M334 - Meriam Process Technologies
Contents
1. on the display Approximately one to four hours of typical operation remain before the 334 will automatically turn off To change the batteries remove the rubber boot remove the battery door from the back of the unit by sliding the door downward This will allow access to the battery compartment Replace with four 4 AA 1 5V batteries being careful to check the polarity Place the battery door back on the unit and replace the rubber boot Note Alkaline batteries are supplied and recommended for maximum battery life and performance Meriam Process Technologies 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Sourcing Milliamps mA OUT OUT Percent of 4 to 20 mA Choose this function to provide an output from 0 00 to 24 00 milliamps The compliance voltage is a nominal 24 VDC to provide the driving power to your milliamp receivers 1 Disconnect one or both input wires from the device to be calibrated 2 Select mA or 4 to 20mA with slide switch 3 Select SOURCE using slide switch 4 Connect the output leads of the Meriam Model M334 to the inputs of the device being calibrated making sure to check polarity Red lead to the plus input and black lead to the minus input The output is adjusted by turning knob while the EZ CHECK switch is in the DIA position or the current can be set at the2. A meriam MGU By eer process technologies 4 20 mA Loop Calibrator Operating Instructions Product Description EASY TO USE With the Meriam Model M334 you can check calibrate and measure all your current signal instruments in a 4 to 20 milliamp DC loop It can be used at any access point in your loop Source amp Read 0 00 to 24 00 mA Simulate a 2 Wire Transmitter or use the Meriam Model M334 to AX simultaneously power your 2 Wire Transmitter and M334 measure its output When desired the Meriam Model M334 can display current in milliamps or percent of 4 to 20 SOURCE MILLIAMPS Calibrate recorders digital indicators stroke valves m arf or any instruments that get their input from a 4 to sonne wD m sanon 20 mA loop Easily set any value quickly to within 0 01 mA with the adjustable digital potentiometer DIAL or use preset 4 00 mA 0 0 and 20 00 mA 100 0 EZ CHECK settings RECALL OUTPUT SETTINGS The EZ CHECK switch provides rapid checking of 4 00 20 00 and any convenient third point between 0 00 to 24 00 mA CALIBRATE USING LOOP POWER Check loop wiring and receivers by using the Meriam Model M334 in place of a 2 Wire transmitter Simulate a changing process input to check loop response and control settings The Meriam Model M334 uses any loop power from 2 to 100V DC READ LOOP CURRENT Check controller outputs or measure the milliamp signal anywhere in the loop The Meriam Model M334 measures 0 0
3. 16 00 mA 50 0 12 00 mA 25 0 8 00 mA 0 0 4 00 mA To convert from Milliamps to Percent Percent Milliamps 4 0 16 To convert from Percent to Milliamps Milliamps Percent 6 25 4 SOURCE READ 2 WIRE SWITCH Select SOURCE to output in milliamps or percent Select READ for reading in milliamps or percent Select 2 WIRE to simulate a 2 Wire Transmitter EZ CHECK SWITCH Instantly output 4 00 mA or 20 00 mA by moving the EZ CHECK switch to the 4 00mA 0 0 position or 20 00mA 100 0 position For fast three point checks select the DIAL position The Meriam Model M334 will remember the last DIAL value even with the power off Note The same DIAL value is stored for both mA and The recalled value will be displayed in the units selected DIAL KNOB Turn the knob to adjust output level Turn clockwise to increase the output counter clockwise to decrease the output EXTERNAL POWER JACK Not Shown When used in conjunction with the optional AC Adaptor the external power jack will eliminate the drain on your batteries This is very handy for applications that require extended use of the Meriam Model M334 Please see the section on Accessories for ordering information Note This feature does not charge the batteries it only supplies power to the Meriam Model M334 CHANGING BATTERIES Low battery is indicated by BAT
4. fixed points of 4 00mA 0 0 or 20 00mA 100 0 with switch Reading Milliamp Outputs READ mA READ Percent of 4 to 20 mA Milliamp Receiver Input Controller Transmitter Computer Choose this function to measure from 0 00 to 52 00 milliamps or 25 0 to 300 0 1 Open the current loop at any conve nient point along the signal path 2 Select mA or 4 to 20mA with slide switch 3 Select Read using slide switch 4 Connect the red input lead of the Meriam Model M334 to the more positive point of the break and the black input Signals below 0 mA or open circuits are indicated by 0 00 mA 25 0 on the display Signals above 52 mA are current limited by protection circuitry Meriam Process Technologies Milliamp Output Signal Controller Transmitter 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Simulate 2 Wire Transmitters 2 Wire mA 2 Wire Percent of 4 to 20 mA Choose this function to simulate a 2 Wire Transmitter output from 0 00 to 24 00 milliamps Operates in loops with power supply voltages from 2 to 100 VDC 1 Disconnect one or both input wires from the device to be cali brated 2 Select mA or 4 to 20mA with slide switch 3 Select 2 WIRE using slide switch 4 Connect the red input lead of the Meriam Model M334 to the plus i
5. 0 to 52 00 mA signals with greater accuracy than a typical multimeter The Meriam Model M334 can be easily switched to display milliamps or percent of 4 to 20 POWER amp MEASURE 2 WIRE TRANSMITTERS The Meriam Model M334 can simultaneously output 24V DC to power any and all devices in a process loop using the internal batteries and the internal switching power supply while measuring the output of a 2 Wire Transmitter and any other loop devices This is handy for checking the functionality of transmitters in the field or on the bench READ DC VOLTS The Meriam Model M334 can measure from 99 99 to 99 99 VDC with 10mV resolution Use it to check loop power supplies I V converters chart recorders 1 to 5 Volt signals and any other voltages within this range making it unnecessary to carry an additional multimeter Meriam Process Technologies 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Copyright 2008 All rights reserved M334 9002 22 July 2008 Basic Operation A Loop alibrator POWER SWITCH Select mA to display and calibrate in milliamps Select 4 to 20 mA to display and calibrate in percent Select READ VDC to read volts DC Return the slide switch to the OFF position when not in use Note Percent mode can also be used with chart recorders valves or current trips that display in percent 100 0 20 00 mA 75 0
6. er will be accurately displayed by the Meriam Model M334 Calibrate the transmitter in the usual manner and disconnect the Meriam Model M334 Meriam Process Technologies 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Read DC Volts READ V Choose this function to measure from 99 99 to 99 99V DC 1 Select READ VDC with slide switch 2 Connect the red and black leads of the Meriam Model M334 across the voltage source to be measured Any DC voltage from 99 99 to 99 99 volts may be measured Loop power supplies signal voltages at receivers batteries and transmitter voltage drops may be measured Signals exceeding 99 99 VDC will be indicated by OVRLD on the display OUT OF RANGE SIGNALS Signals below 0 mA or open circuits are indicated by 0 00 mA 25 0 on the display Signals above 52 mA are current limited by protection circuitry to approximately 54 mA KEEPING THE PROCESS GOING When an instrument in a critical control loop develops a problem it is important to maintain control of the process The Meriam Model M334 can be substituted for a faulty controller or transmitter to provide temporary manual control of the process One technician takes manual control of the process while a second technician retrieves installs and configures a replacement instrument OPEN LOOPS The display will indicate 0 00 mA or 25 0 if there is a
7. n open loop or if the polarity is reversed Check all the connections in the loop or try reversing the leads POWER TRANSMITTER Adjusting the SOURCE output to full scale supplies a nominal 24V DC to power a 2 Wire Transmitter while simultaneously displaying the 4 to 20 mA output of the transmitter Voltage to be Measured jattery Loop Power Supply Transmitter Voltage Drop 1 to 5 Volt Loops Application Notes READ MILLIAMPS Select READ milliamps by moving slide switch to m or 4 to 20mA and moving slide switch to READ Place the Meriam Model M334 in the loop in series with the current to be measured SOURCE MILLIAMPS or 2 WIRE SIMULATOR Select SOURCE using slide switch to output from 0 00 to 24 00 milliamps using the Meriam Model M334 s internal power source This will provide 24V DC Select 2 WIRE to control the current in loop that is using an existing power supply To change the output current adjust the dial knob Turning clockwise will increase the output value turning counter clockwise will decrease the output value The output is adjustable in all EZ CHECK positions When returning to the 4 00mA 0 0 and 20 00mA7 100 positions they will always return to 4 00 0 0 and 20 00 100 0 mA This method is superior to keypad units The zero and full scale positions can be adjusted smoothly making easy valve end stop testing tri
8. nput of the field connections pais and the black lead to the minus Transmitter Disconnected Receiver Powers External 2 Wire Transmitter a a Power Supply 2 to 100 VDC Loop current is adjusted by turning knob while the EZ CHECK switch is in the DIAL position or the current can be set at the fixed points of 4 00mA 0 0 or 20 00mA 100 0 with switch Power amp Measure 2 Wire Transmitters mA OUT OUT Percent of 4 to 20 mA Choose this function to simultaneously supply power to a 2 Wire Transmitter while displaying the 4 to 20 mA output of the transmitter 1 Disconnect one or both input wires from the device to be calibrated 2 Select mA or 4 to 20mA with slide switch 3 Select SOURCE using slide switch 4 Turn the knob clockwise several times until full scale output 24 00 mA 125 0 is obtained this can be verified by clipping the output leads together and checking Sas that the display indicates FULL SCALE syocess Fara 5 Connect the red source lead of the Meriam Model M334 to the plus input of the device and the black source lead to the minus TIN REF rout Typical 2 Wire Transmitter Transmitter Input The Meriam Model M334 supplies a nominal 24 volts DC at 24 mA to the 2 Wire Transmitter The current passed by the transmitt
9. p 20mA lt 0 025 of Span at 4 mA amp 20 mA 0 005mA 0 0 to 24 00 mA lt 0 05 of 24 00mA Span 0 01mA Loop compliance voltage 2 24 DCV 20 00mA Loop drive capability 1200 Q at 20 mA for 15 hours nominal 950 Q with Hart Resistor enabled 334Plus Battery life Source and Power measure mode 2 30 hrs at 12 mA nominal 2 25 hrs with backlight on 334Plus These are internal calibrated cardinal reference points and accuracy is not defined or limited by display resolution Accuracy Overload Current limit protection Loop voltage limits 2 to 100 VDC fuse less protected from reverse polarity connections Battery life 2 125 hours nominal Voltage Read Range and Resolution 99 99 to 99 99 VDC Full Span FS Accuracy lt 0 05 of FS Temperature effect lt 100 ppm C of FS Battery life 2 125 hours nominal Additional Information This product is calibrated on equipment traceable to NIST and includes a Certificate of Calibration Test Data is available for an additional charge Meriam recommends a calibration interval of one year Contact your local representative for recalibration and repair services Meriam Process Technologies 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com
10. p point testing alarm testing etc There is virtually no overshoot undershoot and no automated modes that need to be learned READ DC VOLTS Select READ VDC using slide switch to read volts DC Clip the leads across the voltage to be measured Meriam Process Technologies 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Application Notes SETTING UP VALVES When setting up a valve it is important to correctly set the end stops Use the Meriam Model M334 to supply the 4 to 20 mA control signal to stroke the valve Select SOURCE and the Meriam Model M334 will use the internal power source for outputting current or switch to 2 WIRE SIMULATOR to stroke a valve using any pre existing installed loop power supply as the power source Example 1 Disconnect the 4 20 mA control wires from the Current to Pressure I P converter or the actuator 2 Connect the Meriam Model M334 following the connection diagrams on the prevous pages for Simulate 2 Wire Transmitters 3 Move the EZ CHECK switch to 4 00 mA 0 0 and adjust the fully closed stop on the actuator 4 Turn the Meriam Model M334 s knob slowly counterclockwise and verify that the actuator and valve don t move Repeat steps 3 amp 4 until no movement is detected 5 Move the EZ CHECK switch to DIAL and quickly back to 4 00 mA 0 0 then turn the Meriam Model M334
11. s knob clockwise The actuator and valve should begin to move 6 Move the EZ CHECK switch to 20 00 mA 100 0 and adjust the fully open stop on the actuator 7 Turn the Meriam Model M334 s knob slowly clockwise and verify that the actuator and valve don t move Repeat steps 6 amp 7 until no movement is detected 8 Move the EZ CHECK switch to DIAL and quickly back to 20 00 mA 100 0 then turn the Meriam Model M334 s knob counterclockwise The actuator and valve should begin to move Accessories AC ADAPTOR 200 to 240 VAC Part No 020 0100 AC ADAPTOR 100 to 120 VAC Part No 020 0101 Ni MH 1 Hour Charger w 4 Ni MH AA Batteries Part No 020 0103 Our equipment is warranted against defective material and workmanship excluding batteries for a period of three years from the date of shipment Claims under warrantee can be made by returning the equipment prepaid to our factory The equipment will be repaired replaced or adjusted at our option The liability of Meriam is restricted to that given under our warrantee No responsibility is accepted for damage loss or other expense incurred through sale or use of our equipment Under no condition shall Meriam be liable for any special incidental or consequential damage Meriam Process Technologies 10920 Madison Ave Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Meriam M334 Specifications Unle
12. ss otherwise indicated all specifications are rated from a nominal 23 C 70 RH for year from calibration Keene ce ee eee Operating Temperature Range wei 240 VAC 50 60 Hz Part 020 0101 Optional NiMh Rechargeable battery kit 120 VAC for North America Only charger four NiMh batteries AC amp DC cords Part 020 0103 Low Battery Low battery indication with nominal hour of operation left Protection against misconnection Over voltage protection to 135 vrms rated for 30 seconds or 240 vrms rated for 15 seconds isplay igh contrast graphic liquid crystal display with 0 Display High graphic liquid crystal display with 0 413 10 5 mm high digits M334 Ranges and Resolution 0 00 to 52 00 mA Full Span OR 25 0 to 300 0 of 4 20 mA Accuracy Below 24 01mA 0 05 of 24 00mA 0 01mA Above 24 00mA 0 05 of 52 00mA 0 02mA Voltage burden lt 2V at 50 mA Overload Current limit protection 54 mA nominal Battery life 2 125 Hours nominal st st Meriam Process Technologies 10920 Madison Ave e Cleveland OH 44102 Tel 216 281 1100 Fax 216 281 0228 sales meriam com www meriam com Meraim M334 Specifications continued Unless otherwise indicated all specifications are rated from a nominal 23 C 70 RH for year from calibration Source Power amp Measure Two Wire Transmitters M334 Ranges and Resolution 0 00 to 24 00 mA Full Span or 25 0 to 125 0 of 4 20 mA Accuracy EZ Check s at 4 am
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