INSTALLATION & OPERATION INSTRUCTIONS

OF MR SERIES FLOWMETER
The MR flowmeters INSTALLATION
are available in various ranges in both SAE and SI In order for flowmeter to function properly, it is
units for air and water. These direct-reading scales important that the flowmeter is mounted vertically.
are also available for other gases and liquids. If the When installing 1/8-27 MNPT fittings into the
flowmeter is used for fluids other than air and flowmeter, care should be taken not to over tighten
water, please consult chemical compatibility data them. The fittings should be installed with a
for possible effects on the meter. When properly maximum torque of 60 in-lbs. Use pipe thread
installed and maintained, this durable Polycarbonate sealant or Teflon® tape to achieve a positive seal
flowmeter will provide many years of trouble-free when connecting the flowmeter. The flowmeter is
service. provided with two clips and two 10-32 screws, to be
used in conjunction with the female threads on the
UNPACKING backplate of the flowmeter. These 10-32 screws
Precautions have been taken to prevent any damage should be installed with a maximum torque of 5
from occurring during shipment. However, if the in-lbs. Caution! Exceeding these specifications
meter is damaged when received, report it to the may cause damage to the flowmeter. (See Figure
carrier immediately. Before installing, verify that 1 for the location of the mounting holes.)
the model received is the model and flow range that
is required. MAINTENANCE
Occasional cleaning may become necessary if dirt
ACHIEVING ACCURATE FLOWRATES appears in the flowmeter or if float movement is
To obtain an accurate flowrate, the float must be restricted. To clean, rotate “Retaining Clip” (See
read correctly. If the meter has a ball float, the Figure 1) counter-clockwise, approximately 1/8
flowrate should be read from the center of the ball. turn, to align clip with slot. Gently remove the
If the meter has a bullet float, the flowrate should be retaining clip from the flowmeter. The top plug,
read from the groove in the float. Additionally, the ring and gasket can then be removed. Once the
flowmeter should be installed vertically and in a outlet fitting is removed from the back of the meter,
manner, which minimizes both external vibrations the float can then be removed. It is not necessary to
and internal flow variations. Special care should be remove the flow tube from the flowmeter body.
taken so that the connections to the meter’s inlet Wash flow tube, float, outlet fitting and top plug
and outlet fittings do not overly restrict the liquid or with clean water and a soft brush. Rinse all parts
gas flow being metered. This could result in a with clean water and dry thoroughly. To
reduced flow volume, preventing the meter from reassemble, simply reverse the disassembly process.
reaching its maximum flowrate. Furthermore, Do not use solvents or strong bases for cleaning.
internal pressures could be affected, which can
cause inaccurate flow readings. On start-up, slowly
purge any air/gas trapped in the meter.

CAUTION
THIS FLOWMETER IS DESIGNED FOR USE WITH NON-HAZARDOUS FLUIDS AT PRESSURES UP TO 100 PSIG (690 KPA) AND TEMPERATURES
UP TO 150 °F (65 °C). DO NOT USE HAZARDOUS FLUIDS AND DO NOT EXCEED TEMPERATURE OR PRESSURE LIMITS. USE WITH
HAZARDOUS FLUIDS OR EXCEEDING THE PRESSURE OR TEMPERATURE LIMITS MAY CAUSE FAILURE WHICH COULD RESULT IN INJURY.
IDT140 REV. 2
 MR SERIES FLOWMETER
INSTALLATION INSTRUCTIONS

1
RETAINING
3/4 CLIP
1 3/8
1/8 FNPT
TYP.

10-32 Thread

4 13/16 4 9/16

1 5/8 3

1 1/16
3/8

1 5/8 49/64

Figure 1

MR SERIES FLOW RATES

RANGE MODEL RANGE MODEL
SCFH OF AIR CODE LPM OF AIR CODE
SPECIFICATIONS
0.1-1 3A00 0.05-0.5 3A12
0.2-2.5 3A01 0.1-1.5 3A13 ACCURACY: ± 4% FULL SCALE
0.4-5 3A02 0.4-5 3A14
1-11 3A03 0.2-2.5 3A23 BODY & TUBE: POLYCARBONATE
1-22 3A04 1-10 3A15
BLACK GLASS, CARBIDE,
4-60 3A05 2-30 3A16 FLOATS:
STAINLESS STEEL, ALUMINUM
10-110 3A06 4-50 3A17
20-200 3A07 10-100 3A18 PRESSURE: 100 PSIG MAX

TEMPERATURE: 150° F/ 65° C MAX

GPH OF WATER CODE CCM OF WATER CODE
0.2-2.5 3L28 4-50 3L09 BUNA N WITH BRASS FITTINGS &
SEALS:
0.4-5 3L19 5-110 3L10 VITON WITH STAINLESS STEEL
1-10 3L20 20-300 3L11
2-25 3L21

CONTINUED PRODUCT IMPROVEMENT MAY RESULT IN SPECIFICATION REVISIONS

WHEN ORDERING PARTS PLEASE INCLUDE PART DESCRIPTION, ITEM NUMBER AND TYPE OF MATERIAL REQUIRED.
IDT140 REV. 2