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INSTRUCTION MANUAL

234 FLOW METER/TRANSMITTER

TABLE OF CONTENTS

General Description ............................Pg 2

Specifications .................................Pg 3

Mechanical Installation .........................Pg 4-5

Electronic Installation ..........................Pg 6-12

Do’s and Don’ts ................................Pg 13

Performance Curves ...........................Pg 14-15

Max Machinery, Inc. 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 specifications 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.

Summary of content (15 pages)

PAGE 1
INSTRUCTION MANUAL 234 FLOW METER/TRANSMITTER TABLE OF CONTENTS General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pg 2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pg 3 Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . Pg 4-5 Electronic Installation . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 2
General Description The Max 234 Series Flow Meters are positive displacement units specifically designed to be compatible with aqueous based solutions. Metering is accomplished by four radial pistons which are moved by the fluid stream being monitored. The motion of the pistons, which is proportional to flow, moves a pair of magnets. A built in electronic transmitter detects the magnetic motion and provides five volt CMOS/TTL compatible square wave and quadrature outputs.
PAGE 3
Specifications Materials Of Construction Body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fasteners-Structural . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pistons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
Mechanical Installation Orientation: The Model 234 is internally ported to allow air to be fully expelled from the meter provided the fluid enters from the bottom (as shown below). Air in the system can cause response delays and errors in measurement. If the meter has to be mounted 90 degrees from what is shown, accuracy at low flows (less than flow rate in cc’s x viscosity in centipoise = 200) may be affected.
PAGE 6
Electronic Installation Environment: The transmitter housing should be kept as cool as possible due to the temperature limits of the electronic components. If the ambient temperature rises above 1300F (550C), the maximum fluid temperature at the flow meter will have to be derated. The weather-tight versions of the flow meter require that the electrical conduit connection be sealed with pipe dope or a potting fitting.
PAGE 7
Electronic Installation 4.5-24 234 Series also use 220/240 Due to the single sine wave output of the LVDT encoder, the resolution is 1/2 of the values screenprinted on the PCB. Microprocessor Reset: S2: In the event that the tachometer does not appear to be operating correctly, resetting the microprocessor by momentarily depressing S2 may solve the problem.
PAGE 8
Electronic Installation ‘SLOW’ LED: D8: If a calibration is initiated but the flow rate is too low to give acceptable results, the calibration will be aborted, and this LED will light up red for 10 seconds. See Calibration Section for more information on calibration procedures. ‘MEMORY FAIL’ LED: D7: The microprocessor continually checks the integrity of its program storage memory. If one or more memory values do not read what they are supposed to, this LED will turn on.
PAGE 9
Electronic Installation When to Calibrate Calibration should be performed under the following conditions: 1. If the circuit board of the transmitter is changed. 2. If the connector between the pickup coils and the circuit board is reversed. 3. If it is suspected that the output signal contains more frequency modulation than it should have. (i.e.: Pulse widths vary by more than ±15%, and variations are not random, but cyclical at 4 times per revolution) Calibration Procedure 1.
PAGE 10
Electronic Installation Maximum Transmission Distance The graph below indicates typical conductor capacitance loads versus cable length for several types of cable. For instance, 1000 feet of 7 conductor #18 gauge stranded wire will put a 0.04 uF capacitive load on the output of the 234 Series Transmitters. ( 10 ) 234-000-350 © 2005 Max Machinery, Inc.
PAGE 11
Electronic Installation Maximum Transmission Distance (continued) The graph below shows the relationship between output capacitance loading and rise and fall time for the Model 234 output signal. For instance, with 0.04uF load capacitance (1000 ft. shielded cable typ.) the rise/fall time is 10 uS. Consequently, the absolute maximum frequency the Model 234could transmit would be 50 kHz (frequency = 1/time, where time includes the rise and fall times for one cycle).
PAGE 13
Do’s and Don’ts DO: Install bypass plumbing around the flow meter. This is useful during start-up for removing dirt and air from the plumbing or when metering high temperature materials. It also allows removing the flow meter for service without disabling the system. DO: Be very careful to keep parts clean during installation or a teardown. A little dirt can look like a truckload compared to the 10 micron filtration requirement. DO: Clean the filter on a regular basis.