Related Manuals for GESTRA NRGT 26-2n
Summary of Contents for GESTRA NRGT 26-2n
- Page 1 Level Transmitter NRGT 26-2n Original Installation & Operating Manual 850879-00 E n g l i s h...
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Page 2: Table Of Contents
Installing two level electrodes in a flange by detaching a terminal box ............. 25 Installing two level electrodes in a flange by detaching a terminal box ............. 26 Installation examples with dimensions for the NRGT 26-2n ..............27 Aligning the terminal box ..........................32 Functional elements of the NRGT 26-2n ...................... - Page 3 Taking out of service ............................ 49 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 26-2n - Installation & Operating Manual - 850879-00...
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Page 4: Content Of This Manual
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-SH ■ NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 5: How To Use This Manual
How to use this Manual This Installation & Operating Manual describes the correct use of the NRGT 26-2n level transmitter. It applies to persons who integrate this equipment in 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
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. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 7: Specialist Terms / Abbreviations
A boiler that is operated at 10 bar and 180 °C may be designed for a pressure of 60 bar and a tempera- ture of 275 °C, for example, which is not necessarily its operating point. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 8: Usage For The Intended Purpose
Usage for the intended purpose Use as a water level controller The NRGT 26-2n level transmitter 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% makes up the linear profile of the 4-20 mA current output. -
Page 9: Improper Use
Do not use the equipment in potentially explosive atmospheres. Do not bring any equipment into service that does not have its own specific name plate. The name plate indicates the technical features of the equipment. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 10: Basic Safety Information
Check 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. -
Page 11: Required Personnel Qualifications
Check level electrode function at least once a year by bringing the system to the minimum and/or maxi- mum water level (T1 = 1 year). The test function is initiated on site using the integrated rotary knob on the terminal box, see page 42. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 12: Function
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 electrode can be installed in the same protective tube or level pot. - Page 13 Electrode faults cannot be acknowledged. When the fault is corrected, the message disappears from the display, and the NRGT 26-2n 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.
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Page 14: Technical Data
Max. electrode length: 1004 Measuring range: Max. electrode length: 1110 1214 1319 1423 1528 1636 2156 Measuring range: 1000 1100 1200 1300 1400 1500 2000 Do not shorten the electrode rod. NRGT 26-2n - Installation & Operating Manual - 850879-00... - Page 15 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 26-2n - Installation & Operating Manual - 850879-00...
- Page 16 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. NRGT 26-2n - Installation & Operating Manual - 850879-00...
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Page 17: Example Name Plate/Identification Of The Nrgt 26-2N
Supply voltage Actual value output Current approval, conformity mark Disposal information Manufacturer Protection class Serial number Fig. 2 The date of production is stamped on the screw-in body of the level transmitter. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 18: Factory Settings
Factory settings The NRGT 26-2n level transmitter has the following factory 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. 2.0 V FiLt... -
Page 19: Overall View Of The Nrgt 26-2N
M12 connector, 5-pole, A-coded 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 26-2n - Installation & Operating Manual - 850879-00... -
Page 20: Dimensions Of The Nrgt 26-2N
238 °C Ø 15 1004 1110 1000 1214 1100 1319 1200 1423 1300 1528 1400 1636 1500 Fig. 5 All lengths and diameters 2156 2000 in mm NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 21: Preparing For Installation
Take further measures to protect the equipment from lightning, insects and animals, ■ and salty air. You will need the following tools: NRGT 26-2n Torque wrench (with size 41 open-ended spanner attachment), see page 20. ■ NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 22: Installation
For oblique installation of the NRGT 26-2n ■ The level electrode must not be inclined more than 45° maximum, and the electrode rod is limited to 688 mm maximum, see Fig.15. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 23: Installing The Nrgt 26-2N
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 tape ■ Conductive pastes ■ Fig. 7 NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 24: Installing Two Level Electrodes In A Flange
If necessary, apply a small quantity of silicone grease (e.g. Molykote® III) to the electrode thread H. Screw the NRGT 26-2n level electrode into the tank standpipe or flange cover, and tighten securely using a torque wrench (with size 41 open-ended spanner attachment). -
Page 25: Installation
Install the second electrode in the flange. Next, route all connecting cables through the hole in the terminal box and the fixing nut once again. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 26: Installing Two Level Electrodes In A Flange By Detaching A Terminal Box
If necessary, join the connecting cables in the terminal box together using cable ties. Finally, check the wiring one more time. Close the rear panel of the second electrode terminal box and screw back on. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 27: Installation 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 G ¾ DN 50 ≥ 14 ≤ 90° Ø 20 Fig. 9 All lengths and diameters in mm NRGT 26-2n - Installation & Operating Manual - 850879-00... - Page 28 Protective tube (provided at the site) for internal installation. Illustration not to scale. See the key on page 32 G ¾ DN 50 ≥ 14 ≤ 90° Ø 20 All lengths and diameters in mm Fig. 10 NRGT 26-2n - Installation & Operating Manual - 850879-00...
- Page 29 Illustration not to scale. See the key on page 32 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 26-2n - Installation & Operating Manual - 850879-00...
- Page 30 Illustration not to scale. See the key on page 32 G ¾ ≥ DN 20 ≥ 14 § ≥ DN 20 ≥ DN 20 Fig. 12 All lengths and diameters in mm NRGT 26-2n - Installation & Operating Manual - 850879-00...
- Page 31 688 mm maximum (equivalent to measuring range H=600mm). Illustration not to scale. Tube e.g. 33.7 x 3.2 Fig. 13 All lengths and diameters in mm NRGT 26-2n - Installation & Operating Manual - 850879-00...
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Page 32: Aligning The Terminal Box
Standpipe for connecting flange (perform preliminary inspection of standpipe during boiler inspection) Pressure relief hole Ø 20 mm Highest possible HW mark Electrode rod (NRGT 26-2n maximum measuring range 2000 mm) Protective tube DN 80 (≥ DN 100 in France as per AFAQ) Protective tube DN 100 Distance between electrode rod and protective tube ≥... -
Page 33: Functional Elements Of The Nrgt 26-2N
Fig. 14 Terminal box Example Cover screws M4 x 16 mm NRGT 26-2n Operating panel with 4-digit LED display/malfunction and status LEDs and rotary knob, see page 40 M12 connector, 5-pole, A-coded NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 34: Electrical Connection
Pre-wired control cables (with plug and coupling) are available as accessories in various lengths. ■ Connecting the 24 V DC power supply The NRGT 26-2n 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 35: Bringing Into Service
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. NRGT 26-2n - Installation & Operating Manual - 850879-00... - Page 36 Save your settings by pressing the rotary knob for approx. 1 second. The message “donE” is shown and the parameter appears on the display once more. NRGT 26-2n - Installation & Operating Manual - 850879-00...
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Page 37: Calibration To The Lower Limit Of The Active Measuring Range "Cal.l" (0% Calibration Value)
Press and hold the rotary knob until the new value is displayed. Save your setting by pressing the rotary knob for approx. 1 second. Continue with calibration “CAL.P” or “CAL.H”. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 38: Perform Independent Rapid Calibration At A Water Level Of > 25% Of The Active Measuring Range "Cal.p
Press and hold the rotary knob until the current time constant flashes on the display. Set the desired time constant (1 to 30 seconds). Save your setting by pressing the rotary knob for approx. 1 second. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 39: Manually Initiating A Display Test
Never start up any system that has not passed the above tests. ■ The NRGT 26-2n level transmitter 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 ones on the display! See page 44 ff. for fault indica- tions and the error code table. NRGT 26-2n - Installation & Operating Manual - 850879-00... - 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 26-2n - Installation & Operating Manual - 850879-00...
- Page 42 If the level transmitter does not behave as described above, the equipment may be faulty. ■ Perform failure analysis. ■ The NRGT 26-2n level transmitter may only be repaired by the manufacturer, GESTRA AG. ■ Only replace faulty equipment with identical equipment from GESTRA AG. ■...
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Page 43: System Malfunctions
Switch off the voltage to the system and secure so that it cannot be switched back on. ■ Check that the system is not carrying live voltage before commencing work. ■ NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 44: Indication Of System Malfunctions Using Error Codes
Channel 1 reading with disabled E.010 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 26-2n - Installation & Operating Manual - 850879-00... - Page 45 Virtually all of the aforementioned error codes can be caused by EMC interference. This is less likely to be the case for permanent errors, but should be considered for sporadic error messages. NRGT 26-2n - Installation & Operating Manual - 850879-00...
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Page 46: Common Application And Usage Errors
■ The measuring range is incorrectly set. ■ Inspect the electrode and protective tube for soiling and ■ There is soiling of the electrode or protective tube. ■ clean if necessary. NRGT 26-2n - Installation & Operating Manual - 850879-00... - Page 47 Remedy Clean the sealing surfaces. ■ The earth connection to the tank is interrupted. 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...
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Page 48: Checking Installation And Function
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. -
Page 49: Taking Out Of Service
Proceed as follows: Reduce the boiler pressure to 0 bar. Allow the level electrode to cool to room temperature. Switch off the supply voltage. Detach the plug-in connection. Next, remove the level electrode. NRGT 26-2n - Installation & Operating Manual - 850879-00... -
Page 50: Cleaning The Measuring Electrode Of The Level Transmitter
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. -
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 the relevant certificates. You can download the latest 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... - Page 52 GESTRA UK Ltd Germany Tel. +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 850879-00/05-2022cm (809182-00) · GESTRA AG · Bremen · Printed in Germany...
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