American-magnetics 187 Self-Compensating Liquid Level Controller User Manual

MODEL 187 LIQUID LEVELCONTROLLERINSTALLATION, OPERATION, ANDMAINTENANCE INSTRUCTIONSMarch 1998PO Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509, T

viiForewordSafety Summary2.Do not apply heat. Loosen any clothing that may restrict circulation. Apply a sterile protective dressing to the affected a

viiiForewordSafety Summaryrupture disks, etc.) included in the cryostat and top plate assembly are necessary.Recommended Safety EquipmentFirst Aid kit

11 Introduction1.1 Model 187 FeaturesThe American Magnetics, Inc. (AMI) Model 187 Liquid Level Controller system (patent-pending) is an advanced, micr

2IntroductionModel 187 Features1.1.3 Convenient display and direct keypad entryThe instrument is equipped with a 16 x 2 backlit character-mode LCD dis

3IntroductionFront Panel Layout1.2 Front Panel Layout116 character x 2 line LCD display with backlight4HI, A, B, and LO alarm LEDs24 x 4 keypad5FILL

4IntroductionRear Panel Layout1.3 Rear Panel Layout1BNC coaxial connector outputs to sensor5RS-232 (standard) or RS-422 DB-9 female connector2BNC coax

5IntroductionInstrument/Sensor System Diagram1.4 System DiagramSENSOR CABLESRG-59/U COAXIAL 150 FEET MAXIMUM LENGTHFRONT PANELMODEL 187LIQUID LEVELCON

6IntroductionSpecifications1.5 Model 187 Specifications @ 25 °CLevel MeasurementsResolution: 0.1 %, 0.1 cm, or 0.1 inAccuracy: ± 0.5%Linearity: ± 0.2%

72 InstallationWarningBefore energizing the instrument, the earth ground of the power receptacle must be verified to be at earth potential and able to

8InstallationInstalling the sensor2.2 Rack Mounting the Instrument If the instrument has a rack mount chassis, follow the following procedure:a.Attach

Model 187 Liquid Level ControllerModel 187 ConfigurationAMI Order Number:_____________________Shipping Date:_________________________Model 187 Serial

9InstallationConnecting the sensor cables2.4 Connecting the Model 187 to the SensorNoteThe electrical characteristics of the interconnecting coaxial c

10InstallationConnecting the sensor cablesincluded with the liquid level sensor packaging to reduce the possibility of this occurring. If the sensor i

11InstallationVerifying power requirements2.6 Connecting the Instrument to PowerWarningThe Model 187 operates on 50-60 Hz power and may be configured

12InstallationVerifying power requirements

133Operation3.1 Operational GuidelinesThis section describes the front panel display and kepad functions for the Model 187. In addition to the front p

14OperationOperational Guidelines3.1.2 Selecting the Appropriate UnitsRepeatedly press the key to cycle between display units of percent, inches, or

15OperationOperational Guidelines3.1.4 Configuring the HI and LO AlarmsTo adjust the HI and LO alarm levels, use the HI and LO menus accessible by usi

16OperationOperational Guidelinesc.In addition to the LED functions, the controller output receptacle may be energized and de-energized as discussed i

17OperationSensor contamination The fill timeout feature is enabled when the instrument is operated in the AUTO mode with a fill timeout setting great

18OperationMenu Reference3.3 Menu ReferenceThe default display is illustrated in Figure 3-2 below. The default display provides the level measurement

19OperationMenu ReferenceIf the key is pressed once while entry is initiated, the entered digits will be cleared and the cursor will remain for reent

20OperationMenu ReferenceThe LO alarm may be set between 0.0% to 100.0%. The default setting is 20.0%.3.3.4 A MenuAccessible by pressing the key. The

21OperationMenu ReferenceThe RATE alarm may be set up to 9,999.9% per minute. The default value is 10.0% per minute.3.3.7 LEN (Length) MenuThe LEN men

22OperationMenu Reference3.3.8.1 Fill ModeThe fill mode menu provides three options for the fill mode of the Model 187. Press the key to cycle betwee

23OperationMenu Referenceremote interface, and the serial remote interface. Consult Section 4 for more information regarding the communication interfa

24OperationMenu Reference3.3.10.5 Serial Stop BitsSpecifies the number of stop bits for the serial interface. Use the key to cycle between values. Th

25OperationMenu ReferenceAfter entry of the correct passcode and the is pressed, the calibration selection menu will appear as shown below:The key c

26OperationMenu Reference

274 Remote Interface ReferenceThe Model 187 provides the capability of supporting RS-232 and IEEE 488.2 compliant interfaces simultaneously. Upon requ

28Remote Interface ReferenceSCPI Command Summary(see page 41 for more information)*STB?*SRE <enable_value>*SRE?*CLS*ESR?*ESE <enable_value>

iTable of ContentsForeword... vPurpose and Scope...

29Remote Interface ReferenceSCPI Command Summary(see page 44 for more information)LEVel?USAGe?(see page 44 for more information)CONFigure:LENgth:ZERO

30Remote Interface ReferenceSCPI Introduction(see page 46 for more information)UNITs {0|1|2}PERCentINchesCMUNITs?4.2 Programming OverviewThe Model 187

31Remote Interface ReferenceSCPI Status SystemA condition register continuously monitors the state of the instrument. The bits of a condition register

32Remote Interface ReferenceSCPI Status Systemenable register. To enable or disable bits in an enable register, write a decimal value which correspond

33Remote Interface ReferenceSCPI Status SystemBit 1 of the Status Byte register, indicating that the controller output is energized, remains set until

34Remote Interface ReferenceSCPI Status System4.2.2.3 Reading the Status Byte using *STB?The *STB? returns the contents of the Status Byte register, b

35Remote Interface ReferenceSCPI Status System4.2.4 Alarm RegistersThe Alarm register group reports the present condition of all alarms in the Alarm C

36Remote Interface ReferenceCommand HandshakingThe Alarm Event register is queried using the STATus:ALARm:EVENt? command.The Alarm Event enable regist

37Remote Interface ReferenceCommand Handshaking4.2.5.1 Using the *OPC CommandThe *OPC command is executed within the normal command queue. Upon comple

38Remote Interface ReferenceRS-232/422 Configuration4.3 RS-232/422 ConfigurationThe Model 187 allows several parameters related to the RS-232/422 inte

iiTable of Contents3.2Sensor contamination...173.3Menu Reference...

39Remote Interface ReferenceIEEE-488 Configurationtransmission. The Model 187 can accept <CR>, <LF>, <CR><LF>, or <LF>&l

40Remote Interface ReferenceSystem-Related Commands4.4.2 Device ClearThe Device Clear is a low-level IEEE-488 bus message which you can use to return

41Remote Interface ReferenceStatus System CommandsSYSTem:LOCalEnables all front panel controls. All front panels controls are enabled by default after

42Remote Interface ReferenceStatus System Commands*ESE <enable_value>Enables bits in the Standard Event register to be reported in the “Standard

43Remote Interface ReferenceAlarm Configuration Commands and Queriessum of the bits you wish to enable. Refer to Table 4-3 on page 36 for more informa

44Remote Interface ReferenceLevel and Usage QueriesALARm:RATE?Returns the RATE alarm value in the presently selected remote units per minute.CONFigure

45Remote Interface ReferenceFill Mode Control and QueriesCONFigure:LENgth:SPAN <measured_span>Configures the measured span above the “zero point

46Remote Interface ReferenceRemote Units Commands and QueriesCALibration:SELect {0|1} or {USER|FACTORY}, <cal_passcode>Selects between the USER

47Remote Interface ReferenceError Messages1,”INCHES” is returned if the remote units are inches.2,”CM” is returned if the remote units are centimeters

48Remote Interface ReferenceError Messages4.6.1 Command Errors-101,"Unrecognized command"The command string sent was not identified as valid

iiiTable of Contents4.3.3Flow Control Modes...394.4IEEE-488 Configuration...

49Remote Interface ReferenceError Messages4.6.2 Query Errors-201,"Unrecognized query"The query string sent (identified as a query by a ?) wa

50Remote Interface ReferenceError Messages-404,"Serial data overrun"The received buffer of the Model 187 was overrun. Either switch to softw

515 Service5.1 Model 187 MaintenanceThe Model 187 was designed and manufactured to give years of reliable service. The only routine maintenance requir

52ServiceTroubleshooting Hints5.2.1 The Model 187 does not appear to be energized with the power switch in the ( ) position.1.Ensure that the Model

53ServiceTroubleshooting Hintsd.Replace the fuse and securely fasten the instrument top cover. Reconnect the power-cord.3.Verify the input voltage sel

54ServiceTroubleshooting Hints5.2.3 The Model 187 displays “Over/Under Flow”.1.The vapor and liquid reference plate sensors are either both submerged

55ServiceTroubleshooting Hints5.2.6 The liquid level unexpectedly rises rapidly as the tank level approaches 0%.1.The liquid reference plate sensor is

56ServiceReturn Authorizationcards that have introduced communication errors. AMI attempts to establish compatibility with as many products as possibl

57AppendixA.1 4-20 mA Current Loop OptionThe 4-20 mA output utilizes pins 2 and 4 of connector J8. When the Model 187 is configured for the 4-20 mA cu

58AppendixAuxiliary connector J8 pinoutA.2 Auxiliary Connector J8 PinoutThe HI level and LO level contacts are provided for external use by the custom

ivTable of ContentsAppendix...57A.14-20 mA Current Loop Option...

59AppendixIEEE-488 ConnectorA.3 IEEE-488 ConnectorTable A-1. IEEE-488 female connector J7 description.Pin Mnemonic Description1 DIO1 Data In/Out Bit 1

60AppendixRS-232/422 ConnectorA.4 RS-232/422 ConnectorTable A-2. PC (DB-25)-to-Model 187 connections for RS-232 operation.PC (DTE)DB-25 PinModel 420 (

61AppendixRS-232/422 ConnectorTable A-4. EIA-530 Device-to-Model 187 connections for RS-422 operation.EIA-530 Device (DTE)DB-25 PinModel 420 (DCE) DB-

62AppendixRS-232/422 Connector

63IndexAAMI Internet e-mail address 56AMI WWW address 56applicable hardware viaudible alarm 13, 22Ccalibration 24medium 25passcode entry 24perfor

64IndexRrack mounting 8rear panel layout 4remote interface reference 27alarm registers 35command conventions 27command handshaking 36command ref

vForewordPurpose and ScopeThis manual contains the operation and maintenance instructions for the American Magnetics, Inc. Model 187 Liquid Level Cont

viForewordApplicable HardwareApplicable HardwareThe Model 187 has been designed to operate with an AMI Liquid Level Sensor. Operation with other equip