Max P234 User Manual
P234 User Manual
Safety and Precautions
Never run the meter dry or blow compressed air through the meter.
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Damage will occur.
Never steam clean the meter. Damage will occur.
(Bypass or remove the meter if necessary).
Do not disassemble the meter. Damage may occur.
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!
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No serviceable parts inside.
Do not over pressurize the meter. Damage may occur.
Maximum pressure is 3000 psi.
Do not operate P234 ow meters in a hazardous environment. For ow meters
rated for ATEX, UL, or cUL Class 1, Div. 1 use in a hazardous environment,
contact Max Machinery Sales at 707.433.2662 or www.maxmachinery.com.
Read the entire manual before installing and operating the meter.
Verify the uid to be measured is compatible with the ow meter.
Filter your uid to prevent damage from debris and foreign materials.
10 micron ltration recommended.
Install bypass plumbing around the owmeter to allow for easier servicing and
line purging/ushing without damaging the meter.
Follow all local regulations and your company safety procedures when
installing, operating, servicing, and maintaining your ow meter.
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Table of Contents
Safety and Precautions ........................................................................ i
Table of Contents .................................................................................. ii
How It Works ........................................................................................... 1
Installation ............................................................................................... 1
Mechanical ............................................................................................... 1
Operation ................................................................................................ 2
Electrical ................................................................................................. 3
Field Compensation of Transmitter ..................................................5
LED Functions ........................................................................................ 7
Specications .........................................................................................8
Dimensions .............................................................................................9
Charts ...................................................................................................... 9
Part Matrix .............................................................................................10
Available Accessories ........................................................................... 11
Troubleshooting and Service Request ............................................12
Additional Information Available ......................................................12
Max Machinery, Inc. (MMI) reserves the right to change product specications without notice to improve performance,
reliability, or manufacturability. MMI shall not be held liable for operational, technical, or editorial errors/omissions. Visit
our web site for the latest version of this user manual.
Max Machinery, Inc., 33A Healdsburg Avenue, Healdsburg, CA 95448 USA
707.433.2662 | www.maxmachinery.com
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How It Works
Max P234 Precision Flow Meters are positive displacement piston meters that are able to operate over a wide range
of ow rates and uid viscosities and are specically designed to be compatible with aqueous based solutions. High
accuracy measurement is achieved through precision machined radial pistons that move proportional to the ow. High
resolution outputs are produced by measuring the direction and speed of the pistons and converting the signals to
analog and frequency outputs. Flows can be monitored from 1 cc/min up to 2000 cc/min with uid temperatures from
5 deg C to 90 deg C and a maximum pressure of 3000 psi (210 bar). The meter electronics are protected against water,
dust, and most corrosive liquids. The 5-pin Turck connector provided is IP68 and mounts to the meter body via a PG-9
connection that can be adapted to conduit. Optional liquid seal materials may be specied to allow for uid compatibility.
Max Machinery, Inc. designs, manufactures, calibrates, and refurbishes high accuracy, high resolution, precision liquid
ow meters under an ISO 9001:2015 certied quality management system. All Max Precision Flow Meters are tested
and calibrated in our lab and provide measurements traceable to NIST. If your calibration certicate is lost or missing,
contact MMI with your meter serial number for a copy.
Installation
Orientation: The P234 mounts vertically with the inlet port on the bottom and the outlet port on the top (See diagram on
page 2). This is the only manufacturer’s suggested mounting that will allow for air to be purged from the system. Air in
the system can cause response delays and errors in measurement.
Bypass Valves: Install valves to allow system start-up, lter replacement, or ow meter removal without completely
shutting the system down and draining the lines. See diagram.
Failure to use a bypass at start up may lead to ow meter damage due to debris, overspeeding the meter with air in the
lines, and pressure shock due to initial line surges.
Filtration: A 10 micron lter is recommended on the inlet side of the meter. If measuring bi-directional ow, a lter should
be installed on both sides of the ow meter. Materials with brous or non-abrasive particulate matter may need to be run
without lters.
Clean Plumbing: Before installing the ow meter, the system lines should be cleaned and free of all debris or
manufacturing particulates. Purging lines with compressed air or steam are typical cleaning methods. Do not use
compressed air or steam on the Max ow meter, damage will occur.
Mechanical
Inlet and Outlet ports may be NPT or BSPP (G-Type). The product part number denes the type of liquid tting. Use the
part matrix located on page 10 to determine the type of ports on your product and the Specications section on page 8
to determine the diameter and thread pitch.
The P234 may require additional mounting support beyond the uid connection lines. Additional mounting holes
are located on two opposing sides of the base of the product. These holes are 1/4-20 UNC located 1.125 inches apart
horizontally.
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Operation
Determine that the following parameters of your ow metering system are within the specications for the specic
meter being used:
Maximum System Pressure (Specications)
Differential Pressure across meter (Pressure Drop Curves)
Maximum Flow Rate (Pressure Drop Curves)
Metered Fluid Temperature (Sales specication, transmitter specications)
If the difference in metered uid temperature versus ambient is greater than 75°F (41.6°C), see the “High
Temperature Start Up” section below.
With valves (#1) and (#2) closed, slowly open valve (#3) (bypass) to clear the lines of foreign particles and air.
Slowly open the inlet valve (#1). Slowly open the outlet valve (#2). Completely close the bypass valve (#3).
No routine maintenance, cleaning, or lubrication of the ow meter is required. A routine lter cleaning schedule
should be established. The system should be shut down if abnormal noises occur or if unusual differential pressures
across the meter are encountered.
High Temperature Start Up: For uids above 145°F (62.8°C) based
on 70°F (21°C) ambient, a specic procedure is required. To avoid
temperature shock, ow should be very slowly ramped up over
approximately 5 min per 75°F (41.6°C) over ambient. Start with
all valves closed and smoothly open valve #3 to allow bypass ow
around the meter. Then over the calculated time interval for warmup,
incrementally open valves #1 and #2 and incrementally close valve
#3. If valving and a bypass circuit were not installed, then use supply
pressure control to similarly ramp up ow rate slowly over time.
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