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 resolu-
tion mode. Special purpose static pressure instru-
ments 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. Auto-
power-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 tempera-
ture 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 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
(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
AMN2
Manometer
Accessory
Head
ON
0.1
AUTO OFF
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
LO BATT
Resolution
ON
Zero
Set
OFF
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 mate-
rial or workmanship for one year from date of pur-
chase. 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 exclu-
sions 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 serv-
ice. The meter will be repaired or replaced, at the
option of Fieldpiece, and returned via least cost
transportation.
0.05
inWC
0.5
mVDC
To Meter
Zero
Set
1st
2nd
After
Blower
AMN2
Manometer
Accessory
Head
ON
0.1
AUTO OFF
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
LO BATT
Resolution
ON
Zero
Set
OFF
Manom
Acces
Ac
so
Head
ad
0.1
0.01
0.01
(LCD/10)
0)
Resolu
lu
tion
ti
0.1
0.01
(LCD/10)
AMN2
Manometer
Accessory
Head
ON
0.1
AUTO OFF
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
LO BATT
Resolution
ON
Zero
Set
OFF
3.0
mVDC
To Meter
3.0 inWC
Ma
Manom
e
Acces
ces
sory
Head
0.1
0.01
1
(LCD/10)
Resolution
on
0.1
0.01
(LCD/10)
Gas pressure measurement
(0.1”WC resolution mode)
Static pressure across a blower
(0.01”WC resolution mode)
0.5mVDC / 10 = 0.05”WC
AMN2
Manometer
Accessory
Head
ON
0.1
AUTO OFF
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
LO BATT
Resolution
ON
Zero
Set
OFF
AMN2
Manometer
Accessory
Head
ON
0.1
AUTO OFF
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
LO BATT
Resolution
ON
Zero
Set
OFF
AMN2
Manometer
Accessory
Head
ON
0.1
AUTO OFF
Converts
1” water
column to
1mVDC or
10mVDC
(selectable).
0.01
(LCD/10)
LO BATT
Resolution
ON
Zero
Set
OFF
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