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CPT6140 Operating Instructions

High-Speed Pressure Sensor

CPT6140

3. Product Description

3.1 General Description
The CPT6140 High-Speed Pressure Transducer is a self-contained pressure sensing device that 

provides high accuracy pressure measurements. The CPT6140 gives a streaming output at 250Hz 

from a low hysteresis silicon sensor with electronically compensated pressure linearity over the 

specified temperature range. Communication with the CPT6140 is over a RS-232 or RS-485 serial 

bus.
3.2 Power Supply
The required 12VDC power enters via J1. The power supply used to power the device must be a 

limited-energy device supplying less than 8.3A at 12VDC. It is recommended that the power supply 

is IEC 61010-1 3rd ed. compliant.
3.3 Sensor
The pressure sensor is a micromachined silicon strain gauge. The sensor is secured to the trans-

ducer case.
3.4 Circuitry
All of the circuitry is included on a single PC board. The combined pressure and temperature sen-

sor signals are routed to the signal conditioning electronics.
3.5 Serial In/Out Communications

Figure 3.6 - Serial In/Out Communications

Summary of Contents for CPT6140

Page 1: ...Operating Instructions High Speed Pressure Transducer High Speed Pressure Transducer CPT6140 PN 0019310001F 10 2018 CPT6140 ...

Page 2: ...considerable damage mortal danger danger of injury will occur if the respective safety precautions are not taken This Caution symbol indicates danger for the system and material if the respective safety precautions are not taken This Notice symbol does not indicate safety notices but information for a better understanding of the facts Caution i Notice Warning ...

Page 3: ...fications and Accreditations 6 2 Safety Notices 7 2 1 Warnings and Caution Notices 7 3 Product Description 8 3 1 General Description 8 3 2 Power Supply 8 3 3 Sensor 8 3 4 Circuitry 8 3 5 Serial In Out Communications 8 4 Specifications 10 5 Installation 12 5 1 Unpacking 12 5 2 Dimensions 12 5 3 Configuration 12 5 4 Mounting 12 5 5 Pressure Connections 13 5 6 Electrical Connections 13 5 6 1 Connecto...

Page 4: ... 1 Wildcard Address Operator 17 6 4 2 Password Protection 17 6 4 3 Response String Format 17 6 4 4 Commands and Queries 18 6 4 5 Pressure Unit Code and Conversion 20 7 Calibration 22 7 1 Environment 22 7 2 Equipment 22 7 3 Pressure Standard 24 7 4 Calibration Medium 24 7 5 Calibration Process 24 7 6 Correction Value Query 24 7 7 Zero Adjustment 25 7 7 1 Gauge Zero Offset 25 7 7 2 Absolute Zero Off...

Page 5: ...ner of repair Service repairs or disassembly of the product in any manner performed without specific factory permission voids this warranty MENSOR MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS MANUAL INCLUD ING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FIT NESS FOR A PARTICULAR PURPOSE Mensor shall not be liable for errors contained herein or for incidental or consequent...

Page 6: ...OFITS BUSINESS INTERRUPTION LOSS OF BUSINESS INFORMA TION AND THE LIKE ARISING FROM OR IN CONNECTION WITH THE DELIVERY USE OR PERFORMANCE OF THE SOFTWARE PROGRAM 1 4 Mensor Service Plus If you have problems and you don t find the answer in this manual contact Mensor at 1 800 984 4200 USA only or 1 512 396 4200 for personal assistance or at any of the contact ad dresses listed on the rear cover of ...

Page 7: ...ion of this manual This instrument is not designed for oxygen use Caution ESD PROTECTION REQUIRED The proper use of grounded work surfaces and personal wrist straps are required when coming into contact with exposed circuits printed circuit boards to prevent static discharge to sensitive electronic components Avoid excessive overpressure to the transducer Externally mounted relief valves to provid...

Page 8: ...e CPT6140 is over a RS 232 or RS 485 serial bus 3 2 Power Supply The required 12VDC power enters via J1 The power supply used to power the device must be a limited energy device supplying less than 8 3A at 12VDC It is recommended that the power supply is IEC 61010 1 3rd ed compliant 3 3 Sensor The pressure sensor is a micromachined silicon strain gauge The sensor is secured to the trans ducer case...

Page 9: ...easured pressure values and other transducer infor mation to the user This port is also used to transmit calibration adjustments and other user func tions to the transducer Pressure units for each transducer are specified by the customer Wiring requirements for the serial port are provided in the Installation section and a list of valid commands and responses Table 6 5 4 is provided in the operati...

Page 10: ...si abs Precision 6 0 009 FS 0 009 FS Calibration interval 180 days 365 days CPT6140 as barometric reference Measuring range 552 1 172 mbar abs 8 17 psi abs Accuracy 1 0 025 of reading Calibration interval 365 days Pressure units psi bar mbar Pa kPa hPa MPa tsi atm torr Dynes cm g cm kg cm mSW oz in psf tsf mmH2 O 4 C cmH2 O 4 C mH2 O 4 C inH2 O 4 C inH2 O 20 C inH2 O 60 F ftH2 O 4 C ftH2 O 20 C ft...

Page 11: ...t The reference port is sealed for absolute pressure transducers Overpressure limit 10 above the nominal pressure of the transducer Material wetted parts Aluminium brass 316SS Buna N Viton silicone grease silicone rubber nylon ceramic glass silicon Voltage supply Power supply 12 VDC 10 55mA max Permissible ambient conditions indoor use only Compensated temperature range 15 45 C 59 113 F Operating ...

Page 12: ...uration A typical system will consist of an IBM PC compatible computer with installed driver software one or more CPT6140 s a DC voltage power supply and the interconnecting cables The driver soft ware can be any program configured to operate the appropriate serial interface Only 1 CPT6140 can be connected using RS 485 Refer to Figure 5 6 3 for an illustration of a RS 485 wiring arrangement 5 4 Mo...

Page 13: ...e If the transducer is used in a differential mode static line pressures may affect the calibration 5 6 Electrical Connections Figure 5 6 RS 232 Hookup 1 Connectors are female shown from the wired end 2 See Table 5 6 for a complete listing of the DB 9 connections Table 5 6 DB 9 Connections Pin RS 232 RS 485 1 N C TA 2 TX RB 3 RX RA 4 ANA ANA 5 PWR GND PWR GND 6 12 VDC 12VDC 7 ANA ANA 8 5Vin 5Vin 9...

Page 14: ...t computer to the CPT6140 per the wire diagram shown in Figure 5 6 3 Notice that the host TRANSMIT lines are connected to the CPT6140 RE CEIVE lines TA to RA TB to RB and so on Only one RS 485 CPT6140 should be connected to the system disregard the wiring to CPT 31 and CPT6140 2 in the illustrations Instead wire the computer directly to the CPT 1 by the four wire method Do not connect more than on...

Page 15: ...r static pressure noise The filter value can range from 0 filter OFF to 99 maxi mum filtering For any positive filter value the filter is disabled when the pressure change between consecutive readings is greater than 0 01 full scale However each pressure change of 0 01 FS or less between consecutive readings will apply the exponential filter to the output pressure value to smooth out the readings ...

Page 16: ...e same To change an address see Table 6 5 4 for command set information 6 3 Communication Output Modes The output mode is set at the factory to mode 6 on all CPT6140 s Mode 6 Burst mode This is a continuously streaming mode where the pressure value is sent four bytes in IEEE754 big endian and a one byte checksum Example 41 E8 A1 CD 97 The first four bytes received are the characters 41 E8 A1 CD wh...

Page 17: ...nsducer is con nected to a host The wildcard can be used to address multiple devices with commands One use for the wildcard address could be when a CPT6140 is pulled out of a multi drop setup and sent to a calibration facility for recertification The calibration technician can communicate with the device using the wildcard address without learning or changing its assigned address 6 4 2 Password Pr...

Page 18: ...oint n n Variable length field R Ready response cr Carriage return lf Linefeed 6 4 4 Commands and Queries i Notice Each command that changes a parameter is volatile until the SAVE com mand is issued Table 6 4 4 Command Set Pass word Protect Command or Query Command String Return String Description No X cr X sp nnnnnnnnnn cr lf Basic query to return pressure readings No A XA sp n cr R Sets address ...

Page 19: ...on for the following single com mand See 6 4 2 Password Protection for information on using the password No R XR cr X sp R sp n n cr lf Returns minimum range value No R XR cr X sp R sp n n cr lf Returns maximum range value No SAVE XSAVE cr R Saves all data to EEPROM for the current turndown No SC XSC cr X sp SC sp n n cr lf Returns a span correction multiplier Yes SC XSC sp n n cr R Loads a span c...

Page 20: ... 60 F 27 70759 7 ftH2O 4 C 2 306726 8 ftH2O 20 C 2 310814 9 ftH2O 60 F 2 308966 10 mtorr 0 C 51715 08 11 inSW 0 C 3 5 salinity 26 92334 12 ftSW 0 C 3 5 salinity 2 243611 13 atm 0 06804596 14 Bars 0 06894757 15 mBars 68 94757 16 mmH2O 4 C 703 0890 17 cmH2O 4 C 70 30890 18 mH2O 4 C 0 7030890 19 mmHg 0 C 51 71508 20 cmHg 0 C 5 171508 21 Torr 51 71508 22 Kpa 6 894757 23 Pa 6894 757 24 Dynes cm2 68947 ...

Page 21: ...CPT6140 Operating Instructions 21 High Speed Pressure Sensor CPT6140 29 psf 144 30 tsf 0 072 31 Full Scale 32 microns Hg 0 C 51715 08 33 tsi 0 0005 35 HPa 68 94757 36 MPa 0 006894757 ...

Page 22: ...ied calibration range In addition for maximum accuracy see that the CPT6140 is at rest on a stable platform which is free of vibration and shock and oriented similar to its final installation attitude At the factory the CPT6140 is calibrated vertically with the pressure port at the top 7 2 Equipment The following equipment is needed to calibrate a gauge transducer see Figure 8 2 1 A downloadable v...

Page 23: ...CPT6140 Operating Instructions 23 High Speed Pressure Sensor CPT6140 A Figure 8 2 Calibration Setup ...

Page 24: ...cer 7 5 Calibration Process Please notice that the commands listed in this section are shown in the same style as those in the Operation section These are the bare commands seen by the CPT6140 stripped of all program ming idioms Depending on the specific language used to generate them these commands may have to be preceded by or enclosed in various symbols for transmission For this procedure it is...

Page 25: ... the date and this reading to track zero changes between calibrations 2 Vent the PRESSURE and REFERENCE ports to atmosphere The true pressure is now 0 zero Send PW cr Next send ZC sp 0 cr This will clear the current zero offset from RAM 3 While vented determine the current zero pressure reading of the CPT6140 Send cr Make a note of the zero value returned by the CPT6140 4 Subtract the current zero...

Page 26: ...PW cr Next send ZC 0 cr 4 Determine the current pressure reading Send cr and make a note of this reading 5 Subtract the current pressure reading from the true pressure vacuum reading The difference is the zero offset now required Example For a 0 15 psia unit with 600 mTorr absolute pressure applied using psi units 600 millitorr 0 0116 psia True Pressure Current Pressure reading from step 4 0 0011 ...

Page 27: ...e span of the CPT6140 To determine the CPT6140 pressure reading Send cr and make a note of this reading 4 Divide the known true pressure by the CPT6140 pressure reading The result is the required new span scale factor Example For a 150 psi unit True pressure 150 003 psi CPT6140 pressure reading from step 3 149 984 psi True pressure CPT6140 pressure New Span Scale Factor 150 003 149 984 1 000127 5 ...

Page 28: ...Fax 512 396 1820 sales mensor com www mensor com CPT6140 Operating Instructions PN 0019312001F 10 2018 WIKA Alexander Wiegand SE Co KG Alexander Wiegand Straße 30 D 63911 Klingenberg Germany Tel 49 93 72 132 5015 Fax 49 93 72 132 8767 CTSales wika de www wika de ...

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