shut off main gas supply to furnace.
2. Move the gas valve switch to "OFF" position.
3. Use a 3/32" hex wrench to loosen the outlet
pressure tap screw. Rotate screw counter-
clockwise one revolution to open.
4. Connect the SDMN5 tubing to the smaller
(3/16") end of the adapter and the other (5/16")
end of the adapter into the of the adapter tube.
5. Slide the 5/16" adapter tube over the outlet
pressure boss (port) to seal. Overlap the pres-
sure boss by at least 3/8" to prevent leakage.
Warranty
The product is warranted to the original purchas-
er against defects in material or workmanship for a
period of one (1) year from the date of purchase.
During the warranty period, Fieldpiece Instruments
will, at its option, replace or repair the defective unit.
This warranty does not apply to defects resulting
from abuse, neglect, accident, unauthorized repair,
alteration, or unreasonable use of the instrument.
Any implied warranty arising out of the sale of
Fieldpiece's products including but not limited to
implied warranties of merchantability, and fitness for
purpose, are limited to the above. Fieldpiece shall
not be liable for incidental or consequential dam-
ages.
Service
Return any defective SDMN5 to Fieldpiece for
warranty service along with proof of purchase.
Contact Fieldpiece for out of warranty repair
charges.
PRESS FOR 1 SECOND
AUTO-OFF BATTERY
CHECK
Dual Port Differential
Manometer
Model: SDMN5
OPERATOR’S MANUAL
Description
The SDMN5 is a portable standalone dual port
manometer. The SDMN5 is capable of taking gas
pressure as well as static pressure. The SDMN5
comes in a rugged rubber boot. The SDMN5 also
has a zero adjust and a hold button to hold the cur-
rently displayed reading. The auto-power-off func-
tion conserves battery life, but can be disabled if
desired.
The SDMN5 will allow you to take gas pressure
up to ±60” (152cm) of WC. The SDMN5 will take dif-
ferential pressure readings and display the differ-
ence between P1 and P2 at all times in the lower
right corner of the LCD. The SDMN5 also has four
different measurement scales including inches of
water column, millimeters of water column, mBar
and PSI. Static pressure is possible with the reso-
lution to 0.01” of WC (0.1mmWC). Special purpose
static pressure instruments are on the market with
better accuracy and temperature compensation but
they typically cost many times more than the
SDMN5.
Operation
1. Zero SDMN5 by pressing the ZERO just before
taking the pressure readings, while at ambient
pressure. This will zero both P1 and P2. For
measurements less than 2inWC, take reading
within 1 minute after zeroing for best accuracy.
2. Connect a single hose to get the gauge pres-
sure relative to the ambient or ZERO pressure.
3. Connect both hoses if you want to see relative
pressure, P1 minus P2.
4. By pressing the P1 / P2 button you can change
between displaying P1 or P2, P1 - P2 is con-
stantly displayed in the lower right of the LCD.
5. Pressing the unit button makes it possible to
switch between the four measurement scales of
inches of water column (inWC), millimeters of
water column (mmWC), mBar, and PSI. The
scale being viewed is displayed on the right side
of the LCD.
6. To disable the auto-power-off hold the HOLD
button while turning the unit on. If the auto-
power-off is enabled (meter will turn off automat-
ically) an APO will appear on the display. If
Auto-power-off is disabled (meter will not turn off
on its own), then no designation will appear on
the LCD.
7. If you are in an environment where the tempera-
ture 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.
Checking Gas Pressure on a Regulator
1. Screw the brass fitting into the pressure port on
the regulator.
2. Put unit into operation (i.e. turn on the furnace
and have furnace ignite, as if running it in nor-
mal operation.)
3. This will give you the pressure coming out of the
regulator.
4. If you suspect high or low inlet pressure into the
regulator, the manometer can hook into the inlet
port in the same manner it can connect into the
outlet port. If you have a dual-port manometer,
you can check both the inlet and the outlet
simultaneously and see the pressure drop
across the regulator.
5. See manufacturer's specification for target inlet
and outlet pressure for a given regulator or
piece of combustion equipment.
Battery Check Function
Press and hold the UNIT button to display the
percentage of usable battery remaining. This
function can be used any time the meter on.
Field Calibration
Pressure:
By pressing the ZERO button, both the P1 and
P2 are zeroed to the pressure they are being
exposed to. For this reason the calibration
should be done when both P1 and P2 are dis-
connected from the hoses.
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
T2
P1
P1
P2
ZERO
HOLD UNIT
ON/OFF
P2
88.88
88.88
APO
88.88
88.88
inWC
mmWC
mbar
psi
HOLD
PRESS FOR 1 SECOND
AUTO-OFF BATTERY
CHECK
PRESS FOR 1 SECOND
AUTO-OFF BATTERY
CHECK
Gas pressure
measurement
Static pressure
across a blower
V15
Outlet Pressure
Tap Screw
Outlet
Pressure
Boss
Inlet Pressure
Tap Screw
Smaller end (3/16”) of the adapter
connects to SDMN5 tubing. Remove
the installed brass fitting from tube
so the adapter can be inserted.
Inlet Pressure
Boss
Adapter
(5/16” to 3/16”)
Adapter Tube
(5/16”)