NOSHOK Series 755 / 756 Digital Pressure Transmitter Operating Manual
Contents 1 General Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.1 2.1.1 2.1.2 2.1.3 2.2 2.2.1 2.2.2 2.3 Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pressure Transducer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Operation of Devices with Displays. . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.1 6.2 6.3 6.4 6.5 6.5.1 6.5.2 6.5.3 6.5.4 6.5.5 6.5.6 The Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Key Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Programming Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Product Description The pressure transmitter can be used in level control as well as pressure measurement in process applications. A variety of process connections, measurement ranges, electronic interfaces and display options offer a product for a wide range of applications. 2.1 Construction The Digitrans consists of a pressure sensor, a control interface unit and a housing cover with optional display. Different modular configurations are available allowing a variety of designs. 2.1.
2.1.3 Display Unit $"+)#/"1)-, /",'% The measured-value indicator has four digits (in a 7-segment display) + symbols. Below it, is line 1 (16-segment display) used to display error codes and the signal’s unit of measure. The unit of measure can be selected by the operator. Additional information is displayed in lines 2 and 3 (16-segment display). The operator can enter commands in the programming mode on the display unit by means of menu driven, clear-text prompts.
2.2 Function The mode of operation for signal conversion is the same for all versions. The pressure transducer converts the existing pressure into an electrical signal. Microelectronics further process the input signal and produce a proportional 4-20 mA standard signal. The display-version allows programming (parameterization) and the display of expanded functions such as inversion, dampening, alarm status and linearization. 2.2.
2.3 Installation Examples The Digitrans is primarily used to detect the pressure in pipes, plants and tanks. The pressure is measured using absolute (against a vacuum) or relative (against external or air pressure) measurement depending on the type of sensor selected. The Digitrans is also used for hydrostatic pressure measurement of liquids in tanks. Process Pressure Measurement: Process Pressure Measurement: Used to measure pressure of liquids Used to measure container pressure.
EA8 007-DS-D 008-DS-D Level Control: Level Control: Externally mounted Combined pressure and head pressure (with front flush diaphragm) are measured by two externally mounted pressure transducers. The two signals are anylized and the differential is calculated by a PLC or suitable signal converter.
3 Technical Data 3.1 Input-values overload limit Pressure Range (Absolute pressure upon request) 3.2 0 - 5 psi 0 - 25 psi 0 - 100 psi 0 - 250 psi 0 - 500 psi 0 - 1500 psi 0 - 3000 psi 0 - 7500 psi 0 - 15000 psi 30 psi 150 psi 500 psi 1200 psi 1200 psi 3000 psi 7500 psi 18000 psi 22000 psi Output-values Output signal 4 ... 20 mA Characteristic deviation [% of span] (linearity, hysteresis, repeatability) < 0.10 at ranges of > 600 psi < 0.
3.3 Construction Process connections Series 755 Series 756 1/2” NPT Male Front Flush Materials Housings Series 755 Series 756 Electrical connection and protection method per EN 60 529/ IEC529 M 20 x 1.5 cable gland with internal terminal block (see 4.4) Electronic protection methods Reverse polarity, overload and short circuit protection Auxilliary Power Power supply 3.5 7 Ranges: 0 psi to 25 psi Ranges: 100 psi to 7500 psi Durable, fiberglass plastic (PBT) CrNi-steel 1.4571 and 1.
3.6 Process Conditions Medium temperatures – 22 °F ... 212 °F ( – 30 °C ... 100 °C) Max.
4 Installation The device should be installed/operated in accordance with the provisions of ElexV, the Device Safety Regulation, this operating manual and generally recognized industry standards. 4.1 Pressure Transmitter Installation The pressure transmitter’s diaphram should not come into contact with hard or sharp objects.
T All functions are programmable once the pressure transmitter has been upgraded with a display unit. The adjusted parameters are stored after the display unit is removed. The display unit can be rotated about 300°, so that it can be read under various installation conditions. The housing cover with built-in display can be fastened to the housing at all four side positions. 4.
4.4 Electrical Connection Please observe local installation regulations (Germany: VDE-Standard). The terminal voltage should not exceed 36 V. Attention The supply voltage is between 12 and 36 V DC (12 and 30 V for intrinsic safety devices). The power supply and the output signal are conducted across a two-wire cable (max. 12 mm outer diameter, max. 14 AWG) and connected in accordance with the pin configuration.
Terminal Configuration Ground L- Positive Output L+ Positive Supply I Test circuit; connect the ampere meter between terminals L+ and I The unit must be properly grounded in order to guarantee EMC resistance. 4.5 Pressure Compensation when using a Relative Pressure Sensor A Gortex diaphram is used to compensate for the atmospheric pressure under the IP 65 Protection Method. A special cable with capillaries for relative pressurization is used for Protection Method IP 67.
5 Operation of Devices without Displays 5.1 Preparation This unit can be programmed before or after installation. T DCC:8I 6C 6BE:G: B:I:G ID I=: 9:K>8: H DJIEJI 7:IL::C I:GB>C6AH % 6C9 ' T )DI: I=6I 6;I:G :68= 68I>DC 6 7G>:; DH8>AA6I>DC 9:;A:8I>DC D; B D88JGH K:G>;>86 I>DC D; 6 HJ88:HH;JA 68I>DC .
5.3 Calibration with Pressure 5.3.1 Zero Point Calibration Determine if the pressure to be used as the zero point (P 0 %), is present at the transmitterer diaphragm before calibration. Calibration Value meas Zero point calibration 5.3.2 Span Calibration Calibration of the measurement range (span). Ensure that the pressure to be used as the span end-point (P 100 %) is present at the transmitter diaphragm.
5.4 Calibration without Pressure Determine the current reference values for the zero point and the span to be entered in the transmitter before calibration. This is done as follows: 5.4.1 Zero Point Calibration T :I:GB>C: I=: =N9GDHI6I>8 EG:HHJG: D; I=: A>FJ>9 H HJG;68: I=6I B::IH I=: O:GD ED>CI T 9?JHI I=>H EG:HHJG: >C EGDEDGI>DC ID I=: H:CHDG H CDB>nal pressure range.
Example: A pressure transducer with 0 ... 400 mbar (nominal pressure) is to be programmed. The liquid’s surface (with a density of 1) is 1 m above the diaphragm at the zero point. The maximum (span end-point) should be 3 m.
5.5 Integration Time (Dampening) Adjustment The following integration time settings can be used: 0, 1, 5, 20 and 40 s. The sensor’s measured values can then be averaged using the adjusted integration time. Calibration Value Calibration Value Calibration of the integration time 5.6 Reset to Default All default data settings are restored by simultaneously pressing the "zero", "esc" and the "ok" buttons for 2 seconds (see Para. 6.4). Important 17 Calibrated special measurement ranges i. e.
6 Operation of Devices with Displays 6.1 The Display In order to program the device, remove the display with a screwdriver and re-attach it to the housing as shown in the diagram below.
6.2 Key Functions Button Functions Main Menu Sub-menu Edit Functions back to the previous menu option back to the previous menu option increase value forward to next menu option forward to next menu option decrease value back to value display without saving back to main menu without saving back to the sub-menu without saving to the sub-menu to the edit functions save value activate keypad (push simultaneously; 2 s) 6.
6.4 Default Data (factory setting) Function Display Def aults Unit of measurement (Line 1) Line 2 Line 3 Temperature display (in °C) Sensor’s nominal pressure range (in bar) zero 4 mA = nom. pressure range start span 20 mA = nom. pressure range end C alibration Output Pressure display (in bar) Damping Inversion Fault Limits I-offset 0s no 21 mA (upscale) 3.8 ... 20.
6.
6.5.1 Main Menu: Display The density of a medium must be entered to calculate the correct fill-level when displaying or adjusting the level in hight units (e.g. mm, m, feet, inch)(see 6.5.6). )0.+"6 -.1)-,0 2,)1 )0.+"6% 2,)1 @98 0 2,)1 < .8 )0.+"6 /-4 /-4 %"02/% /-4 #+",* /-4 ), 3"+2% 0 ? B< DB @ 8B C8? 0 ? @8 B @A F /-4 %"02/% %,1 0 ? B< DB @ @ @ C8? B 0 ? B< DB @ @ @ 1 @A $ /-4 1% .%/"12/% 1% .
)0.+"6 /-4 /-4 %"02/% /-4 #+",* /-4 ), 3"+2% 1< ? B< DB @ 8B C8? 1< ? @8 B @A F /-4 %"02/% %,1 /-4 1% .%/"12/% 1< ? B< DB @ @ @ C8? B 1% .%/"12/% $ 1% .%/"12/% & /-4 "5 3"+2% /-4 %"02/% %,1 /-4 1% .%/"12/% 1% .%/"12/% $ 23 1% .%/"12/% $ 1< ? B< DB 1 @A $ 1% .%/"12/% & 1< ? B< DB 1 @A & /-4 $2//%,1 @" 1< ? B< DB A B C8? /-4 .
6.5.2 Main Menu: Calibration of zero and span "), %,2 $"+)#/"1)-, $"+)#/"1% /",'% $"+)#/"1% 4)1( ./%002/% $"+)#/"1% 0%1 7%/- $"+)#/"1% 0%1 0.", $"+)#/"1% 4)1(-21 ./%002/% " = B @ 7 . " = B @ 0A8 $"+)#/"1% %&),% 7%/- %&),% 7%/- " = B @ G A C 8 F : 8 A BB C8? D < < @ 8? A BB 8 ; $"+)#/"1% %&),% 0.", %&),% 0.
6.5.3 Main Menu: Output " .),' " .),' " .),' " .),' "), %,2 -21.21 -21.21 %&),)1)-, -21.21 " .),' -21.21 ),3%/0)-, " .),' -21.21 /%3%/0)-, 8@A ; B 8 C 8@A ; B 8 C 8@A ; B 8 C 8@A ; B 8 C 8@A ; B 8 C - A B C @" C @" -21.21 "+"/ %//-/ "?8 @ 8 @" D B 8? "?8 @ 8 @" AB 8? -21.
6.5.4 Main Menu: Evaluation 1< ? C ? C8? 8 C ? @ C8? 8?D8FB 9 8 = B C I B 8 C8? A8 "), %,2 %3"+2"1)-, %3"+2"1)-, &2$1)-,0 %3"+2"1)-, /%& 1"#+% /%& .-),1 ),0%/1 ),0%/1 %+%1% ),0%/1 1< B ? 8; C8? A8 B ? % F : 8 D C8? A8 : < 89? B 8 > ? 8 G8 % F : < ? C ? 8B 8 % F : < 8BB 8 C ? @ 8B 8 ) B A BB 9? A C8? A8 B 1< C8? A8 : . 8 . 8 IE %+%1% /%& .
Example: Level 100 %: 4000 mm Density: 1 g/cm3 Density correction: 0.9 g/cm3 Span end point: ( )%%% bb m \$Xb 4000 mm 1 g/cm ------------------------------------------------- = 4444 mm (3 %#. \$Xb 0.9 g/cm 3 The span (end-point) must be re-calibrated (with or without pressure) to 4000 mm in order to prevent a 4000 mm level tank from being overfilled. Important A change or correction in the density causes a change in the span endpoint’s unit of measure (mm, m, inch, feet).
6.5.6 Main Menu: Service "), %,2 0%/3)$% 0%/3)$% &2,$1)-,0 -2,1),' $-//%$1)-, 0%/3)$% +--.1%01 ; B A : @ B B @ B 9 ?F A B @ 8 D < A BB $)/$2)1 1%01 1< B C8? B B 8B < B B ; 8? ? < B 9 B A BB 0%/3)$% %3)$% "1" 0%/3)$% 1) %/ 0%/3)$% /%0%1 /%0%1 1) %/ /%0%1 ), "5 3"+2%0 0%/3)$% .
7 Diagnostics and Service If the fault cannot be corrected, the device should be taken out of operation and stored to prevent re-installation. Attention Repairs should only be performed by the manufacturer. All other repairs or alterations are unauthorized. Attention The following error messages can appear on devices with displays (see also para. 2.1.
9 Appendix 9.1 Dimension Diagrams 3.39” ( ) ) 6.42” (163) 3.72” ( .81” (20.5) 1.61” (41) 61B ) 6.06” (154) 3.72” ( (mm) .71” (18) 1.
9.2 Warranty Conditions The pressure transmitter has a 3 year warranty. Repairs may only be performed by the manufacturer. All other repairs and device alterations are unauthorized and will void the warranty. Attention 9.3 Glossary Adjustment Allocation of the signal output range (4 ... 20 mA) to the desired pressure measurement range or level measurement range.
Notes:
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