Max 243 User Manual
Positive Displacement
DISCONTINUED
Flowmeters
Operational Manual
For Model:
Model 243 Only
240 Helical Series
Positive Displacement Flow Meters
Max Machinery, Inc. Discontued: 243 Manual © Copyright 2014 1
Table of Contents
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Meter General Description ...................................................page 3
Transmitter General Description ...................................... page 4
Meter Specications ..............................................................page 3
Transmitter Specications
Analog .......................................................................................page 4
Transmitter Specications
Frequency (Pulse) ...................................................................page 5
Do and Don’ts ..........................................................................page 8
Installation ...............................................................................page 6
Piping Diagrams ......................................................................page 7
ANSI FlangeANSI Flange Stud Torque ..............................page 8
Operation .................................................................................page 9
Troubleshooting .....................................................................page 12
241 Helical Flow Meter ......................................................... page 16
242 Helical Flow Meter .........................................................page 17
243 Helical Flow Meter .........................................................page 13
Contact for Repairs
& Calibration Services ......................................................... page 14
Custom Instructions for Hazardous Locations/Explosion Proof Housing:
http://www.maxmachinery.com/content/explosion-proof-installation-instructions
DO NOT ATTEMPT TO INSTALL OR START FLOW METER WITHOUT READING THIS ENTIRE MANUAL
Max Machinery, Inc. (MMI) reserves the right to make changes to the product in this Instruction Manual to improve performance, reliability, or
manufacturability. Consequently, contact MMI for the latest available specications and performance data. Although every effort has been made to
ensure accuracy of the information contained in this Instruction Manual, MMI assumes no responsibility for inadvertent errors.
Max Machinery, Inc. Discontued: 243 Manual © Copyright 2014 2
Meter General Description
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The Max 240 Series Flow Meters are positive displacement helical rotor type units capable of precise measurements
over a wide range of ow rates and uid viscosities.
The three sizes of this series (241, 242, and 243) will measure ows from 0.1 L/min to 1400 L/min. Material viscosities
between 3 and 1,000,000 centipoise may be accommodated.
In a helical rotor type ow meter, a precise amount of the uid being measured is trapped between the rotors as they
turn. This motion is used to turn a gear coupled to a magnet. An external transmitter senses the motion of the magnet
and converts this signal into a voltage, pulse or 4-20 mA current ow rate output. For some transmitter models, the
magnet is eliminated and the motion of the gear itself is sensed.
The Max Series 240 Meters are of simple and rugged construction. They can be expected to perform superbly if treated
within the connes of the design envelope. For this reason, it is important to read this manual and understand the
operational requirements and limits of the meter.
Our Technical Service staff will be happy to answer any questions that this manual does not cover.
Meter Specications
Model 243
Gal/min 370
Liters/min 1400
Maximum pressure, bar (psi)
Standard NPT 35, (500)
600 lb ANSI RF anges 105 (1500)
1500 lb ANSI RF anges 245 (3500)
2500 lb ANSI RF anges ---
Pressure drop, bar (PSI)
Operating maximum 5.3 (75)
Absolute maximum 10 (150)
100% ow, 3 CPS 0.7 (10)
Displacement, L/Rev 0.574
Weight, Kg (Lb) 45.5 (100)
295 Transmitter 1500
289-700 Transmitter 58.8
Port size
NPT 3”
ANSI RF anges 4” (DN100)
1
Maximum ow rate,
2
Maximum temperature Up to 265° C (500° F)
3
Recommended ltration 150 micron
4
Typical K-Factor, (pulses/liter)
Notes:
1
For viscosities of 3 CPS or less. Derate per pressure drop curves for higher viscosites.
2
Limited by meter seal material, transmitter model, orientation and ambient temp. See manual. Consult factory.
3
Some materials may have different lter requirements. Consult factory
4
Typical. See ow meter/transmitter calibration sheet for actual K-factor and accuracy data.
Max Machinery, Inc. Discontued: 243 Manual © Copyright 2014 3
Dos and Don’ts
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DO: DON’T:
• Install a bypass line around the meter
• Clean the lter on a regular basis
• Purge air from the meter before operating your system
(Flowing near the meters maximum ow rate for a
given viscosity will purge air bubbles. Tilting, tapping or
shaking the meter at lower ow rates will also dislodge
entrapped air)
• Run water or aqueous solutions through the meter
• Put steam or compressed air through the meter.
• Disassemble the meter
• Apply excessive differential pressure across the meter
• Exceed the maximum ow rates or pressure ratings for
• Let materials solidify in the meter
• Try to pump through the meter if it contains frozen
(except the 234 Series of meters)
your meter
material. Re-melt the material completely before
trying to pump through the ow meter.
Transmitter Specications - Analog
Supply Voltage 12 Vdc (Models 29X-XXX-100)
24 Vdc (Models 29X-XXX-000)
Supply Current 90 mA max@ 12 Vdc, 45 mA max@ 24 Vdc
Short Circuit Current 21 mA
1
Output Update Rate 1 ms
Resolution Adjustable without recalibration to any range of ± 10 Vdc
Model 29X-3XX-XXX or ± 20 mA Model 29X-2XX-XXX
Ambient Temperature Range Transmitter (Storage)–40ºC to 85ºC (–40ºF to 185ºF)
Maximum Temperature, Process Fluid
For explosion proof models see: http://www.maxmachinery.com/content/explosion-proof-installation-instructions
(20ºC Ambient, 5V supply) Standard Model 90ºC (195°F) – Models 295 & 296
High Temp Model – Model 296
Ultra-High Temp Model 225ºC (435°F) – Models 295 & 296
Anti-dither Range Software selectable from 1-100% of 1 revolution.
50% of a meter revolution - unidirectional
2% bidirectional are typical default settings
Signal Filtering Software selectable from 1 ms to 64 sec. time constant
1
Full step change is subject to signal damping
2
Temperature of metered uid will affect transmitter temperature, see graph below
2
Transmitter (Operation)–40ºC to 80ºC (–40ºF to 175ºF)
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Transmitter Specications - Frequency (Pulse)
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Supply Voltage 5-26 Vdc
Supply Current 25-30 mA typical
Output (5.0 Volt Supply) No Load 0.00 / 4.80 Volts
(TTL and CMOS compatible) 2.5K Load to Common 0.00 / 4.60 Volts
2.5K Load to +5 Volts 0.25 / 4.80 Volts
Short Circuit Current 45 mA
Output Impedance 100 Ω
Rise/Fall Time 0.2 μSec
1
Output Update Rate 1 ms
Min/Max Frequency 0-60 kHz
Resolution 1 - 1000 pulses/rev, Single Phase
1 - 500 pulses/rev/phase, Quadrature
Ambient Temperature Range Transmitter (Storage)–40ºC to 85ºC (–40ºF to 185ºF)
2
Transmitter (Operation) –40ºC to 80ºC (–40ºF to 175ºF)
Maximum Temperature, Process Fluid
For explosion proof models see: http://www.maxmachinery.com/content/explosion-proof-installation-instructions
(20ºC Ambient, 5V supply) 29X-X0X-XXX Standard Model 90ºC (195°F)
29X-X5X-XXX High Temp Model — 2 part model 225ºC (435°F)
Anti-dither Range Software selectable from 1-100% of 1 revolution.
50% of a meter revolution - unidirectional
2% bidirectional are typical default settings
Signal Filtering Software selectable from 1ms to 250ms time constant
1
Full step change is subject to signal damping
2
Temperature of metered uid will affect transmitter temperature, see graph on previous page
Temperature Range Specication (Analog & Freq.)
Model 29X Transmitter Series
120
110
100
80
60
40
20
295 & 296 296 295 & 296
Standard
High
temperature
2 part pickup
Ultra High
temperature
2 part pickup
Ambient Temperature °C
0
-25
50
100
Process Temperature °C
150 200
225
250
300
Max Machinery, Inc. Discontued: 243 Manual © Copyright 2014 5
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