Gestra Products Technical - Control And Power

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Self-Monitoring Low/High-Level Alarms – Conventional Design – Description Low-level limiter NRG 16-11 / NRS 1-7 b Application and Purpose Use self-monitoring low-water limiter with periodic self-checking type NRG 16-11 in combination with level switch NRS 1-7 in steam boilers and hot-water plants. The equipment meets the German regulations for use in steam boiler plants operating without constant supervision (TRD 604 sheet 1 and 2). For boiler operation acc. to TRD 604 two selfmonitoring low-level limiters are required and for boiler operation to TRD 602 only one selfmonitoring low-level limiter is necessary. The level electrode NRG 16-11 can be combined with the following GESTRA systems: High-Level Alarms Description “Conventional Design” NRG 16-4 / NRS 1-2 Application and Purpose Use in combination with level switch NRS 1-2 for water-level limiting (low-level alarm), on-off liquid control and signalling of levels of conductive liquids. The stainless steel design is particularly suited for aggressive fluids. For vessels and steam boilers up to PN 40 with level switch in accordance with TRD 604 (boiler operation without constant supervision). Sensing unit for high-level alarm and level control. Design The level electrode NRG 16-4 is available with screwed connection 3/8" BSP Material: X6CrNiMoTi17-12-2 (DIN no. 1.4571) <strong>Technical</strong> Data Type Pressure rating End connection 94 n NRG 26/NRR 2-2 (modulating level control) n NRG 26/NRR 2-1 (modulating level control) n NRG 26/NRS 2-1 (on-off level control) n ER 56/NRS 1-5 (on-off level control) n NRG 16-4/NRS 1-2 (high-level alarm) n NRG 16-12/NRS 1-8 (self-monitoring high-level alarm) The level electrode NRG 17-11 can be combined with the following GESTRA systems: n NRG 17-12/NRS 1-8 (high-level alarm) The level electrode NRG 19-11 can be combined with the following GESTRA systems: n NRG 19-12/NRS 1-8 (high-level alarm) The installation of two low-level alarms in one standpipe is not permissible according to TRD. The electrodes are supplied in different lengths (see data sheet). For switching levels between these dimensions the electrode tip can be cut to length as required. Wiring to the electrode is effected by a four-pole connector. “Self-Monitoring” NRG 16-12 / NRS 1-8 Application and Purpose Use in combination with level switch NRS 1-8 as self-monitoring high-level alarm with periodic self-checking according to TRD 604 sheet 1 and 2 for high-water level detection (high-level alarm) in steam and pressurized hot-water boilers. Design The high-level limiting system comprises level electrode NRG 16-12, NRG 17-12 or NRG 19-12 and level switch NRS 1-8. Service pressure [bar] / Saturated steam temperature Low-level limiter and controller NRG 16-36 / NRS 1-9 Application and Purpose Level controller and self-monitoring lowwater level limiter with periodic self-checking feature to be used in conjunction with level electrode NRG 16-36 for on-off boiler feedwater control, high level detection (alarm) and low-water level limiting (min. level alarm). Application in steam and pressurized hotwater boiler installations in accordance with TRD 602 and TRD 604, sheet 1 and 2. Switching <strong>Control</strong>ler NRS 1-9 b Plug-in unit in plastic case for installation in control cabinets. The terminals are accessible after unplugging the unit from its base. The plug-in unit may be snapped onto a 35 mm supporting rail or screwed into position on a mounting panel. Field enclosures for several plug-in units are available on request. The level electrodes NRG 16-12, NRG 17-12 and NRG 19-12 consist of a measuring electrode fitted in a body. The electrode is insulated by special insulating seals. The pressure-tight connection of the electrode is effected coaxially with a contact ring and a stud. A system of compression springs in the electrode body ensures sufficient sealing forces at the insulating seals, even if temperatures vary. The stud is insulated by a PTFE foil. Contact ring and body are connected to the four-pole connector base by PTFE insulated wires. The level electrode is available in various lengths up to 1500 mm. Observe mounting instructions (see examples of installation). The system (electrode + level switch) complies with the regulations concerning protection circuits for firing equipment of furnaces in accordance with DIN 57116 / VDE 0116. Lengths supplied [mm] Ambient temperature [°C] NRG 16-11 PN 40 ¾" 32 / 238 500 – 3000 70 NRG 16-36 PN 40 1½" 32 / 238 1000 – 1500 70 NRG 17-11 PN 63 ¾" 60 / 275 500 – 3000 70 NRG 19-11 PN 160 ¾" 100 / 311 500 – 3000 70 NRG 111-11 PN 320 1" 180 / 357 500 – 3000 70 NRG 16-4 PN 40 ³∕8" 32 / 238 500 – 1500 70 NRG 16-12 PN 40 ¾" 32 / 238 500 – 1500 70 NRG 17-12 PN 63 ¾" 46 / 260 500 – 1500 70 NRG 19-12 PN 160 ¾" 100 / 311 500 – 1500 70
Self-Monitoring Low/High-Level Alarms – Conventional Design – Self-monitoring low-level limiter Level electrode NRG 16-11 ¾" BSP DN 50 mm Connecting flange Low level Low-level limiter, on-off control and high-level alarm Combination electrode NRG 16-36 1½" BSP DN 50 mm Connecting flange High-Level Alarms – Conventional Design High-level alarm (conventional design) Level electrode NRG 16-4 3/8" BSP DN 50 mm Connecting flange High level Level control Low level High level Self-monitoring high-level alarm Level electrode NRG 16-12 3/4" BSP DN 50 mm Connecting flange High level Level switch NRS 1-9 Level switch NRS 1-7 Level switch NRS 1-2 Level switch NRS 1-8 Burner protection circuit High-level alarm (pump OFF) Burner protection circuit Pump OFF Pump OFF 0525 0525 Type PN Stock code NRG 16-11, NRS 1-7 NRG 17-11, NRS 1-7 NRG 19-11, NRS 1-7 NRG 111-11, NRS 1-7 Type approval TÜV WB 05-354 EG 01 202 931-B-01-0077 Type approval TÜV WB/WR 04-370 EG 01 202 931-B-01-0075 Optional voltages: NRS 1-7, NRS 1-9 Special voltage: 115 V, 24 V, 50..60 HZ Type approval TÜV WR 08-302 Type approval TÜV HWS 08-417 L = 1000 mm 230 V L = 1000 mm 230 V L = 1000 mm 230 V L = 1000 mm 230 V 40 63 160 320 Optional voltages: NRS 1-2, NRS 1-8 Special voltage: 115 V, 24 V, 50..60 HZ 3511042 3232541 3541042 3232541 3571042 3232541 3571142 3232541 Type PN Stock code NRG 16-36, NRS 1-9 L = 1000 mm 230 V For flanges see Price List 40 3581047 3232841 Type PN Stock code NRG 16-4, NRS 1-2 L = 1000 mm 230 V 40 3441241 3231441 Type PN Stock code NRG 16-12, NRS 1-8 NRG 17-12, NRS 1-8 NRG 19-12, NRS 1-8 L = 500 mm 230 V L = 500 mm 230 V L = 500 mm 230 V For flanges see Price List 40 63 160 3521041 3232741 3551041 3232741 3591041 3232741 95 B
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GESTRA Technical Information Steam
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GESTRA Steam Traps and Steam Trap M
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For steam and energy management, we
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Thermostatic Steam Traps BK with Du
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Thermostatic Steam Traps MK with Me
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Ball-Float Traps UNA PN 1 - PN 1 0
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Ball-Float Traps UNA PN 1 - PN Capa
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Thermodynamic Steam Traps DK PN 0,
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Steam Traps for Special Application
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Steam Traps for Special Application
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Steam Trap Units ECONOline for UNIV
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Testing Steam Traps Like any other
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Steam Trap Monitoring Equipment Sys
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Condensate Collector and Steam Mani
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GESTRA DISCO Non-Return Valves 30 G
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DISCO ® Non-Return Valves RK, PN 6
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Page 44 and 45: DISCOCHECK ® Dual-Plate Check Valv
Page 46 and 47: DISCOCHECK ® Dual-Plate Check Valv
Page 48 and 49: DISCO ® Swing Check Valves CB DN 5
Page 50 and 51: Swing Check Valves WB without sprin
Page 52 and 53: NAF-Check Valves DN 40 - 1000 mm, P
Page 54 and 55: GESTRA Control Valves ZK 54 GESTRA
Page 56 and 57: Cooling Water Control Valves CW GES
Page 58 and 59: Return-Temperature Control Valves B
Page 60 and 61: Return-Temperature Control Valves B
Page 62 and 63: Self-Acting Pressure Control Pressu
Page 64 and 65: Self-Acting Temperature Controllers
Page 66 and 67: Control Valves with Electric and Pn
Page 68 and 69: Control Valves ZK with Radial Stage
Page 70 and 71: Control Valves ZK with Radial Stage
Page 72 and 73: Strainers GSF H H 1 H H 1 72 B S
Page 74 and 75: Stop Valves GAV H 1 74 L1 Stop Valv
Page 76 and 77: SPECTOR Product Range GESTRA’s SP
Page 78 and 79: How to Read Type Codes GESTRA Type
Page 80 and 81: GESTRA Steam Plant D 80 T P S A J B
Page 82 and 83: Fundamental Principles of Measureme
Page 84 and 85: Type Approvals at a Glance GESTRA B
Page 86 and 87: Type Approval Nos. at a Glance Type
Page 88 and 89: Level Limitation Low-Level Limiter
Page 90 and 91: Description 1. Conductivity Measure
Page 92 and 93: SPECTORcompact Where formerly two d
Page 96 and 97: Modulating Level Control - Conventi
Page 98 and 99: Accessories for Liquid-Level Alarms
Page 100 and 101: Level Probes and Control Units for
Page 102 and 103: Marine Applications Level Electrode
Page 104 and 105: GESTRA Equipment for Energy Supply
Page 106 and 107: Temperature Control Bus NrS 1-40.1
Page 108 and 109: Temperature Control Conventional Tr
Page 110 and 111: Conductivity Monitoring Basic Princ
Page 112 and 113: Conductivity Spector Bus/Compact Lr
Page 114 and 115: Conductivity Monitoring with Manual
Page 116 and 117: Conductivity Monitoring with Manual
Page 118 and 119: Ancillaries: Level Pots and Portabl
Page 120 and 121: Continuous Blowdown Valves 120 L BA
Page 122 and 123: Programme-Controlled Blowdown Syste
Page 124 and 125: Rapid-Action Intermittent Blowdown
Page 126 and 127: Contamination Detectors for Condens
Page 128 and 129: Ingress of Oil in Cooling Water Sys
Page 130 and 131: Flowmeters for Steam, Gases and Liq
Page 132 and 133: GESTRA SPECTOR Family SpECTorcom/co
Page 134 and 135: Condensate Recovery and Return Syst
Page 136 and 137: Closed-Type Condensate Recovery and
Page 138 and 139: Steam Powered Condensate Return Tan
Page 140 and 141: Steam Regenerators Steam regenerato
Page 142 and 143: Flash Vessels Type VD Flash Vessels
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Condensate Dampening Pot ED Technic
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Controls Pump Controls Function The
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Questionnaire for preparing offers
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156 Our Mobile Testing Station For
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Technical Advice and Training Semin
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Useful Conversions MASS 1 kilogramm
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EC Pressure Equipment Directive (PE
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EC Pressure Equipment Directive (PE
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Combined Imperial and S. I. Steam T
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DIN Material Reference Chart 168 EN
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Technical Literature Technical Docu
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Index by Product Name Product Type
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Index by Product Name Product Type
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Index by Product Code Type Product
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Note: Responable care has been take
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Gestra Products Technical - Control And Power

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