RDN4 - RDN8 Differential pressure switch Main Features Excellent repeatability Dead band adjustment for regulation Fix dead band for control and alarm Applications Power generation safety equipment Pressurized chambers control Liquid level control Technical Data Pressure range -2.5 ... 2.5 mbar to 2.5 ... 30 bar Scale Internal. Accuracy on reading ± 5% F.S. Temperature Pressure range codes 110 to 157 Medium: -15 ... +150 °C Ambient: -25 ... + 55 °C Storage: -40 ... + 70 °C Cover Case Zamak blue painted Captive stainless steel screws Black Zamak Mounting Wall mounting braket Ground connection Via internal terminal block Electrical connection Electrical function Terminal block with plastic cable gland : - cable Ø 7 to 10.5 mm Adjustment 2 external adjustment screws for set point and dead band. When set point adjustment is required it is necessary to know the static pressure, as it has an influence on the set point. Pressure range codes 211 to 258 Medium: -50 ... +200 °C Ambient: -25 ... + 55 °C Storage: -40 ... + 70 °C Repeatability ± 1% F.S. / constant pressure cycle CE conformity Low Voltage Directive LVD 2006/95/EC Protection rating IP 66 (EN 60529) Process Connection Stainless steel 1.4404 (316L) Sensing element Pressure range codes 110 to 157 Flanges:Stainless steel 1.4404 (316L) Diaphragm:Viton® See ordering code details in page 5 Pressure range codes 211 to 256 Bellow:Stainless steel 1.4404 or 1.4432 (316L) Design and specifications subject to change without notice Pressure range codes 257 and 258 Piston:Nickel plated steel Options Customer specific set point adjustment Code SETP Oxygen application Code 0765 Mounting on 2" pipe Code 0407 Stainless steel tag plate and wire Code 9941 Lead seal of the adjustment screws Code 8990 Mobile plug for stainless steel connector (Souriau) Code 2249 2015-11-12 Electrical connection: stainless steel connector (Souriau) Code 2298 www.baumer.com Data sheet A32.20 Page 1 / 5 RDN4 - RDN8 Differential pressure switch Principle ∆P A flexible sensing element actuates a microswitch by means of a piston. The set point is adjusted by means of a compressible spring installed in opposition. NC NC NC C C C NO NO NO HP < LP HP > LP Set point and reset point must be between 10% and 90% of the selected scale. Standard factory adjustment Setpoint at 50% of the scale on falling pressure NC C NC NC C C NO NO NO Customer speciffic factory adjustment (option SETP) The following specifications have to be given with the order: • Setpoint value • Adjustment on falling or raising pressure. • Static pressure • Dead band value (as needed) when using an adjustable dead band switch Electrical connections 2 SPDT 1 SPDT NC Blue COM Red NO White NC Blue COM Red NO Yellow / green NC COM NO White Blue Red White 2015-11-12 Design and specifications subject to change without notice Yellow / green www.baumer.com Data sheet A32.20 Page 2 / 5 RDN4 - RDN8 Differential pressure switch Micro switches characteristics Switch code Type 6 Vdc A (B) M (K) C (W) E (F) H D (V) J Standard Gold contact Hermetic Ultra sensitive Manual reset Ultra sensitive Hermetic Manual reset 10... 50 mA 5 mA ... 4 A 0.4... 10 A 0.4... 1A N/A 0.4... N/A 12 Vdc 0.4... 10 A 10... 50 mA 5 mA ... 4 A 0.4... 1A 0.4... 4A 24 Vdc 0.4... 6A 10... 50 mA 5 mA ... 4 A 0.4... 1A 0.1... 8A 0.4... 4A 0.1... 8A 30 Vdc 0.4... 6A 10... 10 mA 5 mA ... 3 A 0.4... 1A 0.1... 8A 0.4... 2A 0.1... 8A 48 Vdc 0.4... 6A 10... 50 mA 5 mA ... 3 A N/A 0.1... 8A 0.1... 8A 110 Vdc 0.1... 0.5 A 10... 50 mA 5 mA ... 1 A N/A 220 Vdc 0.1... 0.25 A 10... 50 mA 5 mA ... 0.5 A 115 Vac 0.4... 10 A 10... 50 mA 50 mA ... 3 A 250 Vac 0.2... 10 A 10... 50 mA 2000 V Dielectric rigidity between contacts and ground 2000 V N/A 4A N/A N/A N/A 0.4... N/A N/A N/A N/A N/A N/A 10 A 0.1... 10 A N/A 0.1... 10 A 50 mA ... 2.5 A 0.2 ... 10 A 0.1... 5A N/A 0.1... 5A 1500 V 2000 V 2000 V 1000 V 2000 V Adjustable ranges Scale mbar mbar Max P Static Micro-switch dead band (1) Adjustable dead band Code A (B*) 10% bar M (K*) Fixed dead band C(W*) 90% 10% E(F*) 90% 10% H D (V*) J 90% 10% 90% mbar -2.5... 2.5 5 0.15 110 N/A N/A N/A N/A 0.3 0.4 N/A N/A 2 ... 10 10 0.15 111 1.2 - 10 1.6 - 10 4.5 - 10 4.5 - 10 0.3 0.4 1.5 2 2 ... 50 50 0.15 121 1.7 - 30 2.2 - 30 5 - 30 5.5 - 30 0.4 0.5 2 3 2 ... 100 100 0.15 131 1.7 - 40 2.5 - 40 5.5 - 40 10 - 40 0.5 0.7 2 3 10 ... 200 200 1 156 8 - 80 10.5 - 80 25 - 80 40 - 80 2.5 3.4 10 13 400 1 157 15 - 150 20 - 150 30 - 150 45 - 150 4.5 6 18 10 ... 400 Code bar 0.05... 0.5 0.5 7 211 mbar bar 0.09 - 0.3 0.1 - 0.3 0.15 - 0.4 0.2 - 0.4 25 24 bar 30 0.11 0.12 0.05... 1 1 7 221 0.09 - 0.3 0.1 - 0.3 0.15 - 0.4 0.22 - 0.4 25 30 0.11 0.12 0.15... 0.5 0.5 30 214 0.14 - 0.5 0.18 - 0.5 N/A N/A 55 60 0.17 0.22 0.24 0.15... 1 1 30 224 0.2 - 0.6 0.25 - 0.6 N/A N/A 55 60 0.17 0.15... 4 4 30 234 0.21 - 1.5 0.27 - 1.5 0.65 - 2 0.8 - 2 55 65 0.17 0.3 0.8... 4 30 235 0.7 - 2.5 1.1 - 2.5 0.75 - 2.5 1.1 - 2.5 70 100 0.84 1.35 1.35 4 0.8... 10 10 30 245 0.7 - 2.5 1.1 - 2.5 0.75 - 2.5 1.1 - 2.5 70 100 0.84 1.5... 10 10 65 246 1.2 - 5 2.5 - 5 2.5 - 6 3.5 - 6 180 240 1.45 3 1.5... 20 20 65 256 1.2 - 5 2.5 - 5 2.5 - 6 3.5 - 6 180 240 1.45 3 2.5... 20 20 220 257 2.5 - 20 3.5 - 20 6 - 20 7 - 20 800 1000 3 4.2 2.5... 30 30 220 258 3 - 30 4 - 20 6 - 20 7 - 20 850 1000 3.5 4.8 (*) For version with 2 microswitches lower values of the dead band must be multiplied x 1.5 The value of the dead band is depending on the value of the set point. This table contains the dead band values for set point adjustment at 10% and 90% of the selected scale. For adjustable dead band the lower value corresponds to the dead band spring totally released and the higher corresponds to the dead band spring fully tensed. For other set points the dead band value can be calculated by linear interpolation between the values at 10% and 90%. 2015-11-12 (1) Design and specifications subject to change without notice Max ΔP www.baumer.com Data sheet A32.20 Page 3 / 5 RDN4 - RDN8 Differential pressure switch Dimensions (mm) 125 76.5 = 144 139 = 58 130 5 64 100 45° Pressure range codes: 110 - 111 - 121 - 131 Weight: 3 kg Pressure range codes: 156 - 157 Weight: 2.8 kg 76.5 76.5 28.5 28.5 LP 78 80 LP Hex 24 HP 70 HP 46.5 G 1/2(M) Ø 220 G 1/2(M) Ø 146 Pressure range codes: 211 - 221 Weight: 3 kg 130 76.5 76.5 144 144 130 Pressure range codes: 214 - 224 - 234 - 235 - 245 - 246 - 256 - 257 - 258 Weight: 3 kg 28.5 124 28.5 60 124 LP 136 89 HP 60 HP LP 70 Ø 65 27 70 G 1/2(M) 2015-11-12 G 1/2(M) Design and specifications subject to change without notice Hex 24 www.baumer.com Data sheet A32.20 Page 4 / 5 RDN4 - RDN8 Differential pressure switch Ordering details RDN4 - RDN8 RD N Model Differential pressure switch Approvals Standard version without ATEX approval . – xxx / RD N Sensing element Diaphragm (Viton®, range 110 to 157) Bellow (stainless steel, range 211 to 256) or Piston (nickel plated steel, range 257 and 258) Type of micro switches Deadband 1 SPDT standard changeover switch Adjustable 2 SPDT standard changeover switch Adjustable 1 SPDT hermetically changeover switch Adjustable 2 SPDT hermetically changeover switch Adjustable 1 SPDT ultra sensitive changeover switch Fix 2 SPDT ultra sensitive changeover switch Fix 1 SPDT hermetically, ultra sensitive changeover switch Fix 2 SPDT hermetically, ultra sensitive changeover switch Fix 1 SPDT gold contact changeover switch Adjustable 2 SPDT gold contact changeover switch Adjustable 1 SPDT changeover switch, manual reset, opening on raising pressure Fix 1 SPDT changeover switch, manual reset, opening on falling pressure Fix Pneumatic changeover contact, NO Pneumatic changeover contact, NC Process connection G 1/2 male (standard) 1/2 NPT male 1/4 NPT female – 4 8 A B C W E F D V M K H J Z Y 3 6 8 . Pressure range (mbar) Pressure range (kPa) -2.5 ... 2.5 -0.25 ... 0.25 2 ... 10 0.2 ... 1 2 ... 50 0.2 ... 5 2 ... 100 0.2 ... 10 10 ... 200 1 ... 20 10 ... 400 1 ... 40 Pressure range (bar) Pressure range (kPa) 0.05 ... 0.5 5 ... 50 0.05 ... 1 5 ... 100 0.15 ... 0.5 15 ... 50 0.15 ... 1 15 ... 100 0.15 ... 4 15 ... 400 0.8 ... 4 80 ... 400 0.8 ... 10 80 ... 1000 1.5 ... 10 150 ... 1000 1.5 ... 20 150 ... 2000 2.5 ... 20 250 ... 2000 2.5 ... 30 250 ... 3000 Options to be added behind the / (see example below) 110 111 121 131 156 157 / Ordering example with options RD N – 4 C 3 . 111 / 0407 _ 9941 Differential pressure switch With ATEX approval Diaphragm Viton® 1 SPDT hermetically changeover switch Process connection G 1/2 male Pressure range 2 ... 10 mbar (0.2 ... 1 kPa) Option: Mounting on 2" pipe 2015-11-12 Option: Stainless steel tag plate and wire Design and specifications subject to change without notice 211 221 214 224 234 235 245 246 256 257 258 www.baumer.com Data sheet A32.20 Page 5 / 5