P234 User Manual
Safety and Precautions
Never run the meter dry or blow compressed air through the meter.
!
!
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.
!
!
!
i
i
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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Electrical
Environment: The transmitter is rated to operate in the 5 C to 90 C uid temperature range at an ambient temperature
range of 5 C to 80 C. If the ambient temperature rises above 55 C (130F), the maximum uid temperature at the ow
meter is de-rated as shown in the chart below.
P234 Transmitter Permissible Temperatures
100
80
60
55
40
20
Standard
Ambient Temperature °C
5
0
5
Process Temperature °C
Transmitter installation is via a 5-pin, M12 style Turck connector. The connector is sealed to the body at the factory and
is ready for use. If your installation requires conduit, PG-9 to conduit adapters are available from third parties. If using a
conduit setup, use a sealed conduit connection and conduit stop to protect the electronics from moisture and corrosives.
Follow the wiring diagrams on page 4 for replacing the 5-pin Turck connector with your own wiring.
WARNING: Electrical shock hazard. Serious or fatal injury may occur.
!
!
Installation/Removal should only be completed by trained and authorized personnel.
WARNING: The P234 is not designed for use in hazardous locations. Adapting the meter to
a conduit connection does not protect the system in a hazardous location. Do not use in a
hazardous location as death or severe injury may occur.
50
90
100
CAUTION: Verify transmitter output type (Analog or Frequency) before wiring.
!
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Inappropriate wiring could result in damaging the circuit.
Installation/Removal should only be completed by trained and authorized personnel.
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Frequency Output Transmitters (Versions ending with N/2)
V+
21
4
5
3
21
4
5
3
Turck®
Connector
PCA
Label
Pin #
Mating Cable
Wire Color
Power (+5 to 26 Vdc) V+ 1
Brown
Common Com 4 Black
Pulse Output Ph A 2 White
Output Phase B (Quad only) Ph B 5 Grey
Case Ground Case 3 Blue
Current Sinking Wiring (Versions ending with S/2)
A current sinking device uses the transmitter’s transistor output to act as a
switch. A positive DC voltage must be applied to the transmitter's output pin
(#2). When the pulse output is triggered, this voltage will be grounded to zero
volts by the transmitter. Warning: Use a 5k ohm resistor to limit current if your
system does not have any other means to limit the current into the transmitter.
Current Output Transmitters (Versions ending with A/2 or B/2)
Voltage Output Transmitters (Versions ending with C/2 or D/2 )
V+
0V
Out
Turck Pin #2 on
Industrial housings
Transmitter
PLC
Digital
Input
Turck®
Connector
PCA
Label
Pin #
Power * V+ 1
Common Com 4 Black
Signal Output (+) Sig 5 Grey
Signal Output (—)** Ret 2 White
Case Ground Case 3 Blue
Voltage or Current Analog Transmitters (Models ending with A/2, B/2, C/2 or D/2)
* Analog transmitters with part numbers ending in A/2 or C/2 are 24Vdc power. Part numbers ending in B/2 or D/2 are
12Vdc power.
** To minimize signal noise, analog output transmitters are fully isolated. If your PLC does not ground the negative
signal input, there is a risk of a ground shift that could drive the signal out of the range of detection. To prevent this from
occuring please consider installing a 10k pull down resistor between Common and Signal Output (-).
Mating Cable
Wire Color
Brown
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Field Compensation of Transmitter
The transmitter LED on the P234 top cover indicates a functioning system when it is producing a pulse output or
detecting magnet travel in the meter.
An alternating blue/green LED indicates that the circuit is detecting a magnet and provides an output signal.
A steady or ashing red LED indicates a problem with the transmitter PCA. Contact Max Machinery to have your P234
ow meter refurbished.
The Compensation Algorithm adjusts for variations in Hall sensor and ow meter characteristics to provide a stable,
undamped output frequency that accurately represents the instantaneous ow rate. This feature is factory set when the
meter is assembled. If the transmitter PCA is replaced or reset, the compensation can be performed via the gold PCA
button or through the software kit.
The only method of altering additional factory set parameters of the meter is through the Interface Software Kit, part
number SFT-KIT-001. Pulse Output Scaling, Analog Output Limits and Scaling, Signal Filtering Options and Compensation
settings are the adjustable variables.
WARNING: Electrical shock hazard. Serious or fatal injury may occur.
!
Access should only be completed by trained and authorized personnel.
CAUTION: Before opening/accessing the electronics lid, make sure the top of the P234
!
Instructions to access the gold PCA button and software serial port:
- Unscrew the captured philips head screws on the electronics lid.
- Remove and set aside the lid with o-ring seal.
- Optional: follow instructions for SFT-KIT-001 to connect to software serial port.
- Follow eld compensation instructions on page 6.
- To reinstall, ensure the o-ring seal is rmly seated. Assembly is then the reverse of disassembly.
meter and surrounding components are dry and no moisture or uids can contact the
electrical components. Non-warranty damage may occur.
Software Serial Port
LED
Gold PCA Button
O-ring in Groove
LED Window
Lid with
Captured Screws
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Field Compensation of Transmitter Continued
When a transmitter PCA is replaced or reset in the eld, the compensation routine should be performed to optimize the
performance of the system. This routine requires a steady ow rate between 35 cc/min and 2000 cc/min. The ow meter
being compensated must not be used for system ow rate feedback control during this process. The transmitter output
is disabled during the compensation routine.
If you are unable to run a stable ow in the eld, send your meter in to Max Machinery for calibration.
For the P234, the compensation routine is as follows:
1. Place your system in ‘manual’ mode or run in ‘open loop’ mode with no ow meter feedback control. Max
transmitter output shuts off during eld compensation routine. Loss of signal to ‘closed loop control’ modes can affect
the ow stabilization of the system and the compensation of the Max meter.
2. Stabilize the ow rate between 35 cc/min and 2000 cc/min.
3. Activate the compensation routine:
A - When using the software via the serial port connection, select ‘eld compensation’ in the software.
OR
B - If NOT using software, push the Gold PCA Button using a non-conductive tool.
4. The blue/green LED will change to solid blue for 4 revolutions of the meter. See table LED Functions on next page for
duration of compensation process. Duration is dependent upon ow rate.
5. A green LED light indicates a successful update of the compensation, a red LED light indicates the new compensation
failed. Additional information is available through the interface software.
6. Return your system to ‘operating’ mode or restore settings to allow for feedback control.
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LED Functions
Normal Operation
STATUS LED ACTION
Functioning - System Not Flowing Blue or Green Steady Meter is functioning, but no ow is detected in
the system.
Functioning - System Flowing Blue / Green alternating
colors
Meter Malfunction Red Steady Refurbish Meter.
No Power / Meter Failure No Light - Verify power supply to meter.
Meter is functioning, ow is occuring in the
system. Note: At high ow rates the alternating
Blue/Green ashes may appear as a single
steady color.
- Verify wiring follows diagrams on page 4.
- If power and wiring are veried, refurbish
meter.
Compensation via Interface Software Kit or Gold PCA Button
STATUS LED ACTION
Compensate button pushed/clicked Blue Steady - Steady light for 4-5 revolutions of meter.
Compensation Succeeded Green Steady - Steady light for 5 seconds.
- Software will show “Success” on screen.
Compensation Failed Red Steady - Steady light for 5 seconds.
- Software wil show “Flow too low/ too high/
unstable” on screen.
Note: Revolutions of meter are dependent on expected uid ow rate. Per the P234 specications, 4-5 revolutions of
the meter take approximately the following amount of time at the stated ow rates:
35 cc/min (minimum compensation ow rate) - 90 seconds
100 cc/min - 35 seconds
1000 cc/min - 1 5 seconds
2000 cc/min (maximum meter ow rate) - 1 0 seconds
If compensation fails, restart the compensation process. When using the Interface Software Kit, follow instructions
provided to correct errors prior to attempting compensation again. If problems persist, contact Max Machinery at
707-433-2662 or at www.maxmachinery.com.
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Specications
SPECIFICATIONS
Flow Range 1 to 2000 cc/min
Accuracy (1 cP) ± 0.4% of reading over a 100:1 range
Maximum Operating Pressure 3000 psi (210 bar)
Weight 4.1 kg
Recommended Filtration 10 micron
Port Size(s) 1/4 inch NPT or G 1/4-19 BSPP
Fluids Most aqueous based uids with a pH between 4 and 12
MATERIALS OF CONSTRUCTION
External Stainless steel, type 316, type 304; Blue Xylan 316 fastners;
Polycarbonate LED cover - avoid contact with solvents
Wetted Stainless steel, type 316; Graphite; PEEK; Nickel Carbide
O-Rings Standard: Viton®
Optional: Teon®, Peruoroelastmer
FREQUENCY TRANSMITTER
Output Signal Standard:
Optional: Quadrature 5 Vdc, two phase
Current sinking, 20 mA max., single phase
K-Factor
Two Phase:
(90 pulses/cc/phase, 1x decoded)
Power Supply Requirements 5-26 Vdc @ 30ma
Ambient Operational Range 5°C to 80°C
Metered Liquid Temp Range 5°C to 90°C
(based on 20° ambient)
Single Phase: 180 pulses/cc
5 Vdc, single phase
360 pulses/cc, 4x decoded
ANALOG TRANSMITTER
Output Signal Any range of ± 10V or ± 20mA linearized and damped
with anti-dither protection
Power Supply Requirements 12Vdc @ 90 mA, 24Vdc @ 45 mA
Ambient Operational Range 5°C to 80°C
Metered Liquid Temp Range 5°C to 90°C
(based on 20° ambient)
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Dimensions
1/4-20 UNC
MOUNTING HOLES
LED INDICATOR
OUTLET
PORT
1.125
.35
3.12
PORT TO PORT
DISTANCE
2.40
3.3
OVERALL
HEIGHT
2.61
2.95
4.61
TURCK 5-PIN / PG-9
CONDUIT CONNECTION
2.400
INLET
PORT
Charts
30
2 bar
25
1.5 ba r
20
15
1 bar
10
Pressure Drop (psi)
0.5 ba r
5
0
1 10 100 1000
4.610
4.610
Typical Pressure Drop (Delta P versus flow rate for various viscosies)
Expected Failure Area
Connuous Duty Area
1 cP
2000
Flow rate (cc/mi n)
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Part Matrix
Positive Displacement Flow Meters
Piston Type, P-Series 3000 psi (210 bar) rated, Water Based Fluids
an ISO 9001:2015 certified company
Flow Meter Selections Transmitter Selections
Model # MZ NA
/
1 1
2
/
-
2 Transmitter Type
Non-Standard Options
Bi-Directional Cal: BID
Max Flow Range Output Type
2 Liters/Min P234 MZ A A 4-20mA Output - Powered by 24 Vdc
A B 4-20mA Output - Powered by 12 Vdc
A C 0-10 Volt Output - Powered by 24 Vdc
A D 0-10 Volt Output - Powered by 12 Vdc
P N 5V Pulse/Freq. - Powered by 5-26 Vdc
Q N 5V Quadrature - Powered by 5-26 Vdc
P S Current Sinking, Single Phase
Pressure Temperature Rating
3000 psi (210 bar) MZ 1 90°C Industrial
Fluid Connection Electrical Connection
NPT 1 1 Industrial, Turck® Connector
G-Type / BSPP 6
Per uoroelastomer - FFKM 5 Q Quadrature
Product includes single directional calibration, bi-directional
calibrations for Analog and Quadrature devices are optional.
P234 User Manual Rev2018A -
Seal Selection Signal Type
Viton® - FKM 1 P Pulse
Te on® - PTFE 3 A Analog
Options
None NA
Max Machinery, Inc.
33A Healdsburg Avenue
Healdsburg, CA 95448
© 2008 - 2018 10
maxmachinery.com
T +1 70 7. 433. 2662 ©2008-2018
P234-USEMAN-REV2018A
Available Accessories
Accessories to support your system and simplify your installation and maintenance are available direct from Max.
Request yours when you order your ow meter. See the website for information and options.
Interface Software Kit
Part # Description
SFT-KIT-001 USB drive transmitter programming software and serial cable.
The following adjustments may be made to the signal output:
Pulse Output Scaling, Analog Output Limits and Scaling, Signal
Filtering Options and Compensation settings.
Cables
Part # Description
181-294-060 7 meter cable - 5-pin Turck® to wire
181-294-061 15 meter cable - 5-pin Turck® to wire
Model 122 Combination Rate Indicator/Totalizers
110/220 Vac powered (frequency input)
Model Description
122-200-000 Panel mount indicator with dual-line, 6-digit display (0.6” and
0.46”). Produces an isolated 4-20mA analog output. Provides 24
Vdc transmitter power. Can be programmed to show rate, total
and/or grand total. Initial programming included as default or
customer specied values.
381 Series Filters and Filter Elements
Model Description
381-102-000 Inline lter with 10 micron element included. O-rings options
available to match your ow meter and system requirements.
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Troubleshooting and Service Request
Problem Corrective Action
No Flow through meter or high pressure drop across meter
Solidied material blocking rotation
Heat meter to melt material. Do not exceed maximum
meter operating temperature.
Debris damage or internally clogged
Meter broken
Refurbish meter.
Refurbish meter.
Fluid passes through meter, but no ow is indicated
Transmitter cable or conduit cable incorrectly wired
Meter not turning
Verify DC power is present at the PCA. Use a multi-meter to
measure the transmitter output independent of the display
or PLC.
Refurbish meter.
Indicated ow does not agree with expected readings
Air in the line
Indicator not calibrated properly
Excessive reverse ow in system
Air bubbles displace the meter just like a liquid. If
you see over-reporting, purge all air from lines.
Verify K-Factor for the meter in use and compare
this value to the setting used in the display.
Max transmitters’ anti-dither function buffers up to 1
revolution of reverse ow. An incorrect ow total can be
reported if the system reverse ow is greater than 1 meter
revolution.
Additional Information Available
MMI provides refurbishment and calibration services. For more details or to submit your Service Request, go to
https://www.maxmachinery.com/services/.
Additional information about our products, including STEP les and Sample Calibration sheets, may be found on our
website at https://www.maxmachinery.com/downloads/.
MMI products are covered under our standard manufacturer’s warranty. Details may be found at
https://www.maxmachinery.com/warranty/.
Max Machinery, Inc., 33A Healdsburg Avenue, Healdsburg, CA 95448 USA
707.433.2662 | www.maxmachinery.com
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