GESTRA NRGT 26-2n Original Installation & Operating Manual Download Page 1

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Original Installation &

Operating Manual

E N

E n g l i s h

Level Transmitter

NRGT 26-2n

850879-00

Summary of Contents for NRGT 26-2n

Page 1: ...Original Installation Operating Manual E N English Level Transmitter NRGT 26 2n 850879 00 ...

Page 2: ...erall view of the NRGT 26 2n 19 Dimensions of the NRGT 26 2n 20 Preparing for installation 21 Installation 22 Installing the NRGT 26 2n 23 Sealing surface dimensions of the NRG 26 2n 23 Example 23 Installing two level electrodes in a flange 24 Installation 25 Installing two level electrodes in a flange by detaching a terminal box 25 Installing two level electrodes in a flange by detaching a termin...

Page 3: ... value 38 Setting the filter constant Filt 38 Manually initiating a display test 39 Checking the level display by raising or reducing the level 39 Checking function by initiating a test function 39 Starting operation and testing 40 System malfunctions 43 Causes 43 Indication of system malfunctions using error codes 44 Common application and usage errors 46 Checking installation and function 48 Tak...

Page 4: ...ly reproduction and dissemination to third parties is not permit ted The General Terms Conditions of GESTRA AG apply Scope of delivery Product package 1 x level transmitter NRGT 26 2n 1 x sealing ring D 27 x 32 form D DIN 7603 2 4068 bright annealed 1 x Installation Operating Manual Required accessories for NRGT 26 2n when installing for the first time 1 x cable jack Phoenix Contact SACC M12FS 5PL...

Page 5: ...d follow all instructions Please also read the instructions for use of any accessories The Installation Operating Manual is part of the product package Keep it in an easily accessible location Availability of this Installation Operating Manual Make sure this Installation Operating Manual is always available to the operator If you pass on or sell the equipment to a third party please also hand over...

Page 6: ...ituation that results in death or serious injury WARNING Warning of a dangerous situation that may possibly result in death or serious injury CAUTION Warning of a situation that may result in minor or moderate injury ATTENTION Warning of a situation that results in damage to property or the environment ...

Page 7: ...rating point of the system The operating point describes the operating parameters within which a system or boiler is operated in its nominal range In a pressurised steam boiler for example these parameters would be output capacity pressure and temperature The design data may be a lot more stringent however A boiler that is operated at 10 bar and 180 C may be designed for a pressure of 60 bar and a...

Page 8: ...ulating media However a conductivity of less than 100 μS cm has a major influence on the measured capac itance which is why recalibration of the measuring range see page 37 at the operating point and after a cold start is extremely important Operating point of the system see page 7 To achieve the best possible reproducibility and maintain high quality measurements see Technical data on page 14 the...

Page 9: ...e Installation Operating Manuals for the system components used You can find the latest Installation Operating Manuals for other system components on our website http www gestra com Improper use There is a danger of death due to explosion if the equipment is used in potentially explo sive atmospheres Do not use the equipment in potentially explosive atmospheres Do not bring any equipment into serv...

Page 10: ...ck that the system is not carrying live voltage before commencing work Danger to life from a faulty NRGT 26 2n level electrode due to the sudden escape of hot steam or hot water Shocks and impacts during transport or installation can result in damage to or leaks in the level electrode causing pressurised hot steam or hot water to escape through the pressure relief hole To prevent damage during tra...

Page 11: ...ork Specialist staff Maintenance and conversions may only be performed by authorised staff who have undergone specific training Refits Specialist staff Persons trained by the plant operator to work with pressure and temperature Fig 1 Notes on product liability The manufacturer cannot accept any liability for damages resulting from improper use of the equipment Check the current output regularly Ch...

Page 12: ...ysis These transmitters do not have any controlling or limiting functions The level transmitter is installed on the inside of steam boilers tanks or feed lines of hot water installa tions A protective tube see Installation examples on page 27 provided on site keeps the transmitter functioning reliably A capacitance NRGT 26 2n level transmitter and a conductivity NRG 1x 60 or NRG 1x 61 level electr...

Page 13: ...he benefits of high resolution readings in the sight glass range Behaviour in the event of malfunctions The error state or malfunction is permanently shown on the display by an error code e g E 005 For more on error codes see page 44 Every time there is a fault 0 mA is output via the current output Faults are displayed based on their priority Indications with higher priority are shown conti nuousl...

Page 14: ...Materials Terminal box 3 2581 G AlSi12 powder coated Cover tube 1 4301 X5 CrNi 18 10 Electrode rod insulation PTFE Screw in body 1 4571 X6CrNiMoTi17 12 2 Max electrode length at 238 C all measurements in mm NRGT 26 2n Max electrode length 373 477 583 688 794 899 1004 Measuring range 300 400 500 600 700 800 900 Max electrode length 1110 1214 1319 1423 1528 1636 2156 Measuring range 1000 1100 1200 1...

Page 15: ...be monitored Supply voltage 24 V DC 20 Power consumption Max 7 W Current input Max 0 3 A Internal fuse T2A slow blow Safety cutout at excessive ambient temperature The cutout at excessive ambient temperature takes place at Tamb 75 C Analogue output 1 x actual value output 4 20 mA proportional to level galvanically isolated Maximum output load 500 Ω M12 connector 5 pole A coded Indicators and contr...

Page 16: ... temperature 40 C 80 C Transport temperature 40 C 80 C Air humidity 10 95 non condensing Weight dependent on length of electrode NRGT 26 2n approx 1 8 kg with 300 mm measuring range Admissible installation positions Vertical Oblique to a maximum inclination of 45 In this case the length of the electrode rod is limited to 688 mm maximum ...

Page 17: ... Safety note Equipment designation Nominal pressure rating connection thread material of screw in body Equipment function Admissible service pressure admissible temperature Current approval conformity mark Manufacturer Serial number IP rating Supply voltage Protection class Disposal information Fig 2 Measuring range Actual value output Admissible ambient temperature Power consumption ...

Page 18: ...ry settings The NRGT 26 2n level transmitter has the following factory settings Menu display Parameter values Unit CAL L variable 0 Raw value hex approx 50 mV CAL P variable 25 Raw value hex CAL H variable 100 Raw value hex approx 2 0 V FiLt 0005 seconds Fig 3 ...

Page 19: ...el with 4 digit LED display malfunction and status LEDs and rotary knob see page 40 C Cover screws M4 x 16 mm D M12 connector 5 pole A coded F Seal seat for sealing ring I Electrode G Sealing ring D 27 x 32 form D DIN 7603 2 4068 bright annealed E Cover tube simplified view H Electrode thread J Electrode rod insulation PTFE ...

Page 20: ...rs in mm OK 140 G Size 41mm A F 0 Nm 50 70 90 110 120 100 80 60 41 175 w 70 26 2 37 1 338 20 Thermal insulation provided at the site Ø 15 1 2 Max electrode length at 238 C Measuring range 373 300 477 400 583 500 688 600 794 700 899 800 1004 900 1110 1000 1214 1100 1319 1200 1423 1300 1528 1400 1636 1500 2156 2000 ...

Page 21: ... below freezing At temperatures below freezing use a suitable heat source e g control cabinet heater etc Connect all parts of the system to a central earthing point to prevent equalisation currents Use a cover to protect the equipment from direct sunlight condensation and heavy rain Use UV resistant cable ducts for routing the connecting cable Take further measures to protect the equipment from li...

Page 22: ...ns in the system or the level electrode Inspect the sealing surfaces of the tank standpipe or flange cover to ensure they are per fectly machined see Fig 6 Do not shorten the electrode rod Take care not to bend the level electrode during installation Do not subject the electrode rod to hard impacts Do not install the terminal box A or upper part of the electrode cover tube E in the boiler thermal ...

Page 23: ...sions of the NRG 26 2n Fig 6 2 Push the supplied sealing ring G onto the seal seat F of the electrode or lay it on the sealing surface of the flange DANGER Danger to life from escaping hot steam if incorrect or defective seals are used Only use the supplied sealing ring for sealing the electrode thread H Sealing ring D 27 x 32 DIN 7603 2 4068 bright annealed Prohibited seal materials Hemp PTFE tap...

Page 24: ...al box max 180 a half turn in the desired direction This is often sufficient for alignment If and only if this option is not sufficient completely disconnect the terminal box from the electrode and mount it again later on see the steps below ATTENTION Incorrect installation can lead to malfunctions in the system or the level electrode The steps below must be carried out exclusively by the manufact...

Page 25: ...e lug C Detach the connecting cables from the terminals F 4 Slacken the fixing nut D in the terminal box of the second electrode using a size 19 open ended spanner 5 You can now remove the terminal box or screw it onto the electrode When the terminal box is removed completely all detached connecting cables must be routed through the detached fixing nut and the hole in the terminal box 6 Install th...

Page 26: ...re the terminal box is correctly orientated aligned position it correctly in advance 9 Tighten the fixing nut in the terminal box to a torque of 25 Nm 10 Reconnect the electrode wiring to the PCB see table in Fig 8 If necessary join the connecting cables in the terminal box together using cable ties 11 Finally check the wiring one more time 12 Close the rear panel of the second electrode terminal ...

Page 27: ...nstallation examples with dimensions for the NRGT 26 2n Protective tube provided on site for internal installation Illustration not to scale See the key on page 32 All lengths and diameters in mm Fig 9 G DN 50 Ø 20 20 90 Ø 20 1 2 0 4 5 6 8 3 26 9 x 14 2000 ...

Page 28: ...tallation examples with dimensions for the NRGT 26 2n Protective tube provided at the site for internal installation Illustration not to scale See the key on page 32 All lengths and diameters in mm Fig 10 G DN 50 Ø 20 20 26 Ø 20 90 2000 1 2 3 4 5 6 0 x 9 14 8 ...

Page 29: ... for the NRGT 26 2n Protective tube provided at the site for internal installation combined with other equipment from GESTRA AG Illustration not to scale See the key on page 32 All lengths and diameters in mm Fig 11 G G DN 100 24 5 26 0 20 Ø 20 14 2000 26 90 Ø 20 1 2 3 4 5 7 8 0 24 5 26 0 9 x ...

Page 30: ...0879 00 Installation examples with dimensions for the NRGT 26 2n Level pot DN 80 for external use Illustration not to scale See the key on page 32 All lengths and diameters in mm Fig 12 2 G DN 20 HW DN 2 LW DN 2 DN 20 1 4 0 DN 20 26 x 9 14 5 8 2000 ...

Page 31: ...in steam boilers The level electrode or level transmitter must not be installed at an inclination of more than 45 maximum and the length of the electrode rod is then limited to 688 mm maximum equivalent to measuring range H 600mm Illustration not to scale All lengths and diameters in mm max 45 DN 100 1 2 0 m a x 6 8 8 Tube e g 33 7 x 3 2 1 3 3 ...

Page 32: ... 6 Protective tube DN 80 DN 100 in France as per AFAQ 7 Protective tube DN 100 8 Distance between electrode rod and protective tube 14 mm 9 Minimum dimension x 10 mm below the maximum electrode length for electrode length see page 20 0 Lowest possible LW mark end of measuring range Reducer EN 10253 2 K 88 9 x 3 2 42 4 x 2 6 W Reducer EN 10253 2 K 114 3 x 3 6 48 3 x 2 9 W Level pot DN 80 Centre dis...

Page 33: ...9 00 Functional elements of the NRGT 26 2n Fig 14 Example NRGT 26 2n A Terminal box B Cover screws M4 x 16 mm C Operating panel with 4 digit LED display malfunction and status LEDs and rotary knob see page 40 D M12 connector 5 pole A coded OK A B C D ...

Page 34: ...d with 24 V DC A safety power supply unit that delivers a Safety Extra Low Voltage SELV and is isolated from con nected loads must be used to supply the equipment with 24 V DC Connecting the actual value output 4 20 mA Please note the maximum output load of 500 W Maximum cable length 100 m Pin assignment of the M12 connector for non pre wired control cables If non pre wired control cables are used...

Page 35: ...age Changing the factory settings if necessary You will need the following tools Slotted screwdriver size 2 5 Notes for bringing into service for the first time When bringing into service for the first time the 0 100 scale of the measuring range is set ex works at a maximum for the corresponding electrode length After installation set the measuring range to effective system specific values ...

Page 36: ...le value range By pressing the knob briefly you can jump to the next digit This is a more convenient way of making large changes to values Bringing into service Selecting and setting a parameter 1 Using the screwdriver turn the rotary knob clockwise or anti clockwise until the desired parameter appears on the display The set value is displayed after approx 3 seconds The display alternates between ...

Page 37: ...g point If you set the measuring range while the fluid is cold the settings will change on exposure to heat and will then need to be corrected at the operating point Calibration to the lower limit of the active measuring range CAL L 0 calibration value Bring the level to 0 and perform calibration Pay attention to the setting instructions on page 36 and proceed as follows 1 Reduce the level of wate...

Page 38: ... of the active measuring range CAL H 100 calibration value Calibration with CAL H ensures the best possible accuracy for setting the measuring range Pay attention to the setting instructions on page 36 and proceed as follows 1 Raise the water level in the boiler to the 100 limit of the desired measuring range 2 Select the parameter CAL H After approx 3 seconds the old value is shown in hexadecimal...

Page 39: ...or not at all you must replace the level transmitter with an identical one from GESTRA AG Checking the level display by raising or reducing the level Incorrectly installed or bent level electrodes result in a loss of function that can jeopard ise system availability Therefore proceed as follows when bringing into service and when replacing level electrodes Check the level display by raising and lo...

Page 40: ...tion and settings OK Notes on the priority of the various indications Fault indications are displayed based on their priority Indications with higher priority are shown continuously before those with low priority If several indications need attention the display does not alternate between them Priority of error code display Higher priority error codes overwrite lower ones on the display See page 4...

Page 41: ...Displays the current level as of the calibrated measuring range See the following pages for more information and tables Behaviour in the event of a malfunction error code display On the occurrence of a fault Display e g E005 LED 1 Fault LED lights up red An error code is permanently displayed see error codes on page 44 There is an active fault LED 2 Operating LED is OFF A fault is present In the e...

Page 42: ...al 4 mA or 20 mA Display 0000 or 0100 The test simulates water falling below the LW mark or rising above the HW mark The simulated reading is displayed for each test LED 2 Operating LED lights up green Test function is active LED 1 Fault LED is OFF No fault The current output can be simulated and tested When the rotary knob is released the test ends Faulty equipment is a risk to system availabilit...

Page 43: ...erms of temperature vibration interference sources minimum distances etc Wiring Does the wiring conform to the wiring diagrams Does the 4 20 mA current loop have the correct polarity and is it closed Is the 4 20 mA current loop below the overall output load of 500 Ω ATTENTION ATTENTION An open circuit in the 4 20 mA current loop can cause a system shutdown and a malfunction is indicated Bring the ...

Page 44: ... between channels 1 and 2 exceeds 10 error toler ance internal short circuit Damage to electrode rod PTFE e g crack Replace the level transmitter E 005 MaxCh1Err Channel 1 reading above maximum possible internal short circuit Damage to electrode rod PTFE e g crack Replace the level transmitter E 006 MinTSTCh1Err Channel 1 reading internal capacitance 47pF Replace the level transmitter E 007 MaxTST...

Page 45: ...ace the level transmitter E 019 V6Err System voltage 6 V outside tolerance Replace the level transmitter E 020 V5Err System voltage 5 V outside tolerance Replace the level transmitter E 021 V3Err System voltage 3 V outside tolerance Replace the level transmitter E 022 V1Err System voltage 1 V outside tolerance Replace the level transmitter E 023 V12Err System voltage 12 V outside tolerance Replace...

Page 46: ...edy The pressure relief hole is clogged or flooded or may even be missing completely Check the protective tube If necessary add a pressure relief hole The stop valves of an externally mounted measuring cylinder optional are closed Inspect the stop valves open if necessary A correctly set electrode that has been in operation for a long period delivers increasingly imprecise readings Possible causes...

Page 47: ... Check all electrical connections The equipment fails to work The display is on and the LEDs light up Possible causes if no error messages appear Remedy The earth connection to the tank is interrupted Clean the sealing surfaces Screw in the NRGT 26 2n level electrode with a metal sealing ring see page 23 Flashing values from t 71 to t 75 appear on the display Possible causes Remedy The ambient tem...

Page 48: ...g point Also check that the level remains within the MIN and MAX limits when limit indicators are connected Check the switchpoints when bringing into service and every time the NRGT 26 2n level transmitter is replaced System malfunctions of the NRGT 26 2n level transmitter result in an output of 0 mA at the analogue output If you require assistance please tell us the indicated error code In the ev...

Page 49: ...e Only remove the level electrode at a boiler pressure of 0 bar WARNING The hot level electrode can cause severe burns The level electrode becomes very hot during operation Always let the level electrode cool down before performing installation and maintenance work Only remove level electrodes that have cooled down Proceed as follows 1 Reduce the boiler pressure to 0 bar 2 Allow the level electrod...

Page 50: ...ntaminated before being returned to GESTRA AG The term media can refer to solid liquid or gaseous substances or mixtures as well as radia tion GESTRA AG can accept returned products only if accompanied by a completed and signed return note and also a completed and signed declaration of decontamination The return confirmation and declaration of decontamination must be attached to the outside of the...

Page 51: ...est version of the Declaration of Conformity from www gestra com and re quest relevant certificates by writing to the following address GESTRA AG Münchener Straße 77 28215 Bremen Germany Tel 49 421 3503 0 Fax 49 421 3503 393 e mail info de gestra com Website www gestra com Modifications to the equipment not approved by us will invalidate the Declarations of Conformity and the certificates Declarat...

Page 52: ...o de gestra com Website www gestra com You can find our authorised agents around the world at www gestra com 850879 00 05 2022cm 809182 00 GESTRA AG Bremen Printed in Germany UK Importer GESTRA UK Ltd Unit 1 Sopwith Park Royce Close West Portway Business Park Andover Hampshire SP10 3TS United Kingdom ...

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