User`s Manual
Contents
1. 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 13 For Domestic and Industrial tanks r1 3 b Connection Detail for Rochester Remote Sender The Rochester Remote gage 2 parts 1 e the plastic Direct Read dial Face and the Sensor Element that snaps into the Dial Refer to diagram below for connection details Channel 1 Channel 2 Red TBI TopLevel 7 TBI Bottom Level 7 TB1 Top Level 6 TBI Bottom Level 6 TB1 Top Level 5 TBI Bottom Level 5 Red Rochester White Black Sender CH1 Red Rochester White Sender CH2 EUM E s35 lg gt gt g CL 35 S65 gt Fe E E E 5 335235 Sed edad amp farte PENE Bottom Level oda zzz ooo Auxiliary Power CH2 Sensor Input CH2 Sensor Power CH2 LI LL ras a KI N A ro D j Pi HC 10210 Monroe Dr Dallas TX 75229 _ CFO esign C Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 14 For Domestic and Industrial tanks r1 3 Jumper Settings for Rochester Remote LPG Sender g o 3 B LI e o o o o o j li 000 6660009 9Rni 9 9 9f s 0 0 0 0 9 060600000109 9 o o 9 o o o eolRi3le se o o US RN2 a 919 9 erase 9 9 o Ri4jJo rol 09 O17 4 O 0 o 0 R7 Yo o 2 kz le OS cis ajojo o o R8 fo o old ol Ri lo PAP o 0 R3 4 0 9 olnizlo KC o o 01 RE o0 o 9 o 0 R4 fo o wal2. A 1 Unit is installed but will not show anything on the display a Check power Make sure that Power 10 24 VDC is connected to TB1 VIN and Power to TBI GND If 120 VAC transformer is used make sure Wire marked 12VDC is connected to TBI VIN and the other wire 1s connected to TB1 GND b Make sure that the sender is properly connected to TB1 SN1 and TB1 GNDI for sensor 1 and TB1 SN2 and TB1 GND2 for sensor number 2 c Check and verify that the control board inside the controller is not damaged or scratched 2 Unit will not trip on a low level condition a Check and make sure that the Low Level Alarm Set Point is set correctly Refer to Set Point Programming section in this manual 10210 Monroe Dr Dallas TX 75229 M icro Desi n Inc Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 Notes SS Micro Desi in Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 28
3. If you have any questions regarding this manual or this product please call or write to the following Please respond to Micro Design Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 Internet Home page www micro design com i aT OO QAGGOGGHdHGaecL I Sr Micro Desi n Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 4 For Domestic and Industrial tanks r1 3 Table of Contents AA AA 5 Aa Na AA AA 6 ONSA a AA AA AA 6 cud CUP NAA AA AA AA 7 3 Analog Outputs agccccxcsegasenacancssacsnnosanceerssatesspnseniaraessnesenassnsvaissaniseandsiintanesaesbnne i aeeameteaeead aaesaaeeaaea meets 8 4 Connection Details M m 11 a Jumper settings for using MDi Sensors PN 944417 or PN 94441820000 ccccccccessseeeeeeeeeeeeeeeeeeees 1 b Connection Detail for Rochester Remote Sender 1 cccccseccceecceeccescceeccesccecceescseusceeeseenseees 13 c Connection Detail for an external 4 20mA Signal Remote Sender 11117 a 15 5 48 VDC Power Source Connection Detaills 0 110001100000102020 1 0 eene nennen nennen 17 For locations that have 48 Volts DC power source the units needs to be isolated so that the correct DC voltages are applied to power the unit and the sensor Connect the 48 VDC supply as shown in picture DOLON AA 17 PC Connections using RS2
4. SENDER AT THE TANK YET Locate the place where the monitor is to be installed Drill four holes according to the dimensions shown in figure 7 Remove the lid of the monitor undo 4 corner screws Mount the monitor using the appropriate screws to fit through the feed through holes on the four corners Temporarily connect the two sender wires directly to the monitor TBI GNDI and TBI SNI It does not matter which sender wire 1s connected to which TB3 terminal refer to fig 1 Connect Relay contacts and Analog outputs as desired Refer to figure 3 for connection details Connect power to the monitor either using the supplied 120 VAC transformer or a 10 24 VDC power source supplied by the user Refer to figure 1 for connection details APPLY POWER TO THE MONITOR The sender level can be changed manually by holding a small magnet at the bottom of the sender and rotating 1s clockwise or counter clockwise such that the orange pointer in the sender follows the magnet Observe the appropriate Level reading on the LCD display L1 or L2 It should follow the LPG level indicated by the orange pointer Set the Low and High set points using the 5 pushbuttons as described in set point programming section above When the level on the sensor is blow the low set point or above the high set point the corresponding alarm relay will activate and the offending set point will blink on the display Disconnect power to the unit and the LPG sender Install sender
5. US RN2 9 ohyo o 9 9 o Risto xeJj eo e9ci 00 o o1 R7 Yo o of R2 te 05 cis z o jo o R8 fe o lolo Ri te 4 0 o o 01 R3 f o o nito o x O o o ol RE Polo o e o o R4 o o o 6 61 r9 o 099 otz e WV E an 9 po F 9 o 9 9 No Jumper Micro Desion In 10210 Monroe Dr Dallas TX 75229 CFO S 3 C Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 17 For Domestic and Industrial tanks r1 3 5 48 VDC Power Source Connection Details For locations that have 48 Volts DC power source the units needs to be 1solated so that the correct DC voltages are applied to power the unit and the sensor Connect the 48 VDC supply as shown in picture below 48 VDC 48 VDC 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 18 For Domestic and Industrial tanks r1 3 PC Connections using RS232 Serial Interface a RS232 serial port 1 connection and operation DEV port This serial interface port can be connected to a PC using MDi cable mdi 232 10 Using communication programs such as Microsoft HyperTerminal the user can set alarm set points view current levels change signal type etc The unit port is set to operate at 9600 BAUD 8 data bits 1 stop bit no parity and no handshake It is a simple 3 wire interface i e transmit receive and ground Once the cable is
6. decrease direction can be changed by pressing SW5 momentarily c Programming Tank 2 Low Set Point This set point is programmed by pressing the blue push button marked SW3 The low Set point for LI will either increase of decrease Set it to the desired value and the unit will automatically save it The increase decrease direction can be changed by pressing SW5 momentarily d Programming Tank 2 High Set Point This set point is programmed by pressing the blue push button marked SW4 The High Set point for LI will either increase of decrease Set it to the desired value and the unit will automatically save it The increase decrease direction can be changed by pressing SW5 momentarily e Programming Sensor type There are 2 types of sensors MDi 2 wire and Rochester 3 wire They can be set by holding down the red button SW5 and pressing SW1 to change value on the top line for channel 1 and SW2 to change value on the second line for CH2 A value of 0 sets the unit to operate with the MDi 0 1000 2 wire sensor A value of 1 sets the unit to operate with the Rochester Hall Effect 3 wire sensor LCD Display mmm Figure 8 10210 Monroe Dr Dallas TX 75229 add LCF 0 D ESILSI In C Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 23 For Domestic and Industrial tanks r1 3 Hardware Installation 1 2 3 4 5 6 7 9 10 11 Micro Design Inc DO NOT INSTALL THE
7. 32 Serial Interface 1111111111111000000020202 2 2 Ka 18 a RS232 serial port 1 connection and operation DEV patt 111117 a 18 b RS232 serial port 2 connection and operation COM Ppolt cccccssssesseeceeececeeeesseseccecesessaaeesseeeeees 20 Programming Low and High Set Points sse nn nnn nnne nennen eene nnns 22 Hardyare RNS EA AU ON ET AA 23 Monitor mounting dimensions 1 1111111111111 a 24 Monitor Specifications a sat sa NANANA NANA DAO ANDA GG 25 PA AA 26 Most frequently asked questions and answers Q amp A 111111111707077777 aa 2j 10210 Monroe Dr Dallas TX 75229 M icro Desi n Inc Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 5 For Domestic and Industrial tanks r1 3 Features The 94442A Stationary Tank Monitor STM is used for measuring LPG level in a tank It can be installed indoors or outdoors at a convenient location that can be up to 1000 feet from the tank A level sender is also included which must be installed in the float gage located on the tank The LPG tank does not have to be emptied or purged to install the sender It s universal design fits most junior and senior LPG float gages and includes a direct read pointer that can be used to indicated LPG level at the tank e Monitors 2 LPG Tank Levels Sensor for second tank optional e State of the art intelligent microprocessor based electronics e Large LCD readou
8. 99 4 97 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 Micro Design Inc LPG Stationary Tank Monitor PN 94442A LPG H For Domestic and Industrial tanks r1 3 4 Connection Details a Jumper settings for using MDi Sensors PN 944417 or PN 944418 Channel 1 Channel 2 TBI Top Level 6 TBI Bottom Level 6 TBI Top Level 5 TBI Bottom Level 5 ll White MDi Sender CH1 Black White MDi Sender CH2 Black E 53 3 5 Emm min H 2 a gt Sensor Input CH1 Sensor Power CH1 Top Level Bottom Level o T md Cd C a MR GC LI 55 a 3 o Ag CL y Oo gt 6 a Ga x a 3 mi 0a maa Car _ iii E E Micro D on IH 10210 Monroe Dr Dallas TX 75229 CFO est C Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 12 For Domestic and Industrial tanks r1 3 Jumper Settings for MDi Sensors PN s 944417 and 944418 o 3 J LI e o o o 0009 o i p 000 in 5 0 0 b 6 0 0 6 o 0 0 e 9 00000 0 OJRNI 3 U2 pa 666666 0 6 9 o 0 o o o o elRni3le fe o 9 US RN2 al 919 o ohio O 9 9 o Risto rol 600 O17 zo lo oLR7 Loc eOe EHe 05 cie z o lo o R8 f o loldotRi lo e 2 e le 9 9 R2 la o 9 alpisto M e o e of R6 joo lo Glo o o RA fo o o 6 01 r9 m gt esa oo Ao o No KI t BTI E R le ee Figure 3B
9. Edit view Call Transfer Help De 2 5 s085308040800000 bd Connected 0 00 22 Auto detect 9600 8 1 1 SCROLL CAPS NUM Capture Print echo 2 Figure 6 S a M cr r Ion In 10210 Monroe Dr Dallas TX 75229 _ CFO est C Tel 972 488 8725 Fax 972 488 8724 21 LPG Stationary Tank Monitor PN 94442A LPG 22 For Domestic and Industrial tanks r1 3 Programming Low and High Set Points There are 5 pushbuttons on the main board that are used to program the set points Four pushbuttons are blue and are marked SW1 SW2 SW3 and SW4 form left to right The fifth pushbutton is red and is marked SW5 and is used to change the direction of the Set Point count when being programmed by the other pushbuttons as described below Only one set point must be modified at a time 1 e pressing SW1 SW4 at the same time may result in error Refer to figure 8 below for details a Programming Tank 1 Low Set Point This set point is programmed by pressing the blue push button marked SW1 The low Set point for L1 will either increase of decrease Set it to the desired value and the unit will automatically save it The increase decrease direction can be changed by pressing SW5 momentarily b Programming Tank 1 High Set Point This set point is programmed by pressing the blue push button marked SW2 The High Set point for L1 will either increase of decrease Set it to the desired value and the unit will automatically save it The increase
10. LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 User s Manual REV 1 4 PG STATIONARY TANK MONITOR This Manual belongs to Company lt 1 IC ro i J es ig F l I Hc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 2 For Domestic and Industrial tanks r1 3 Proprietary Notice This document and its contents are proprietary to Micro Design Inc and shall not be reproduced copied or used in whole or in part without the written consent of an officer of Micro Design Inc This document is for information purposes only and is subject to change without notice Thank You Micro Design Inc thanks you for purchasing this product and hopes that it can fulfill all your needs now and in the future 10210 Monroe Dr Dallas TX 75229 AA icro Dest n Inc Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 Revision History Version Page Date Reason 1 0 10 18 2004 Initial Release 1 1 01 14 2006 Added multiple sender setting details and updated Serial menu 1 2 02 28 06 Added 48 VDC connection details 1 3 08 31 06 Added 4 20 mA Output option details 1 4 05 16 06 Added Rochester sender details Please Note Micro Design Inc encourages and appreciates customer feedback regarding errors or improvements for this document
11. Sender type and output details Analog Output CH1 Analog Output CH2 z 5 L z 5 0 5VDC Output VDA2 Auxiliary Power CH1 Sensor Input CH1 Sensor Power CH1 Top Level Bottom Level GND Auxiliary Power CH2 Sensor Input CH2 Sensor Power CH2 10210 Monroe Dr Dallas TX 75229 M icro Desi n Inc Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 Analog Output for MDi Sensors PN 944417 or PN 944418 Level 096 10 12 15 18 21 20 30 35 40 45 50 54 56 62 68 11 19 80 85 90 95 100 Micro Design Inc Volts 0 00 0 48 0 57 0 73 0 89 1 03 1 24 1 47 1 72 1 97 2 22 2 48 2 51 2 58 2 67 2 11 3 06 3 37 3 51 3 2 3 96 4 21 4 21 O a 2 gt STM 94442A Analog Output Level Figure 3 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 Analog Output for Rochester Remote Sender Yo Analog Level Output VDC 0 0 00 5 0 25 Rochester Sender 10 0 50 15 0 75 20 1 00 6 00 25 1 25 30 1 50 5 00 35 1 75 40 2 00 4 00 45 2 25 3 00 50 2 50 55 2 75 200 60 3 00 65 3 25 1 00 70 3 50 75 3 75 0 00 80 4 00 o o o o o o o o o o o S S ph ge SS q uso qo qo gi 9096 4 50 A 95 4 75 o Level
12. connected from the PC com port to the unit s DEV port press enter on the HyperTerminal window and the unit will respond with a menu This menu is self explanatory and as mentioned parameters can be set changed per user s requirements Figure 5 below shows details of the HyperTerminal window with the unit menu com1_9600 HyperTerminal E B x File Edit view Call Transfer Help Dis 9 8 Hbi LPG STH 3444274 rev O 0 Mero Desiqn Inc l zl0 Monroe Dr Dallas TH 7b5zz393 Tel 372 455 8725 Fax 972 488 8725 www micro design cormnm Today s Date FF FF FF Time FF FF IFF LPG Tank 1 level 30 LPG Tank zZz level 35 Low Set Point 05 Low Set Point 40 Hi Set Point aus Hi Set Point 205 Input Signal Hbi Sensor Input Signal Mbi Sensor Date Time Signal Type LEGl Hi LPCl Lo LPE Hi LFGZ Lo 1 7 Figure 5 Mi F n I H Ini 10210 Monroe Dr Dallas TX 75229 ICFO 17ES C Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 Selection 3 Set Sensor Signal Type This 1s used for setting the type of sensor that is being connected to the STM O MDi Sensor PN 944417 or PNE 944418 all Rochester Remote Sensor TE 4 20 mA Sensor Select 3 on Main Menu may have to press 3 twice Enter 1 1 Unit does echo this entry so it will not show on the screen The unit will go back to Main Menu and shou
13. e Monitor operating temperature Monitor electrical rating 10 to 150 F Class 1 Div 2 groups C amp D Note Typical use of this monitor would be in conjunction with senders installed in Domestic tanks of less than 1000 Ibs water capacity It can be used tanks at residential commercial and industrial locations where LPG 1s dispensed from the tank at 15 feet away 1n all directions from the tank Micro Desi n Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 26 For Domestic and Industrial tanks r1 3 Sender Specifications Mdi part no 94417 Resistance range 0 1000 Ohms Operating Voltage range 0 24 Volts DC max Power rating 0 125 Watts Operating temperature 40 to 70 C 40 to 158 F Enclosure Sealed Lexan top and bottom Ultrasonically welded Electrical specification When used with STM PN s 94440 94441 94442 94442A 944450 and 944452 Class 1 Div 2 groups C amp D When used with STM PN s 944443 and 94501 installed with Intrinsically Safe Barriers STAHL 9001 02 093 150 00 or equivalent Class 1 Div 1 groups C amp D MEL LLL u o EU OO QAGGOGGHdHGaecL I a Micro Design Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 21 For Domestic and Industrial tanks r1 3 Most frequently asked questions and answers Q amp
14. e 9 9 o od e i m59 on oS ae Ki BTI E ee No Jumper Figure 4B 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 c Connection Detail for an external 4 20mA Signal Remote Sender Channel 1 Channel 2 TB1 Top Level 7 TBI Bottom Level 7 TBI Top Level 6 TBI Bottom Level 6 TBI Top Level 5 TBI Bottom Level 5 A 3 wire or a 2 wire 4 20 mA signal from an external device can be connected to the STM The figure below shows connections for a 3 wire 4 20mA transmitter In a 2 wire transmitter the GND line is not connected Power Signal GND Connection Details Power Red for 3 wire 4 20 mA White LPG level sender Signal p GND Black E 7 aa ni aao LE c mu 3 m eS J x xm amp 2 SSO PF 2a 3088155 GG 525 5 odao0oxu Top Level m 123465 Bottom Level Sensor Input CH2 Sensor Power CH2 C I e a 3 CL m E z ef 10210 Monroe Dr Dallas TX 75229 AA icro Dest n Inc Tel 972 488 8725 Fax 972 488 8724 15 LPG Stationary Tank Monitor PN 94442A LPG 16 For Domestic and Industrial tanks r1 3 Jumper Settings for 4 20mA Signal LPG level Senders 2 IJ ix o ng LI e o po oo 9 5 i o 900 0 6 nf lee 0 0 5 6 0 10 9 200000 9JOjFNI 3 U2 M o000009 9 9 o 0 o o o o of RIi3he fe o 9
15. ld show sensor type to be 0 5 Volts DC If it does not repeat entry again MEL LLL u o EU OO QAGGOGGHdHGaecL I a Micro Design Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 19 LPG Stationary Tank Monitor PN 94442A LPG 20 For Domestic and Industrial tanks r1 3 b RS232 serial port 2 connection and operation COM port This serial port is connected the same as port 1 using MDi cable mdi 232 10 The port is also to operate at 9600 BAUD 8 data bits 1 stop bit no parity and no handshake It continuously sends out a data packet as shown in figure 6 below This port 1s primarily used to connect to a PC or a Remote Terminal Unit RTU to retrieve live tank level data for use in other monitoring systems Data Packet 0395308040800000 Header ASCII character 80 Tank 1 High Level Alarm Set Point S 40 Tank2Low Level Alarm Set Point 80 Tank2HighLewlAlarmSetPoint O U OO 00 Tank 1 Sensor Type 0 MDi Sensor 1 0 5 VDCand2 4 20m 00 Tank 2 Sensor Type 0 MDi Sensor 1 0 5 VDC and2 4 20mA MEL LLL u o x00 aT OO QAGGOGGHdHGaecL I Sr Micro Desi n Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 RS232 Serial Port 2 COM port HyperTerminal Screen Shot s coml 9600 HyperTerminal File
16. on the LPG tank Install and connect the cable between the sender and the monitor Any 2 conductor shielded 16 to 22 awg mult strand multi conductor cable can be used for this purpose NOTE if this cable is not installed in a conduit then be sure to select a good outside grade cable that can be used for direct burial if necessary Apply power to the unit and make sure that the monitor 1s displaying the correct LPG level observed at the tank 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 Monitor mounting dimensions Figure 7 Enclosure Mounting Dimensions 6 18 O 00000 NY az pa Micro Desicn In 10210 Monroe Dr Dallas TX 75229 CFO esl C Tel 972 488 8725 Fax 972 488 8724 24 LPG Stationary Tank Monitor PN 94442A LPG 25 For Domestic and Industrial tanks r1 3 Monitor Specifications Power A C Transformer Input Output Output Current Monitor Input Power Monitor Current Consumption Sender Output Maximum output voltage to sender Maximum output current to sender Alarm Relay specifications 2 Form C contacts rated at Analog output Volts Output current Enclosure 120VAC 12 Volts DC 0 2 Amps 10 24 Volts DC 0 25 Amps max 5 Volts DC 10 mA 5 Amps each 0 5 Volts DC 20 mA max NEMA 4x sealed weather proof designed for indoor or outdoor us
17. t indicating Level Low Set Point and High Set Point for each channel e Hi Lo alarm set points programmable using built in pushbuttons e One Form C NC N NP contact available for each channel Contact rating 120VAC 3 Amps e Analog Output for each channel 0 to 5 VDC standard 4 20 mA optional e RS232 Serial Interface for direct connection to PC RTU or PLC e NEMA 4 enclosure suitable for outdoor use e Operated on 12 to 24 VDC power Includes 120 VAC wall transformer for AC operation e One LPG sensor included to fit standard 2 junior float gage 10210 Monroe Dr Dallas TX 75229 M icro Desi n Inc Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 6 For Domestic and Industrial tanks r1 3 Product Overview The monitor contains the following 1 LCD Display Figure 1 indicates LPG level and corresponding Low and High Set points for 2 individual tanks Top Line indicates parameters for Tank 1 and second line for Tank 2 LCD Display Low Set Point Level Blue PB 1 High Set Point Blue PB 2 m L1 62 Lo30 HI80 x2 gt L2 XX Lo30 HI80O iure XX No Sensor Figure 1 Low Set Point Blue PB 3 MEL LLL u o OO QAGGOGGHdHGaecL I Sr Micro Desi n Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG For Domestic and Industrial tanks r1 3 2 Alarm Relay An alarm rela
18. y is available for each channel that provides a Form C NC C NO contact rated at 120 VAC at 3 Amps The alarm is activated whenever the actual tank level is either lower than the LO set point or higher than the HI set point The relay is de activated when the level is restored within the normal operation range Figure 2 below show connection details for the contacts ERFRE FREE N EEF FEEFEE FEN FEEFEE EEE E E HC MORMALLY CLOSED HO NORMALLY OFEN D Umsazzd s ZISIS sangang ne LLE LL H dLa T aj y H NG C NC NO C NC TANK 1 TANK c ALARM ALARM CONTACT RATING 3 AMPS 120W AL Figure 2 Micro Desi n Inc 10210 Monroe Dr Dallas TX 75229 Tel 972 488 8725 Fax 972 488 8724 LPG Stationary Tank Monitor PN 94442A LPG 8 For Domestic and Industrial tanks r1 3 3 Analog Outputs A 0 5 Volt analog output is also provided for each channel This output is typically used to connect to a remote monitoring device programmable controller etc in order to access LPG tank levels For Channel connect to TB1 Top Level2 and TB1 Bottom Level2 and for Channel 2 connect to TBI Top Level3 and TB1 Bottom Level 3 refer to figure 4C below Figure 3 shows a graph of the analog output verses the LPG level This output can be connected to a signal conditioner to provide a 4 20 mA signal indicative of the LPG level Refer to figure 4 for more details on connection to external devices Refer to Figures 3 and 4 for
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