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INSTRUCTION MANUAL

286

300 SERIES TRANSMITTERS

286-

313:

Transmitter with Amphenol Connector

286-

323:

Transmitter, Weather

Tight, Explosion Proof*

286-

3x4:

Transmitter with Output Level Shifter Option

286-31x-

5xx:

Transmitter with Remote PCA

TABLE OF

CONTENTS

General Description...................................................

Pg 2

Specifications ............................................................

Pg 3

Mechanical Installation .............................................

Pg 4

-5

Outputs, Options, and Indicators...............................

Pg 6

-8

Calibration................................................................

Pg 9

-10

Maximum Transmission Distance.............................

Pg 11

-12

K-

factors....................................................................

Pg 13

Appendix A: Remote Mount Transmitter .................

Pg 14

-15

Appendix B: Output Level Shifter Option................

Pg 16

Schematics:

286-313-

201 RVDT Schematic

181-000-

250

Interconnect Schematic

* U.L. Class I, Group C & D

Class II, Group E, F & G

286-300-

Max Machinery, Inc.

Rev: 4/03, added Appendix A and B

Max Machinery, Inc.

reserves the right to make changes to the product in this instruction manual to improve

performance, reliability, or manufacturability. Contact

MMI

for the latest available specifications and

performance data.

Although every effort h

as been made to ensure accuracy of the information contained in this instruction

manual,

MMI

assumes no responsibility for inadvertent errors.

Discontinued

Summary of content (16 pages)

PAGE 1
INSTRUCTION MANUAL 286-300 SERIES TRANSMITTERS ed 286-313: Transmitter with Amphenol Connector 286-323: Transmitter, Weather-Tight, Explosion Proof* 286-3x4: Transmitter with Output Level Shifter Option 286-31x-5xx: Transmitter with Remote PCA co nt in u TABLE OF CONTENTS General Description................................................... Pg 2 Specifications ............................................................ Pg 3 Mechanical Installation .............................................
PAGE 2
General Description General Description The 286-3XX Series Transmitter converts the rotary motion of the metering elements inside a Max Flow Meter into a frequency proportional to the flow rate. This is accomplished using a differential transformer technique, which puts no torque requirements on the flow measuring elements and enables extremely fast output response rates. A microprocessor measures position changes of the metering elements and generates the corresponding output pulse stream.
PAGE 3
Specifications Specifications Lo 0.04 V 0.04 V 0.25 V D is co nt in u ed Supply Voltage........................................................................ 4.5 VDC to 30 VDC Supply Current.................................... 12mA Typical, 20mA Maximum (+ Load) Output (5.0V Supply) .......................................................................................... Hi No Load.............................................................................................. 4.80 V 2.
PAGE 4
Mechanical Installation Installation Mounting: The Model 286 transmitter screws on and off of the flow meter. Due to the random location of the starting point of the threads, one transmitter will probably not line up with the “in” and “out” ports of the flow meter like another will. The electrical outlet of the transmitter can be rotated clockwise or counter clockwise one turn by loosening the clamping screw. See the Transmitter Diagram (next page).
PAGE 5
Mechanical Installation Transmitter Diagram O-Ring ed Connector 1/2" NPT or Weather tight Amphenol Circuit Board Clamp Screw in u Retaining Ring LOOSEN TO ROTATE ELECTRICAL HOUSING nt O-Ring co Stator Assembly Rotor Assembly Transmitter - Flowmeter Threaded Connection 210 Series Flow Meter IN D is O-Ring Wrench Flats 286-300-350 © 2002, Max Machinery, Inc.
PAGE 6
Options &Options Outputs, Status Indicators & Indicators Outputs, Options and Indicators Connections: The interconnect drawing number 181-000-250 at the end of this manual provides detailed information on interfacing to Max signal conditioners and indicators. ed Output Protection: Voltage should not be applied to any output (terminals 4, 5, and 6). If a low voltage, 5V or less, is accidentally applied to an output, resistors and diodes will protect the circuitry.
PAGE 7
Outputs, Options & Indicators Output Frequency Select: S3: Rotary switch allows selection of output resolutions of 24 to 1000 pulses per revolution (square wave output), or 12 to 500 pulses per revolution (per phase) if the 2-phase output option is selected. The resolution can be changed while the tachometer is operating, and the new value will take effect immediately. See chart below for resolution at each switch setting. Terminal Block 1. Case (Green) 2. Common (Black) 3. Power 5-30VDC (Red) 4.
PAGE 8
Outputs, Options & Indicators Output Indicators: D10, D11: These bi-color (red, green) LEDs indicate the status of the outputs. If the 2-phase output mode has been selected, the state of Phase A and Phase B are each shown on the corresponding LEDs (‘OUT/ A’ and ‘DIR/ B’). If the combined output mode has been selected, the LED labeled ‘OUT/ A’ shows the status of the pulse output channel, and the LED labeled ‘DIR/ B’ indicates the direction.
PAGE 9
Calibration Calibration ed The coils of the Model 286 stator, the printed circuit board, and the flow meter need to be calibrated as one set. When used with any flow meter model, the calibration procedure initiates a routine that determines the offsets needed to balance the output signals from all of the coils. When used with a 210 series piston flow meter, the calibration procedure includes an additional routine that measures the angular position of the stator with respect to the meter.
PAGE 10
Calibration The phase balancing routine that occurs for all types of meters requires 16 revolutions of the meter to reach completion. The ‘CAL’ LED changes color (red to green or green to red) 4 times per revolution, or 64 blinks for the entire calibration. The angular position determination (phasing) requires 8 revolutions, so the ‘CAL’ LED will blink an additional 32 times after the 64 phase balancing blinks when calibration is performed on a piston meter.
PAGE 11
Maximum Transmission Distance 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 286-3XX Series Transmitters. ed Cable Capacitance vs. Length in u 100 nt co 1 is Capacitance (uF) 10 2 or 4 Conductor Shielded Cable Belden 8762 V1000 (20 GA), Belden 8723 (2 Shielded Pair) 0.
PAGE 12
Maximum Transmission Distance Maximum Transmission Distance (continued) The graph below shows the relationship between output capacitance loading and rise and fall time for the Model 286-3XX 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 286 could transmit would be 50 kHz (frequency = 1/time, where time includes the rise and fall times for one cycle).
PAGE 13
K-Factors K-Factors K-factors represent the number of pulses the transmitter outputs per unit volume of fluid passing through the flow meter. This number is dependent on the flow meter and the transmitter resolution setting (switch S3). Max Machinery indicators can be adjusted to display the desired units (ccs, lbs, gallons, quarts, etc.) by using the K-factor. Existing K factor New Resolution Existing Resolution in u New K-factor ed Flow meters are multi-point calibrated at the factory.
PAGE 14
Appendix A: Remote Mount Transmitter 286-313-500 Remote Mount Transmitter (Aluminum Housing) 286-313-525 Remote Mount Transmitter (Polycarbonate Housing) 286-314-500 Remote Mount Transmitter with Output Level Shifter (Aluminum Housing) 286-314-525 Remote Mount Transmitter with Output Level Shifter (Polycarbonate Housing) ed General The 286-313-500 and 286-313-525 Remote Mount Transmitters allow the transmitter circuitry to be located separately from the flowmeter and RVDT stator.
PAGE 15
Appendix A: Remote Mount Transmitter Temperature Considerations Continuous exposure of the stator housing and the circuitry to high ambient temperatures should be avoided if possible. It is a good idea to locate both of these components away from hot spots such as steam pipes, ovens, and heaters. The circuitry in the remote enclosure is rated for operation up to 80°C, so this is the limit on the ambient air temperature at the enclosure.
PAGE 16
Appendix B: Output Level Shifter Option 286-314: 286-324: 286-314-500: 286-314-525: Transmitter with Amphenol Connector, Level Shifter Option Transmitter, Weather-Tight, Explosion Proof, Level Shifter Option Remote Transmitter (Aluminum Housing), Level Shifter Option Remote Transmitter (Polycarbonate Housing), Level Shifter Option Output Level Shifter Specifications in u ed General Both the standard and remote transmitter circuit boards have the capability for additional circuitry that gives output vol