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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
NRGT 26-2s
Original Installation &
Operating Manual
819876-02

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Summary of Contents for GESTRA NRGT 26-2

  • Page 1 Level Transmitter NRGT 26-2 NRGT 26-2s Original Installation & Operating Manual 819876-02 E n g l i s h...

  • Page 2: Table Of Contents

    Reliability data to EN 61508 ......................... 12 Function ................................ 13 Technical data .............................. 15 Example name plate / Identification of the NRGT 26-2/NRGT 26-2s ............18 Factory settings ............................19 Overall view of the NRGT 26-2 ........................20 Overall view of the NRGT 26-2s ........................21 Dimensions of the NRGT 26-2 ........................
  • Page 3 Contents Installation example with dimensions for the NRGT 26-2 ................30 Positioning the terminal box ........................35 Functional elements of the NRGT 26-2 / NRGT 26-2s ................. 36 Electrical connection ............................ 37 Notes on electrical connection ......................... 37 Connecting the 24 V DC power supply ..................... 37 Connecting the actual value output (4-20 mA)..................

  • Page 4: Content Of This Manual

    1 x level transmitter NRGT 26-2s with flange DN50, PN40, EN 1092-1 ■ 1 x Installation & Operating Manual ■ Required accessories for NRGT 26-2 and NRGT 26-2s when installing for the first time Connecting cable, M12 A-coded, 5m, mat. no. 1508392 ■ Connecting cable, M12 A-coded, 10m, mat. no. 1508394 ■...

  • Page 5: How To Use This Manual

    How to use this Manual This Installation & Operating Manual describes the correct use of NRGT 26-2 and NRGT 26-2s level transmitters. It applies to all 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 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 7: Specialist Terms / Abbreviations

    In a steam boiler, for example, these parameters would be output, capacity, pressure and temperature. The pressure at the operating point does not have to match the design pressure, but is the same or lower. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 8: Usage For The Intended Purpose

    Usage for the intended purpose Use as a water level controller NRGT 26-2 and NRGT 26-2s level transmitters can be used to continually measure the water level in steam boiler and hot water installations or in condensate and feedwater tanks. The calibrated measuring range from 0% to 100% constitutes the linear profile of the 4-20 mA current output.

  • 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 or NRGT 26-2s level electrode due to the sudden escape of hot steam or hot water. Jolts 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 11: Functional Safety, Safety Integrity Level (Sil)

    Functional safety, safety integrity level (SIL) NRGT 26-2 and NRGT 26-2s level transmitters have a secure 4-20 mA actual value output (SIL 2). If a diagnostic tester that also has a SIL 2 rating is connected to the 4-20 mA output, the entire event chain system can be operated at this safety integrity level.

  • Page 12: Reliability Data To En 61508

    Fraction of undetected dangerous failures beta = 2% that have a common cause Fraction of detected dangerous failures that beta d = 1% have a common cause Fig. 2 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 13: Function

    (see page 30 “Installation examples”). A capacitive NRGT 26-2 or NRGT 26-2s level transmitter and a conductive NRG 1x-60 or NRG 1x-61 level electrode can be installed in the same protective tube or level pot.
  • Page 14 Electrode faults cannot be acknowledged. When the fault is corrected, the message disappears from the display, and the NRGT 26-2 or NRGT 26-2s level transmitter returns to normal operation. * The tables on pages 46 - 47 clearly show the relationship between the equipment status, the display and the status LEDS.

  • Page 15: Technical Data

    Max. installed length: 1053 Measuring range: Max. installed length: 1157 1262 1366 1471 1579 2099 Measuring range: 1075 1175 1275 1375 1475 1975 Do not shorten the electrode rod. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 16 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 17 ■ 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. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 18: Example Name Plate / Identification Of The Nrgt 26-2/Nrgt 26-2S

    GESTRA AG Münchener Str.77 28215 Bremen Made in Germany Fig. 3 The date of production (quarter and year) is stamped on the screw-in body of the level trans- mitter. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 19: Factory Settings

    Factory settings NRGT 26-2 and NRGT 26-2s level transmitters are delivered ex-works with the following settings. Menu display Parameter values Unit Raw value (hex) CAL.L variable approx. 50 mV CAL.P variable Raw value (hex) Raw value (hex) CAL.H variable 100% approx.

  • Page 20: Overall View Of The Nrgt 26-2

    Sheath (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. 5 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 21: Overall View Of The Nrgt 26-2S

    LEDs and rotary knob, see page 45 Cover screws M4 x 16 mm M12 connector, 5-pole, A-coded Sheath (simplified view) Flange DN 50, PN 40, DIN 1092-01 Protective tube Electrode Spacer disc Fig. 6 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 22: Dimensions Of The Nrgt 26-2

    238 °C Ø 15 1004 1110 1000 1214 1100 1319 1200 1423 1300 1528 1400 1636 1500 Fig. 7 All lengths and diameters 2156 2000 in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 23: Dimensions Of The Nrgt 26-2S

    Ø 48.5 range at 238 °C 1053 1157 1075 Ø 42.5 1262 1175 1366 1275 1471 1375 1579 1475 Fig. 8 All lengths and diameters 2099 1975 in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 24: Preparing For Installation

    M16 screws and a gasket. You will need a size 24 torque wrench. Select screws and a gasket that are suitable for the flange’s pressure rating. ■ NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 25: Installation

    For oblique installation of the NRGT 26-2 ■ The level electrode must not be inclined more than 45° maximum, and the electrode rod is limited to 688 mm maximum, see Fig. 16. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 26: 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 paste ■ Fig. 10 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 27: 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 28: 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 29: Installing Two Level Electrodes In A Flange By Detaching A Terminal Box

    900 mm from the start of the protective tube. With a protective tube length of ≥ 1500 mm, always attach a ring-shaped mounting bracket 100 mm from the end of the protective tube. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 30: 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 35 G ¾ DN 50 ≥ 14 ≤ 90° Ø 20 Fig. 12 All lengths and diameters in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 31 Protective tube (provided on site) for internal installation. Illustration not to scale. Key, see page 35 G ¾ DN 50 ≥ 14 ≤ 90° Ø 20 Fig. 13 All lengths and diameters in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 32 Illustration not to scale. Key, see page 35 G ¾ G ¾ DN 100 24.5-26.0 24.5-26.0 ≥ 14 " ≤ 90° Ø 20 Fig. 14 All lengths and diameters in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 33 Illustration not to scale. Key, see page 35 G ¾ ≥ DN 20 ≥ 14 § ≥ DN 20 ≥ DN 20 Fig. 15 All lengths and diameters in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 34 688 mm maximum (equivalent to measuring range H=600mm). Illustration not to scale. Tube e.g. 33.7 x 3.2 Fig. 16 All lengths and diameters in mm NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 35: Positioning The Terminal Box

    Never rotate the terminal box more than 180 degrees in either direction. ■ If the terminal box needs to be rotated by >180° or fully removed, proceed as described on pages 27 to 29. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 36: Functional Elements Of The Nrgt 26-2 / Nrgt 26-2S

    Terminal box 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 45 M12 connector, 5-pole, A-coded NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 37: Electrical Connection

    ■ Connecting the 24 V DC power supply The NRGT 26-2 or NRGT 26-2s level transmitter is supplied with 24 V DC. ■ A safety power supply unit that delivers a Safety Extra Low Voltage (SELV) and is isolated from con- ■...

  • Page 38: Bringing Into Service

    Parameters are also password-protected when the equipment has been restarted, if password protection was previously enabled, see page 43. 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 39 The display then alternates between the selected parameter and its current value. Press and hold the rotary knob until the current parameter value flashes on the display. Move on to step 8. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 40 CAL.H = calibrate end of measuring range 100% ■ Filt = filter constant ■ diSP = initiate a display test ■ InFo = show software version and equipment type ■ = enable/disable password protection ■ NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 41: Calibrate 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 the rotary knob for approx. 1 second. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 42: Calibrate 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 43: 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 44: Checking The Level Display By Raising Or Reducing The Level

    Never start up any plant that has not passed the above tests. ■ NRGT 26-2 and NRGT 26-2s level transmitters may only be repaired by the manufacturer, ■ GESTRA AG. Replace faulty equipment only with identical equipment from GESTRA AG.

  • Page 45: Starting, Operation And Testing

    Priority of error code display Higher priority error codes overwrite lower ones on the display! See page 49 ff. for fault indications and the error code table. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 46 In the event of a fault or error state, an analogue value of 0 mA is output. ■ 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 47 If the level transmitter does not behave as described above, the equipment may be faulty. ■ Perform failure analysis. ■ NRGT 26-2 and NRGT 26-2s level transmitters may only be repaired by the manufacturer, ■ GESTRA AG. Only replace faulty equipment with identical equipment from GESTRA AG.

  • Page 48: 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 49: Indication Of System Malfunctions Using Error Codes

    PWMTSTCh1Err 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, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 50 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 messages. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 51: Common Application And Usage Errors

    ■ The measuring range is incorrectly set. ■ Inspect the electrode and protective tube for soiling and ■ The electrode or protective tube is soiled. ■ clean if necessary. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 52 Reduce the ambient temperature around the terminal ■ If the temperature rises above 75 °C, the error code box, e.g. by cooling. E.027 (Overtemp Err) appears and the 0 mA current output causes a fault shutdown. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 53: Checking Installation And Function

    Always perform this check with the plant at its operating 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 26-2 or NRGT 26-2s ■ level transmitter is replaced.

  • Page 54: 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 27 to 29. NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...

  • Page 55: 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 56: 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 57 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 58 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 59 NRGT 26-2, NRGT 26-2s - Installation & Operating Manual - 819876-02...
  • Page 60 Germany Tel. +49 421 35030 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 819876-02/09-2022cm (808952-02) · GESTRA AG · Bremen · Printed in Germany...

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Nrgt 26-2s

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