Manometer
Accessory Head
Model: AMN2
OPERATOR’S MANUAL
Description
The AMN2 adds static pressure measurements
to the function of a gas pressure instrument, all for
the price of a low cost gas pressure measuring
meter. For gas pressure, the AMN2 measures up to
60 inches water column (“WC) with a resolution of
0.1 "WC when used with any Fieldpiece meter. For
static pressure measurements, which are much
lower than gas pressure, use the 0.01"WC resolution mode. Special purpose static pressure instruments are on the market with better accuracy and
temperature compensation, but they typically cost
much more than the AMN2.
Operation
1. Connect to COM and Volts jacks using
Fieldpiece test leads with removable probe tips.
For Fieldpiece “stick-style” meters, EHDL1, or
DL3, slide the head directly over the meter.
2. Select the mVDC range on the DMM.
3. On the AMN2, select 0.1 resolution for gas pres-
sure. For static pressure, typically below 2”WC,
select 0.01 resolution.
4. To zero the instrument, press the Zero Set but-
ton on the AMN2 just before taking the pressure
readings, while at ambient pressure.
5. Connect the hose to the AMN2.
6. Connect hose to the pressure being measured.
7. If using 0.01 mode, divide the reading displayed
on the LCD by 10. In other words, move the
decimal to the left one digit.
8. To disable the auto-power-off, remove the gray
rubber strip and flip the switch below. Autopower-off is helpful for conserving the battery;
but if you are data logging with Fieldpiece model
DL3, you will want to disable this feature.
9. If you are in an environment where the temperature is noticeably changing while you are taking
your reading, disconnect the meter from the
hoses and ZERO it relative to ambient pressure
before each reading.
Checking Gas Pressure on a Regulator
1. Screw the brass fitting into the pressure port on
the regulator. Some ports require an adapter.
2. Put unit into operation (i.e. turn on the furnace
and have furnace ignite, as if running it in normal 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
(ADMN2), 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.
Connect Your Way
EHDL1 HS series LT series
Fieldpiece Instruments, Inc.
A CALIFORNIA CORPORATION
www.fieldpiece.com
Specifications
Pressure Ports: Tube connector for 3/16 inch
(4mm) I.D. flexible tubing
Units of Measure: inches of water column (“WC)
Accuracy: @ 73°F, <90%RH
±0.4rdg (-20 to 20”WC), applied before dividing reading
by 10 on 2”WC range
±1.0rdg (-60 to -20”WC and +20 to +60”WC)
Resolution: 0.1 or 0.01 depending on resolution
selected (If 0.01”WC resolution is selected you
must divide displayed value by 10 for actual
value).
Measurement Range:
-60.0”WC to 60.0”WC
Operating environment:
32ºF (0°C) to 105ºF (41°C), 15-90%RH
Compatible media: Dry, non-corrosive gases
Battery: Single standard 9-volt battery, NEDA
1604, JIS 006P, IEC 6F22.
Battery Life: 150 hours, low battery LED indicator
on accessory head.
Overrange: “OL” or “-OL” is displayed.
Auto power off: 15 minutes
Dimensions: ~5 3/16”(131mm) (H) x ~2
7/16”(67mm) (W) x ~1 1/4”(32mm)(D)
Weight: approximately 154g (~1/2 pound)
including battery
Accessories included: 2’ (3/16”) I.D. flex tubing
w/typical gas pressure fitting, operators manual,
battery (installed), 5/16” adapter with tube.
Resolution Modes (0.1 and 0.01)
There are two modes of resolution on the AMN2.
For most applications, 0.1 mode will be fine to use.
When measuring low pressures (below 2”WC) 0.01
will likely be the best mode for meaningful testing.
The most common circumstance for 0.01 mode is
measuring static pressure across a blower.
Only when using 0.01 mode, the display of your
meter will show the true measurement X 10. So if
the true measurement is -0.05, your meter will show
-0.5.
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 verification 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 fitness 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.
Obtaining service
Call Fieldpiece Instruments for one-price-fix-all
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.
Gas pressure measurement
(0.1”WC resolution mode)
Static pressure across a blower
(0.01”WC resolution mode)
0.5mVDC / 10 = 0.05”WC
Manometer
Accessory
Head
Resolution
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
AMN2
ON
LO BATT
0.1
ON
OFF
Zero
Set
AUTO OFF
ON
Manometer
Accessory
Head
LO BATT
0.1
ON
Resolution
OFF
0.01
(LCD/10)
Converts
ON
Manometer
Accessory
Head
Resolution
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
1” water
column to
1mVDC or
LO BATT
10mVDC
(selectable).
0.1
ON
OFF
0.01
(LCD/10)
AUTO OFF
AMN2
AUTO OFF
Zero
Set
AMN2
ON
Manometer
Accessory
Head
Resolution
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
LO BATT
0.1
ON
OFF
0.01
(LCD/10)
Zero
Set
AUTO OFF
AMN2
Zero
Set
0.1
0.01
(LCD/10)
ON
Manometer
Accessory
Head
LO BATT
0.1
ON
Resolution
OFF
0.01
(LCD/10)
Converts
1” water
Zero
column to
Set
1mVDC or
10mVDC
(selectable).
AUTO OFF
3.0 inWC
AMN2
To Meter
3.0 mVDC
0.1
After
Zero
Blower
Set
ON
Manometer
Accessory
0.01
(LCD/10)
Head
Resolution
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.1
0.01
(LCD/10)
AMN2
To Me ter
AUTO OFF
LO BATT
ON
OFF
Zero
Set
2nd
1st
0.5 mVDC
0.05
inWC
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 counterclockwise one revolution to open.
4. Connect the AMN2 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 pressure boss by at least 3/8" to prevent leakage.
Outlet Pressure
Tap Screw
Outlet
Pressure
Boss
Inlet Pressure
Tap Screw
Smaller end (3/16”) of the adapter
connects to AMN2 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”)
More Products From Fieldpiece
Modular Expandability
Modular expandability is ability for accessory
heads and meters to change configurations to
match the various needs of an HVAC/R technician.
Accessory heads (the sensors) send out a mV
signal, which represents the value of the measurement, to whatever meter is attached to it. Heads can
attach directly to the top of a Stick meter, DL3 data
logger, or EHDL1. They can also plug into any meter
with mV ranges using ASLS2 leads.
Stick Meter
This is the heart of modular expandability. In addition to being a full functioning multimeter, any accessory head can be used with it.
Model HS36
Non contact voltage
Magnetic hanger
Autoranging
Backlight
Temperature
Volts, amps, ohms
Frequency
Microfarads
Includes:
HS36 Meter
ACH4 Current Clamp
ATB1 K-type TCouple
ADLS2 Deluxe Leads
ANC1 Case
Accessory Heads
Accessory heads are the sensors of multiple
parameters measured by technicians every day.
They plug into a mV range (depending on the head)
of a multimeter. The multimeter will display whatever the head is measuring. Instead of having to purchase and carry a separate instrument for each
parameter, a technician can use multiple heads and
a single multimeter to do the job.
Here are four of the many heads available:
AAV3 Air Velocity and Temperature
ADMN2 Dual-Port Manometer
AVG2 Digital Vacuum Gauge
AOX2 Combustion Check
Air Velocity
& Temperature
Head
English
READLOBATT
ON
LCDX
100
Average
(16sec)
Metric
Real
time
AAV3
AUTOOFF
English Metric
Ft/min M/s
KM/hrMPH
ºF ºC
OFF
CLAMP
300V
CAT.III
400A
AC Current
Clamp
!
1AAC / 1mVAC
400AAC MAX
N
O
E
L
T
T
A
H
AB
ST
OB
IS
L
L
NG
n
E
g
SH
t
IC
n
TR
ratio
li
E
e
o
M
a
4A
bco
rhe
13
R
e
u
C
S
Refrig
S
p
Su
nd
A
a
04
R4
p
rSC
m
o
re
e
T
H
S
u
s
s
e
r
P
C
/
T
l
a
C
et
S
M
T
A
N
t
O
a
B
o
L
E
L
B
A
T
S
on
busti
Com
Check
AS
t
S
A
G
IL
O
e
p
y
T
el
u
TO
F
F
U
F
A
O
L
/C
A
T
P
2
C
2
O
M
O
F
C
E
°
%
T
%
°C
2
X
O
A
ACH4
-
O
T
U
F
F
A
O
X24
AirVelocit
&Temperature
Head
O
N
L
C
y
L
D
1
O
X
0
B
0
A
T
T
E
n
g
R
lis
E
E
A
h
F
n
D
t
g
/
m
l
is
i
h
nM
Av
M
M
e
P
e
(
t
r
1
H
r
i
a
6
c
M
g
s
e
º
e
e
F
t
c
r
)
ic
K
/
s
M
O
/
h
F
R
r
F
e
t
ºC
a
i
m
l
e
A
U
T
O
O
F
-
F
AAV3
P1 P2
ON
Dual-Port
ON
Manometer
Accessory
Lo Batt
Head
0.1
ENGLISH
Resolution
0.01
METRIC
(LCD/10)
P1-P2
P2
P1
AUTO
ZERO
OFF
ADMN2
Combustion
Check
Lo Batt
STABLE
GAS
Fuel Type
OIL
TEMP
%CO
2
%O
2
AUTO
T/C
°C °F
CAL
OFF
AOX2