GESTRA NRGT 26-2 Original Installation & Operating Manual
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GESTRA NRGT 26-2 Original Installation & Operating Manual

Level transmitter
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E n g l i s h
Level Transmitter
NRGT 26-2
in Non-Standard
Lengths
Original Installation &
Operating Manual
850973-00

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Summary of Contents for GESTRA NRGT 26-2

  • Page 1 Level Transmitter NRGT 26-2 in Non-Standard Lengths Original Installation & Operating Manual 850973-00 E n g l i s h...

  • Page 2: Table Of Contents

    Connecting the 24V DC power supply ...................... 32 Connecting the actual value output (4 – 20 mA) ..................32 Pin assignment of the M12 connector for non pre-wired control cables ........... 32 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 3 Cleaning the measuring electrode of the level transmitter ................ 50 Cleaning interval ............................50 Disposal ................................ 50 Returning decontaminated equipment ......................50 Declaration of Conformity; Standards and Directives ................. 51 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 4: Content Of This Manual

    Connecting cable, M12 A-coded, 10m, mat. no. 1508394 ■ Connecting cable, M12 A-coded, 30m, mat. no. 1508395 ■ Optional accessories or refit Cable jack M12 A-coded, mat. no. 52820 ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 5: How To Use This Manual

    How to use this Manual This Installation & Operating Manual describes the correct use of the NRGT 26-2 level transmitter. It applies to persons who integrate this equipment into control systems, install, bring into service, operate, maintain and dispose of this equipment. Anyone carrying out the above-mentioned activities must have read this Installation &...

  • Page 6: Types Of Warning

    CAUTION Warning of a situation that may result in minor or moderate injury. ATTENTION Warning of a situation that will result in damage to property or the environment. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 7: Specialist Terms/Abbreviations

    In a steam boiler, for example, these parameters would be output, pressure and tempera- ture. The pressure at the operating point does not have to match the design pressure, but is the same or lower. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 8: Usage For The Intended Purpose

    Usage for the intended purpose Use as a water level controller The NRGT 26-2 level transmitter can be used to continually measure the water level in steam boiler and hot-water installations, or in condensate and feedwater tanks. In the calibrated measuring range from 0% to 100%, the level transmitter makes up the linear profile of the 4 –...

  • Page 9: Improper Use

    Check that the plant is not carrying live voltage before commencing work. ■ Danger to life from a faulty NRGT 26-2 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.

  • Page 10: Required Personnel Qualifications

    Specialist staff with pressure and temperature. Fig. 1 Notes on product liability We the manufacturer cannot accept any liability for damages resulting from improper use of the equip- ment. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 11: Function

    Function Measuring process The NRGT 26-2 level transmitter uses the capacitance measurement principle and converts level data into a level-dependent 4 – 20 mA current signal. The 0 – 100% measuring range can be scaled by modifying the effective length of the electrode rod.
  • Page 12 Electrode faults cannot be acknowledged. When the fault is corrected, the message disappears from the display and the NRGT 26-2 level transmitter returns to normal operation. * The tables on pages 41 - 42 clearly show the relationship between the equipment status, the display and the status LEDS.

  • Page 13: Technical Data

    Max. installed length at 238 °C, all measurements in mm NRGT 26-2 ■ Max. installed length: 2260 2365 2470 2575 2680 Measuring range: 2100 2200 2300 2400 2500 Do not shorten the electrode rod. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 14 1 x rotary knob IP65 with button for menu navigation and test function ■ Protection class III Safety Extra Low Voltage (SELV) ■ IP rating to EN 60529 IP 65 ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 15 Air humidity: 10% – 95% non-condensing ■ Weight (dependent on length of electrode) NRGT 26-2 approx. 2.9 kg (with 2100 mm measuring range) ■ Admissible installation positions Vertical ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 16: Example Name Plate/Identification

    GESTRA AG Münchener Str.77 28215 Bremen Made in Germany Fig. 2 The date of production (quarter and year) is stamped on the screw-in body of the level trans- mitter. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 17: Factory Settings

    Raw value (hex) CAL.L variable approx. 50 mV CAL.P variable Raw value (hex) Raw value (hex) CAL.H variable 100% approx. 2.0 V FiLt 0005 Seconds - - - Fig. 3 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 18: Overall View Of The Nrgt 26-2

    Cover tube (simplified view) Seal seat for sealing ring Sealing ring D 27 x 32, form D, DIN 7603-2.4068, bright annealed Electrode thread Electrode Electrode rod insulation, PTFE Fig. 4 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 19: Dimensions Of The Nrgt 26-2

    Max. Measuring installed length range at 238 °C Ø 15 2260 2100 2365 2200 2470 2300 2575 2400 2680 2500 Fig. 5 All lengths and diameters in mm NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 20: Preparing For Installation

    Take further measures to protect from harmful environmental influences such as lightning, ■ insects and animals, and salty air. You will need the following tools: NRGT 26-2 Torque wrench (with size 41 open-ended spanner attachment), see page 19. ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 21: Installation

    To prevent current leaks, maintain a minimum distance of 14 mm between the electrode ■ and earth (flange or tank wall). Check the boiler standpipe and flange during the preliminary boiler inspection. ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 22: Installing The Nrgt 26-2

    H. Sealing ring D 27 x 32 ◆ DIN 7603-2.4068, bright annealed Prohibited seal materials: Hemp, PTFE tape ■ Conductive pastes ■ Fig. 7 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 23: Installing Two Level Electrodes In A Flange By Detaching A Terminal Box

    If necessary, apply a small quantity of silicone grease (e.g. Molykote ® Screw the NRGT 26-2 level electrode into the tank standpipe or flange cover, and tighten securely using a torque wrench (with size 41 open-ended spanner attachment). Tighten to the torques stated below.

  • Page 24: Installing Two Level Electrodes In A Flange By Detaching A Terminal Box

    Install the second electrode in the flange. Next, route all connecting cables through the hole in the terminal box and the nut once again. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 25: Installing Two Level Electrodes In A Flange By Detaching A Terminal Box

    Finally, check the wiring one more time. Close the rear panel of the terminal box of the second electrode and screw back on. Installation example with dimensions, see Fig. 11, page 28 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 26: Installation Example With Dimensions For The Nrgt 26-2

    Protective tube (provided by the customer) for internal installation Illustration not to scale. Key, see page 30 G ¾ DN 50 ≥ 14 ≤ 90° Ø 20 Fig. 9 All lengths and diameters in mm NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 27 Protective tube (provided by the customer) for internal installation. Illustration not to scale. Key, see page 30 G ¾ DN 50 ≥ 14 ≤ 90° Ø 20 Fig. 10 All lengths and diameters in mm NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 28 Illustration not to scale. Key, see page 30 G ¾ G ¾ DN 100 24.5-26.0 24.5-26.0 ≥ 14 " ≤ 90° Ø 20 Fig. 11 All lengths and diameters in mm NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 29 Illustration not to scale. Key, see page 30 G ¾ ≥ DN 20 ≥ 14 § ≥ DN 20 ≥ DN 20 Fig. 12 All lengths and diameters in mm NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 30: Positioning The Terminal Box

    If necessary, you can orientate the display in the desired direction by rotating the terminal box. ATTENTION Rotating the terminal box ≥ 180° will damage the internal wiring of the NRGT 26-2 level transmitter. Never rotate the terminal box more than 180 degrees in either direction.

  • Page 31: Functional Elements Of The Nrgt 26-2

    Example Cover screws M4 x 16 mm NRGT 26-2 Operating panel with 4-digit LED display/malfunction and status LEDs and rotary knob, see page 40 M12 connector, 5-pole, A-coded NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 32: Electrical Connection

    If non pre-wired control cables are used, you must wire the cable to match the pin assignment of the M12 connector. Shield + 24 V Power supply Power supply Current output (4 – 20 mA) Current output (4 – 20 mA) Connector Fig. 14 NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 33: Bringing Into Service

    38. Default ex-works password The default password is “1902” and cannot be changed. Password protection is available from software version S-16 onwards. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 34 The display then alternates between the selected parameter and its current value. Keep pressing the rotary knob until the current parameter value flashes on the display. Move on to step 8. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 35 CAL.H = calibrate end of measuring range to 100% ■ Filt = filter constant ■ diSP = initiate a display test ■ InFo = show software version and equipment type ■ = enable/disable password protection ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 36: Calibration At The Lower Limit Of The Active Measuring Range "Cal.l" (0% Calibration Value)

    Press and hold the rotary knob until the value (e.g. 0025) appears. The last digit flashes. Set the desired reading to > 25% to match the set level. Save your setting by pressing and holding the rotary knob for approx. 1 second. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 37: Calibration At The Upper Limit Of The Active Measuring Range "Cal.h" (100% Calibration Value)

    Faulty equipment jeopardises plant safety. If numbers or decimal points are displayed incorrectly or not at all, you must replace the ■ level transmitter with an identical one from GESTRA AG. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 38: Viewing The Software Version And Equipment Type "Info

    Turn the rotary knob and set the desired status. on = password protection is enabled ■ oFF = password protection is disabled ■ Press and hold the rotary knob until “donE” is displayed. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 39: Checking The Level Display By Raising Or Reducing The Level

    Always perform this check with the plant at its operating point. Never start up any plant that has not passed the above tests. ■ NRGT 26-2 level transmitters may only be repaired by the manufacturer, GESTRA AG. ■ Only replace faulty equipment with identical equipment from GESTRA AG. ■...

  • Page 40: Starting, Operation And Testing

    Priority of error code display Higher priority error codes overwrite lower priority ones on the display! See page 44 ff. for fault indications and the error code table. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 41 In the event of a fault or error state, an analogue value of 0 mA is displayed. ■ Electrode faults cannot be acknowledged. When a fault is corrected, the message disappears from the display, and the level transmitter returns to normal operation. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 42 If the level transmitter does not behave as described above, the equipment may be faulty. ■ Perform failure analysis. ■ The NRGT 26-2 level transmitter may only be repaired by the manufacturer, GESTRA AG. ■ Only replace faulty equipment with identical equipment from GESTRA AG. ■...

  • Page 43: System Malfunctions

    Switch off the voltage to the plant and secure so that it cannot be switched back on. ■ Check that the plant is not carrying live voltage before commencing work. ■ NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 44: Indication Of System Malfunctions Using Error Codes

    Replace the level transmitter measurement signal Channel 2 reading with disabled E.011 PWMTSTCh2Err Replace the level transmitter measurement signal E.012 FreqErr Measurement signal frequency Replace the level transmitter. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 45 Generally speaking, electromagnetic interference can be the cause of virtually all of the error codes mentioned above. This is less likely to be the case for permanent errors, but should be considered for sporadic error codes. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 46: Common Application And Usage Errors

    The measuring range is incorrectly set. ■ Inspect the electrode and protective tube for fouling and ■ Fouling on the electrode or protective tube. ■ clean if necessary. System malfunctions NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...
  • Page 47 Reduce the ambient temperature around the terminal ■ If the temperature rises above 75 °C, the error box, e.g. by cooling. code E.027 (Overtemp Err) appears and the 0 mA current output causes a lockout. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 48: Checking Installation And Function

    Check the switchpoints when bringing into service and every time the NRGT 26-2 level transmitter ■ is replaced. System malfunctions of the NRGT 26-2 level transmitter result in an output of 0 mA at the analogue output. If you require assistance, please tell us the indicated error code.

  • Page 49: Taking Out Of Service/Disassembly

    If the terminal box needs to be rotated by >180° in relation to the electrode or needs to be fully removed, proceed as described on pages 23 to 25. NRGT 26-2 in non-standard lengths - Installation & Operating Manual - 850973-00...

  • Page 50: Cleaning The Measuring Electrode Of The Level Transmitter

    GESTRA AG. Such media include solid, liquid or gaseous substances, mixtures of these, or radiation. 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.

  • Page 51: Declaration Of Conformity; Standards And Directives

    You can find details on the conformity of the equipment and the applicable standards and directives in the Declaration of Conformity and associated certificates. You can download the Declaration of Conformity from www.gestra.com and request relevant certificates by writing to the following address: GESTRA AG Münchener Straße 77...
  • Page 52 GESTRA UK Ltd Germany Phone +49 421 3503-0 Unit 1 Sopwith Park, Royce Close, +49 421 3503-393 West Portway Business Park, Andover, e-mail info@de.gestra.com Hampshire SP10 3TS Website www.gestra.com United Kingdom 850973-00/07-2023cm (809211-00) · GESTRA AG · Bremen · Printed in Germany...

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