TESTO 6740 Instruction Manual Download

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10. Accessories/Spare parts

Name

Part no.

Basic instruments (incl. plug for analog signal output)

with process connection G1/2, without display

0555 6741

with process connection NPT1/2”, without display

0555 6742

with process connection G1/2, with display

0555 6743

with process connection NPT1/2”, with display

0555 6744

Accessories

Cable connection plug for power/analog output 4 to 20mA, with 2 floating switch contacts and

0554 3302

2 LEDs (limit signal output, alarm output)
Measurement chamber for optimum flow on humidity sensor, max. 15bar, for thread G½

0554 3303

Cooling coil for process temperatures above 50 °C (up to 200°C)

0554 3304

Scaling adapter for testo 6740

0554 3305

ISO calibration certificate for pressure dew point (-40° to 0°Ctp at 6bar), free choice of points

0520 0116

ISO calibration certificate for pressure dew point at -10°Ctp and -40°Ctp

0520 0136

External display testo 54-2AC, 2 relay outputs (to 300VAC, 3A), 230VAC

5400 7553

PTFE hose with compressed air connections, 2m, max. 9bar

0699 2824/4

Power unit (desk-top unit), 90 to 264VAC/24VDC (3A)

0554 1748

Power unit (DIN rail mounting), 90 to 264VAC/24VDC (3A)

0554 1749

10. Accessories/Spare parts

Summary of Contents for 6740

Page 1: ...Instruction manual en testo 6740 ...

Page 2: ...hat you will enjoy many years of using the product and that it will help you in your work If problems should occur which you cannot rectify yourself please consult our service department or your dealer We will endeavour to provide fast and competent assistance to save you long periods out of operation ...

Page 3: ...anual by pictograms Warnings are identified by means of a warning triangle The relevant signal word indicates the degree of risk Warning means Serious physical injury could occur if you do not take the precautionary measures indicated Caution means Slight physical injury or material damage could occur if you do not take the precautionary measures indicated Pay particular attention to warnings and ...

Page 4: ...t intervals 8 4 Initial operation 9 4 1 Mechanical assembly 9 4 2 Electric connection 11 4 3 Analog output Limit signal outputs 14 5 Menu guide 0555 6743 0555 6744 only 16 6 Adjustment on site 19 7 Care and maintenance 23 8 Troubleshooting 24 9 Technical data 25 9 1 Measurement ranges and accuracies 25 9 2 Additional instrument data 25 9 3 Uncertainty pressure dewpoint temperature 26 10 Accessorie...

Page 5: ...y to the measurement range of the sensors Do not subject handles and lines to temperatures greater than 70 C if they are not expressly approved for higher temperatures Open the instrument for maintenance and repair purposes only if specifically described in the Instruction Manual Maintenance work should only be carried out if described in the Instruction Manual Please adhere to the steps described...

Page 6: ...trace humidity It is used in the following areas Monitoring trace humidity in compressed air systems and gas networks e g pipeline and container drying Controlling and monitoring compressed air driers Monitoring compressed air humidity in vehicles Monitoring humidity and temperature in medical compressed air or granulate driers Application in hazardons areas is not allowed ...

Page 7: ...uired if incoming flow is to be increased measurement chamber guarantees a minimum incoming flow of 1l min at a positive pressure of 6bar fast assembly dismantling of transmitter without interrupting process is required To PLC control analysis unit 3 2 Operating elements The instruments with the article numbers 0555 6741 and 0555 6742 do not have any additional operating elements The instruments w...

Page 8: ...Hr C F ppmv mg m3 Abs 4mA 60 75 60 75 0 0 32 0 0 20mA 30 85 30 85 100 50 120 30000 2 30000 2 LS 4 40 4 40 30 10 50 8400 7000 US 10 55 10 55 50 30 85 13000 9600 Hyst 2 2 2 2 2 2 2 2 2 1 With dew point temperatures 0 Ctp 0 CtA 32 Ftp 32 FtA the frostpoint temperature dewpoint upon ice is displayed 2 Display is shown to the power of ten 30E3 corresponds to 30 x 103 30 x 1000 30000 3 4 Current output ...

Page 9: ...o the matching thread The housing can be rotated by 350 Do not use force when aligning 2 Set up housing so that the display can be easily read Tighten grub screw 3 Complete aeration of pipe section and apply pressure to pipe section 4 Initial operation Assembly Application Without measurement chamber Process temperatures 0 to 50 C and cooling coil It is possible to attach sensor directly in proces...

Page 10: ...rement chamber in standard socket of compressed air line With measurement chamber and cooling coil max 15bar 1 Connect measurement chamber without measure ment transmitter to the compressed air push in quick connection for approx 10 30 s in order to blow out any dirt deposits 2 Remove measurement chamber from compressed air push in quick connection 3 Screw in process connection G of testo 6741 674...

Page 11: ... the plug housing To do this apply a small screwdriver to the point marked with lift and press out carefully 3 Screw on the cable positioning device and guide the cables through the plug housing 4 Connect cable ends to the screw terminals of the plug socket Plug socket terminals 1 4 to 20mA power 12 30VDC 2 4 to 20mA 3 Not assigned 4 Measuring earth cable screen 5 Insert plug socket into plug hous...

Page 12: ...alvanically connected so connect either or 0554 3302 plug with 2 switch outputs We recommend an 8 wire cable with a tightly braided screen wire cross section 0 2 to 0 8mm2 1 Loosen and remove screw at the back of the plug and remove plug from transmitter 2 Tilt the cover of the plug housing at an angle and remove 3 Remove plug socket from the front and the relay board from the back out of the plug...

Page 13: ...ation 4 2 Electric connection 13 6 Push plug socket and plug board into the plug housing pay attention to alignment and close lid 7 Screw on cable positioning device 8 Attach plug to transmitter and screw into place ...

Page 14: ...ave a 4 to 20mA analog output available in two wire technology RL x y P Po ow we er r Standard plug U 12 to 30VDC 0554 3302 plug U 20 to 28VDC x x y y c co on nn ne ec ct tiio on n Connection x Terminal 1 y Terminal 2 M Ma ax x llo oa ad d R RL e ex xt te er rn na all llo oa ad d U Standard 0554 3302 12V 50 Ohm 24V 650 Ohm 650 Ohm 30V 950 Ohm 4 to 20mA ...

Page 15: ...Definition Upper Switch US default setting 10 Ctpd H HY YS St t default setting 2K H HY YS St t Terminal 2 Terminal 3 US Terminal 4 Terminal 5 M Ma ax x c ciir rc cu uiit t 30VDC 0 5A Switching point LS HYST default setting 6 Ctpd Switching point US HYST default setting 12 Ctpd Default settings for other parameters ppm RH See 3 3 Settings p 8 Example The lower alarm shall be switched at 8 Ctpd The...

Page 16: ...off Select using De Activate dS 2 Change value unit ON 6s value 2s unit OFF Value continuously Select using Set absolute pressure in bar PrES 5 1 Next digit Test analog output AtES No signal 4 4mA 12 12mA 20 20mA Select using Activate using ProG Display Min value Lo Display Max value Hi Set code UCod 7 1 Next digit Display mode 1 2 11 13 Reading and unit alternately Reading continuously see Unit R...

Page 17: ... to setting in default setting 5s 4 Only with deactivated code can be set in P Pr ro og g U UC Co od d menu 5 Absolute pressure can be set in P Pr ro og g P Pr re es s menu is included in the calculation of the ppm value and atmospheric dew point CtA FtA 6 For negative values select at left digit position 7 To deactivate codes Enter 0000 Important Note down the code at a suitable point operation i...

Page 18: ...he relative humidity at the pressure level P1 are alternately displayed Please wait until the relative humidity has a constant value and only then press the SET button 16 In this setting point P2 and the relative humidity at the pressure level P2 are alternately displayed Switch the switchover cock of the adjustment device and then wait until the relative humidity has a constant value and only the...

Page 19: ...rence value is entered is only available if one of the following units is set Ctp Ftp rF Hr or rh See 5 Menu guide p 16 Unit menu Setting unit Reference value input Optimum precision is achieved at reference value 40 C tpd In case low dewpoints 25 C tpd are relevant it is suggested to avoid reference values 30 C tpd else loss of precision 1 Expose reference measuring instrument and testo 6740 to i...

Page 20: ...3 to trace humidity A reference instrument or humidity generator is not necessary Depending on the position of the switchover cock of the 2 pressure adjustment device the sensor of the testo 6743 is exposed to two different pressure levels In front of the switchover cock of the 2 pressure adjustment device is a sintered filter which prevents dirt particles rust and oil from entering the adjustment...

Page 21: ...polation calculation is possible between the two values 2 Open menu 2PA see chapter 5 Menu guide P1 and the relative humidity rF at the pressure level P1 are alternately displayed The measuring instrument testo 6743 requires stable pressure values for the two pressure adjustment 3 Wait until the value is constant and then press the SET button see chapter 5 Menu guide P2 and the relative humidity r...

Page 22: ...9 Unscrew testo 6743 from the adjustment chamber and re install for continuous operation Limits of the adjustment chamber In order to avoid false adjustments the adjustment described above is only accepted by testo 6743 if a The temperature during the adjustment process remains constant i e the temperature difference is less than 0 5 Kelvin I T1 T2 I 0 5 K or b The calculated offset correction is ...

Page 23: ...sensor with isopropyl alcohol and or distilled water Allow the sensor to dry completely Cleaning the adjustment chamber The sintered filter integrated into the adjustment device should be blasted clean with compressed air at regular intervals depending on the degree of contamination Unscrew the sintered filter from the adjustment device and blast clean against the flow through direction After blas...

Page 24: ...ocal distributor or Testo s Customer Service Signal 4mA Sensor corroded Sensor must be replaced Contact your local distributor or Testo s Customer Service Display oF No signal from sensor Contact your local distributor or Testo s Customer Service Displayed reading flashes Scaling limits exceeded Change scaling limits in Unit S Lo or S Hi Menu If the fault cannot be repaired by following the sugges...

Page 25: ...re 20 to 80 C Protection classIP65 with plug attached and cable connected Rotatability 350 display alignment Humidity sensor Testo humidity sensor with logged trace humidity adjustment at 40 Ctp 6bar Temperature sensor NTC Sensor protection Stainless steel sintered cap Pressure resistance 1barrel to 50barabs Measurement chamber 0554 3303 max 15barabs Dimensions 199 5x37x37 with standard plug 203 5...

Page 26: ...9 Technical data 9 3 Uncertainty pressure dewpoint temperature 26 9 3 Uncertainty pressure dewpoint temperature ...

Page 27: ...easurement chamber for optimum flow on humidity sensor max 15bar for thread G 0554 3303 Cooling coil for process temperatures above 50 C up to 200 C 0554 3304 Scaling adapter for testo 6740 0554 3305 ISO calibration certificate for pressure dew point 40 to 0 Ctp at 6bar free choice of points 0520 0116 ISO calibration certificate for pressure dew point at 10 Ctp and 40 Ctp 0520 0136 External displa...

Page 28: ...0970 6740 en 08 en GB ...

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