Instruction/ maintenance manual of the product 240-VT Sierra
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Series 24-HP Instruction Manual Table of Contents IM-24-HP 0-1 Sierra Series 240 and 241 Innova -Mass™ Multi-Paramete r V ortex Mass Flow Meters Models 240-VT, 240-VTP, 241-VT, 241-VT P Instruction M anual Part Number: IM-24-HP, Rev.
Table of Contents Series 24-HP Instruction Manual 0-2 IM-24-HP Customer Notice Unless you have specifically ordered Sierra’s optional O 2 cleaning, this flow meter may not be fit for ox y g en service.
Series 24-HP Instruction Manual Table of Contents IM-24-HP 0-3 T able of Contents Chapter 1 Introduction Innov a-Mass™ Vortex Mass Fl ow Meters.......................................... 1-1 Using this Manual .........................................
Table of Contents Series 24-HP Instruction Manual 0-4 IM-24-HP E nergy Menu ....................................................................... 3-10 Fluid Menu .................................................................................. 3-11 Units Menu .
Series 24-HP Instruction Manual Table of Contents IM-24-HP 0-5 Figures 1-1. In- Line V ortex Multi-Parameter Mass Flow Meter ............... 1-3 1-2. Measurement Principle of Vortex Flow Meters ..................... 1- 4 1-3. Reynolds Num be r Rang e of the I nnova-Mass .
Table of Contents Series 24-HP Instruction Manual 0-6 IM-24-HP W arnings and Cautions Warning! Agency approval for hazar dous location installations varies between flow meter models. Consult the flow meter na meplate for specific flow meter appro vals before any hazardous location installation.
Series 24-HP Instruction Manual Chapter 1 Introduction IM-24-HP 1-1 Chapter 1 Introdu ction Innova-Mass ™ Multi -Parameter V ortex Mass Flow Meters The Sierr a I nstr um ents’ Series 240 I n-Line and the Series 241 Insertion Innov a-Mass™ V ortex Flow Meters provide a reli able solution for proc- ess flow measurement.
Chapter 1 Introduction Series 24-HP Instruction Manual 1-2 IM-24-HP Note and Safety Information We use note, cauti on and warning statem ents throughout this book t o draw your attention to i m porta nt information. Warning! Caution! Note This statement appears w ith information that is impor tant to protect people a nd equipment from damag e.
Series 24-HP Instruction Manual Chapter 1 Introduction IM-24-HP 1-3 How the Innova-Ma ss V o r tex Mass Flow Meter Operates Figure 1-1. In-Line Vortex Multi-Parameter Mass Flo w Meter Sierra Seri es 2.
Chapter 1 Introduction Series 24-HP Instruction Manual 1-4 IM-24-HP Vortex Shedding Freque ncy Von Karman vortices form downstream of a shedder bar int o two dis- tinct wakes. The vortices of one wak e rotate clockwise while those of the other wake rotate count erclockwise.
Series 24-HP Instruction Manual Chapter 1 Introduction IM-24-HP 1-5 Re = ρ V D µ St = f d V Flow Velocity Ra nge To ensure t rouble- f ree operation, vortex flow meters must be correctly sized so that the f low v el ocity rang e through the meter lies within t he measurable velocity range (with acceptable pr essure drop) and the linear range.
Chapter 1 Introduction Series 24-HP Instruction Manual 1-6 IM-24-HP As shown in Figure 1-3, I nnova-Mass™ meters exhibit a const ant Strou- hal number across a large range of Reynolds numbers, indicating a con- sistent l inear output over a wide range of flows and fluid t y pe s.
Series 24-HP Instruction Manual Chapter 1 Introduction IM-24-HP 1-7 Pressure Meas urement Innov a-Mass Flow Meter s incorporate a solid-state pres sure transducer isolated by a 316 stai nless steel diaphragm. The transducer i tself is mi- cro-m ac hined silicon, fabricat ed using integrated circuit proces sing tech- nology.
Chapter 1 Introduction Series 24-HP Instruction Manual 1-8 IM-24-HP Flow Meter Electronics Innov a-Mass Flow Meter electronics are availabl e m ounted di rectly to the flow body, or remotely m ounted. The ele ctronics housing may be used indoors or out doors, including wet environm ents.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-1 Chapter 2 Ins tallation Installation Overview Sierra’s Innova- Mass Vort ex Flow Meter installat ions are simple and straightforward. Both t he Series 240 In- Line and Seri es 241 I nser tion type flow meter installa tions are covered in this chapter .
Chapter 2 Installation Series 24-HP Instruction Manual 2- 2 IM-24-HP Unobstructed Flow Re quirements Select an inst allation site tha t will m inimize possible distort ion in the flow profile . Valves, elbows, control valves and other piping components may cause flow distur bances.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-3 Series 240 In-Line Flow Meter Installation Install the Series 240 In-Line Flow Meter between two conventional pipe flanges as shown in Figures 2-3 and 2- 4.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 4 IM-24-HP Wafer-Style Flow Meter Installation Install the wafer-style meter between two conventional pipe flanges of t he same nom i nal size as the flow meter. If the process fluid is a l iquid, m ake sure the meter is loca ted where the pipe is always full.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-5 Flange-Style Flow Meter Installation Install the flange-style m eter between two conventional pipe flanges of the same nominal size as the flow meter. If the process fluid is a liquid, mak e sure the meter is loca ted where the pipe is always full.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 6 IM-24-HP Series 241 Insertion Flow Meter Installation Prepare the pipe line for installa tion using either a cold tap or hot tap method described on the foll ow ing pages. Refer to a standard code f or all pipe tapping operati ons.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-7 Cold Tap G uidelines Refer to a standa rd code for all pipe tappi ng oper ations. The following tapping instructi ons are general in nature and inte nded for guideline pur- poses only.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 8 IM-24-HP Hot Tap Gui delines Refer to a standard code for all pipe tapping operations. The fol lowing tapping i nstructions are general in nature and intended f or guideline pur- poses only. 1.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-9 Flow Meter Insertion The sensor hea d m ust be pr operly positioned in the pipe. For t his rea- son, it is i m portant that insertion length cal culations are careful ly fol- lowed. A sensor probe inser ted at the wrong depth in the pipe will r esult in inaccurat e readings.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 10 IM-24-HP Installing Flow Meters with a Compression Connection* Use the following formula to determine inser tion length for flow meters (NPT and flanged) with a compression proc ess connection.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-11 Insertion Procedure for Meters with a Compression Connection Figure 2-7. Flow Meter with Compression Type Fitting 1. Calculate the required sensor probe inser tion length. 2. Fully retract t he stem unt il the sensor head is t ouching the bottom of the stem housing.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 12 IM-24-HP Installing Flow Meters with a Packing Gland Co nnection* Use the formula below to determine the ins ertion depth for flow meters (NPT and flanged) equipped wit h an insertion tool. T o install, see the next page for instruc tions for meters with a permanent insertion t ool.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-13 Insertion Procedure for Flow Meters with Permanent Inse rtion Too l Figure 2-9. Flow Meter with Permanent Insertion Tool 1. Calculate the required sensor probe inser tion length (see previous page).
Chapter 2 Installation Series 24-HP Instruction Manual 2- 14 IM-24-HP Insertion Procedure for Flow Meters with Removable Ins ertion Tool Figure 2-10. Flow Meter with Removable Insertion Tool 1.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-15 7. Tighten the packing gland nuts to stop lea k age around the s tem . Do not torque over 20 ft-lbs. 8. Slide the ste m clamp back into position. T orque stem clam p bolts to 15 ft-lbs.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 16 IM-24-HP Insertion Procedure for Flow Meters with No Insertion Tool (Packing Gla nd Co nnection) 1. Calculate the required sensor probe inser tion length. 2. Fully retract t he stem unt il the sensor head is t ouching the bottom of the stem housing.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-17 Adjusting Meter Orientation Depending on installati on requirements, you m ay need to adj ust the meter orientati on. There are two adjus tm ent s av ailable. T he first rotates t he po- sition of t he LC D display/keypad and is available on both in-line and in- sertion meters.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 18 IM-24-HP Enclosure Adjustment (Series 240 Only) Figure 2-13. Enclosure Viewing Adjustment To avoid damage to the sensor wires, do not rot ate the enclosure beyond 180-deg r ees from the original position.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-19 Wiring Connections The NEMA 4X enclosure contains an integral wiring compartment with one dual stri p term i nal block (located in the smaller end of t he enclo- sure). Two 3/4-inch female NPT conduit ent ries are available for sepa - rate power and signal wiri ng .
Chapter 2 Installation Series 24-HP Instruction Manual 2- 20 IM-24-HP 4-20 mA Output Connection s The standar d I nnova-Mass Flow Meter has a single 4-20 mA loop. Two additional l oops are available on the optional com munication board. T he 4-20 m A loop curr ent is controlled by the meter electr onics.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-21 Figure 2-18. Non-Isolated 4–20 mA Output Using Meter Input Power Supply Figure 2-19. Isolated 4–20 mA Output usi ng Meter Provided Power S upply Pulse Output Connections The pulse out put is used for a remote counter.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 22 IM-24-HP Figure 2-20. Isolated Pulse Output with External Power Supply Figure 2-21. Non-Isolated Pulse Output Using Input Power Supply Figure 2-22.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-23 Alarm Output Conn e ctions One alarm output (Alarm 1) is included on the standard I nnova- Mass™ Flow Meter. Two or more alarms (Alarm 2 and Alarm 3) are included on the optional c om munication board.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 24 IM-24-HP Figure 2-25. Isolated Alarm Output Using Meter Provi ded Pow er Supply Remote Electronics Wiring The remote electr onics enclosure should be mounted in a convenient, easy to reach locati on.
Series 24-HP Instruction Manual Chapter 2 Installation IM-24-HP 2-25 Optional Input Electronics Wiring The meter has two optional input wiring terminals.
Chapter 2 Installation Series 24-HP Instruction Manual 2- 26 IM-24-HP.
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 1 Chapter 3 Opera ting Instruction s After insta lling the I nnova-Mass Vortex Flow Met er, y ou are ready to begin operation. The sections in this chapter explain the display/keypad com mands, meter start-up and programm i ng .
Chapter 3 Operation Series 24-HP Instruction Manual 3-2 IM-24-HP Setup Menus Password Mass Flow Rate Volume Flow Rate Temperatu re Pressure Density Total Alarm 1 Status Fluid ENTER Date & Time Ala.
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 3 Using the Setup Men us Programming the Flo w Meter 1. Enter the Setup Me nu by pre ssing the EN TER key unt il prompted for a password. (All outputs are di sabled while using the Setup Menus.
Chapter 3 Operation Series 24-HP Instruction Manual 3-4 IM-24-HP Output Menu Password ENTER Use keys to access menus Output Menu 4-20mA Output 1 More > ENTER Run Mode 4- 20mA Output 2 More > <.
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 5 Example for S etting an Output The following sh ows how to s et Output 1 to measure mass f low w ith 4 mA = 0 lb/hr and 2 0 m A = 1 00 lb/hr wi th a time constant of 5 seconds. (All outputs are disabled w hile using the Setup Menus.
Chapter 3 Operation Series 24-HP Instruction Manual 3-6 IM-24-HP Display Menu Password ENTER Use keys to access menus Display Menu Cycle Time(Sec) 0 ENTER Run Mode Number of Digits 2 MF Vf Te Pr De T .
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 7 Alarms Menu Example for S etting an Alarm The following sh ows how to s et Alarm 1 to activate if the mas s flow rate is greater than 100 lb/hr. Yo u can check the alarm configu ration in the Run Mode by pressing the key s until Alarm [1] appears.
Chapter 3 Operation Series 24-HP Instruction Manual 3-8 IM-24-HP Totalizer #1 Menu Use the Total iz er Menu to confi g ur e and m onit or the totalizer. The t otalizer output is a 50 millisecond (.05 second) pos itive pulse (relay closed for 50 milliseconds ).
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 9 Totalizer #2 Menu Use the Total iz er #2 to Monit or Flow or Energy . Note t hat Totalizer #2 does not operat e a relay, it is for monitoring only.
Chapter 3 Operation Series 24-HP Instruction Manual 3-10 IM-24-HP Energy Menu – For EMS E ner gy Meters Only Password ENTER Use keys to acces s menus Energy Menu Loc in Sent Flow Yes or No ENTER Run.
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 11 Fluid Me nu Password ENTER Use ke y s to a cc ess men us Fluid Menu Flowing Fluid Liquids > Goyal-Dorais > API 2540 > Nat Ga.
Chapter 3 Operation Series 24-HP Instruction Manual 3-12 IM-24-HP Units Menu Use the Units Menu to c onfig ure the flow meter with the desired units of measurement.
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 13 Time & Date Menu Passw ord ENTER Use keys to a c cess menus Time & Date Menu Set Time xx:x x:xx ENTER Run Mod e Set Date xx/x x/xx Use the Time and Date Menu to ent er the correct time and date into t he flow m et er’s mem ory.
Chapter 3 Operation Series 24-HP Instruction Manual 3-14 IM-24-HP Diagnostics Menu Password ENTER Use keys to access menus Diagnositcs Menu Sim Vor Freq xxx ENTER Run Mode Sim Temp 1,2 xxx Sim Pressur.
Series 24-HP Instruction Manual Chapter 3 Operation IM-24-HP 3- 15 Calibration Menu The Calibra tion Menu contains the cali bration coefficient s for the flow meter. These values should by changed only by pr operly trained personnel. The Vortex Coef Ck and Low F low Cutoff are set at the factory.
Chapter 3 Operation Series 24-HP Instruction Manual 3-16 IM-24-HP Password Menu Pass word ENTER Use keys to access me nus Pass word Menu Set Passw ord 1234 ENTER Run Mode Use the Password Menu to set or change the system pas sword. The factory-set password is 1234.
Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair IM-24-HP 4-1 Chapter 4 T roubles hooting and Repair Hidden Diagn ostics Menus The menus shown to the left ca n be accessed using the password 16363, t hen mov i ng t o the display that reads “Diagnostics Menu” and pres sing ENTER (rather t han one of the arrow keys).
Chapter 4 Troubleshooting & Repair Series 24-HP Instruction Manual 4-2 IM-24-HP Column One Hidden Diagnostics Values • f = vortex shedding fre quency (Hz). • fi = adaptive filter – should be approximately 25% higher than the vortex shedding freque ncy , this is a low-pass filter.
Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair IM-24-HP 4-3 • Lvl = threshold level. I f the Low Flow Cutoff in the c alibra- tion menu is set above this value, the meter will rea d zero flow. The L vl leve l can be chec ked at no flow.
Chapter 4 Troubleshooting & Repair Series 24-HP Instruction Manual 4-4 IM-24-HP • Alarm (2) Test = Used as a te st to verify that the alarm circuit is functioning. When low is selected the ala rm will initiate a low alarm on the output. When High is selecte d it will give a high alarm on the output.
Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair IM-24-HP 4-5 • Pressure Cal Current = Calibration value for the electronics and pressure tra nsducer combination. Consult Factory for value. • RTD1. Press the RI GHT ARROW to access: o Ro = RTD resistance a t 0°C (1000 ohms).
Chapter 4 Troubleshooting & Repair Series 24-HP Instruction Manual 4-6 IM-24-HP Troubleshooting the Flow Meter Symptom : Output at no Flow 1. The low flow cutoff is set too low. At no flow, g o t o the first column of the hidden diagnostics menu a nd record the L vl value.
Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair IM-24-HP 4-7 4. The vortex coefficient Ck may be incorrectly set. The Ck is a value in the equation used to determine if a f requency represents a valid vortex signal given the f luid density and signal amplitude.
Chapter 4 Troubleshooting & Repair Series 24-HP Instruction Manual 4-8 IM-24-HP Symptom : Meter D isplays Temperature F au lt 1. For remote mounted ele ctronics, caref ully check all the wiring connections in the remote mount junction box.
Series 24-HP Instruction Manual Chapter 4 Troubleshooting & Repair IM-24-HP 4-9 nector on the tempera ture / pressure boar d. The current should be approximately .0004 amps. 3. Go to the first column of the hidden diag nostics and record the Pe(V) and Pv(V) value s and consult the factory with findings.
Chapter 4 Troubleshooting & Repair Series 24-HP Instruction Manual 4-10 IM-24-HP Pressure Sensor Replaceme nt 1. For local mounted elec tronics, remove the elec tronics stack as previously described. For remote mount electr onics, remove all wires and sensor conne ctors from the remote fe edthrough board in the junction box at the meter.
Series 24-HP Instruction Manual Appendix A Specifications IM-24-HP A-1 Appendix A Product Specific ations Accuracy Process Variables 240 Series In-Line Meters 241 Series Insertion Meters (1) Liquids Gas & Steam Liquids Gas & Steam Mass Flow Rate ± 1% of rate over a 30:1 range (3) ± 1.
Appendix A Specifications Series 24-HP Instruction Manual A-2 IM-24-HP Nominal Pipe Siz e (in) Pressure 0.5 0.75 1 1.5 2 3 4 6 8 1.8 3 5 13 22 50 87 198 347 18 41 90 221 369 826 1437 3258 5708 5 9 15 .
Series 24-HP Instruction Manual Appendix A Specifications IM-24-HP A-3 Nominal Pipe Siz e (in) Pressure 0.5 0.75 1 1.5 2 3 4 6 8 6.5 12 20 49 82 183 318 722 1264 52 122 265 650 1087 2431 4231 9594 168.
Appendix A Specifications Series 24-HP Instruction Manual A-4 IM-24-HP 241 Pressure Ratings Probe Seal Process Connection Material Rating Ordering Code Compression Fitting 2-inch MNPT 316L SS ANSI 600.
Series 24-HP Instruction Manual Appendix A Specifications IM-24-HP A-5 Pocess Fluid and Process Fluid: Ambient Tem per ature Standard temperature sensor: –40° F to 500° F (–40° C to 26 0° C). High temperature sensor: to 750° F ( t o 40 0° C).
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Series 24-HP Instruction Manual Appendix B Glossary IM-24-HP B-1 Appendix B Glos sary A B C D A Cross sectional area. ACFM Ac tua l Cubic Feet Per Minute (volumetric f l ow rate). ASME Am erican Society of Mechanical Engineers. Bluff Body A non-stream l ined body placed into a flow stream to create vortices.
Appendix B Glossary Series 24-HP Instruction Manual B-2 IM-24-HP I J K L In-Line Flow Meter A flow meter which includes a short section of piping which is put i n-line wi th the user’s piping. Insertion Flow Mete r A flow meter which is inserted into a hol e in the user’s pipeline.
Series 24-HP Instruction Manual Appendix B Glossary IM-24-HP B-3 Q R S T Q Flow rate, usuall y volum etric. Rangeabili ty Highest m easurable flow rate divi ded by the lowest measur abl e flow rate.
Appendix B Glossary Series 24-HP Instruction Manual B-4 IM-24-HP.
Series 24-HP Instruction Manual Appendix C Fluid Calculations IM-24-HP C-1 Appendix C Fl uid Calcula tions Calculations for Steam T & P When “Steam T & P” is selected i n the “Real Gas” selection of t he Fluid Menu, the calcul ations are based on the equati ons below.
Appendix C Fluid Calculations Series 24-HP Instruction Manual C-2 IM-24-HP Calculations for Gas (“Rea l Gas” and “Othe r Gas”) Use this formula to deter m ine t he settings for “Real Gas; Gas” select ions and “Other Gas” select ions entered in the Fluid M enu.
Series 24-HP Instruction Manual Appendix C Fluid Calculations IM-24-HP C-3 Calculations for Liquid Use this formula to deter m ine t he settings for “Goyal- Dorais” select ions and “Other Liquid” sel ections entered in the Fl uid Menu. The liquid cal- culations were t ak en from Richard W.
Appendix C Fluid Calculations Series 24-HP Instruction Manual C-4 IM-24-HP.
Series24-HP Instruction Manual Appendix D HART Commands IM-24X D-1 Appendix D HART Comma nds with DD Menu On line Men u 1 Dev ice Se tup 2 P rocess V ariables 3 P V is 4 P V 5 A O1 Out 6 P V % rnge 7 .
Appendix D HART Commands S eries24-HP Instruction Manual D-2 IM-24-HP Appendix D HART Comma nds without DD Men u Online Menu 1 Device Setup 2 PV 3 PV AO 4 PV LRV 5 URV 1 Process Variables 2 Diag/Servi.
Appendix E MODBUS Commands Series 24-HP Instruction Manual IM-24-HP E-1 Appendix E M odbus Commun ication A pplicable Flow Meter Models Sierra Innova-Mass® Mass Flow Meters, Model s 240 and 241 wi th Modbus comm unication p ro- tocol and firmware version 3.
Appendix E MODBUS Commands Series 24-HP Instruction Manual E-2 IM-24-HP Mo dbus Units The Mod bus Units menu is t o control what units, where app l icable, the me ter’s v ariables will be displayed in.
Series 24-HP Instruction Manual Appendix E MO D BUS Commands IM-24-HP E-3 there is an informal register num bering conve ntion derived from the origi nal (now obsolete) Modicon Modbus protocol specification, and used by m any vendors of Modbus capable products.
Appendix E MODBUS Commands Series 24-HP Instruction Manual E-4 IM-24-HP gramming Outpu t Menu’s “Modbus Units” item . The display units strings may be examine d by accessing their associated registers.
Series 24-HP Instruction Manual Appendix E MO D BUS Commands IM-24-HP E-5 The f ollowing registers contain t he display units strings: Registers Variable Data ty pe Units Function code Addresses 32007.
Appendix E MODBUS Commands Series 24-HP Instruction Manual E-6 IM-24-HP Discrete Input Definitions The status of th e three alarms m ay be m onito red via the Modb us Read Discrete Input comm and (function code 02). The value returned indi cates the state of the alarm, and will be 1 o nly if the alarm is enabl ed and active.
Series 24-HP Instruction Manual Appendix E MO D BUS Commands IM-24-HP E-7 Command M essage Format The start address i s equal to the desired first register number m inus one. The addresses derived from the start address and the number of registers m ust all be mapped to valid defined registers, or an inva lid data address exception wi ll occur .
Appendix E MODBUS Commands Series 24-HP Instruction Manual E-8 IM-24-HP A ty pical response f rom the device is as follows: *no te these are the older register definitions 01 04 18 00 00 03 E8 0 0 00 .
Series 24-HP Instruction Manual Appendix E MO D BUS Commands IM-24-HP E-9 01 Device a ddress 05 Function code 5 = w rite single coil 00 09 Coil address = 9 FF 00 Data to reset to talizer 8C 3A CRC ( not the cor rect CRC EJ S-02-06-07 ) The unit responds with an ide ntical message to that transm itted, a nd the totaliz er is reset.
Appendix E MODBUS Commands Series 24-HP Instruction Manual E-10 IM-24-HP.
An important point after buying a device Sierra 240-VT (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Sierra 240-VT yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Sierra 240-VT - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Sierra 240-VT you will learn all the available features of the product, as well as information on its operation. The information that you get Sierra 240-VT will certainly help you make a decision on the purchase.
If you already are a holder of Sierra 240-VT, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Sierra 240-VT.
However, one of the most important roles played by the user manual is to help in solving problems with Sierra 240-VT. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Sierra 240-VT along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
