Mechanical pressure switches 49 Tested to PE Directive 97/23/EC DWAM, DWAMV, SDBAM Pressure monitors / pressure limiters These series are particularly suitable for It can be used as a pressure monitor or maximum pressure monitoring in steam and a pressure limiter for maximum pressure hot-water systems. The pressure switch is monitoring (systems in accordance with of special constructio, with a self-monitoring TRD 604 DIN EN12828) systems in pressure sensor, built in accordance with accordance with DIN EN12952-11 and Pressure Equipment Directive PED 97/23/EC. DIN EN12953-9 and is available with or without adjustment. SIL 2 according IEC 61508-2 DWAM1 Technical data Steam Systems according to TRD 604 Component tested for Hot water Systems according to DIN EN12828 Pressure connection VdTV MemorandumPressure 100 External thread G 1/2 (pressure gauge Testing basis connection) to DIN 16 288 and internal thread G 1/4 to ISO 228 Part 1. Pressure monitor / Pressure limiter Function Switching device Rugged housing (200) made of seawater- For maximum pressure monitoring only Directing of action resistant diecast aluminium.Of special constructio (self-monitoring sensor with Materials Sensor safety diaphragm) Pressure bellows: Material no. 1.4571 Sensor housing: Material no. 1.4104 Switch housing: GD AI Si 12 according to DIN 1725 Product Summary Maximum pressure monitoring ( ) (for other pressure ranges see DWR series) Mounting position Type Setting range Switching Max. Dimen- Vertically upright and horizontal. differential permissible sioned Ambient temperature at switching device (mean values) pressure drawing 20 to +70C. Pressure monitors without differential adjustment Medium temperature 20 to +70C. for max. pressure monitoring page 21 + 22 The maximum medium temperature at the DWAM06 0.10.6 bar 0.04 bar 5 bar pressure sensor must not exceed the permitted ambient temperature at the switching device. DWAM1 0.21.6 bar 0.05 bar 5 bar 1 + 15 Temperatures may reach 85C for short DWAM6 1.26 bar 0.2 bar 10 bar periods. Higher medium temperatures are DWAM625 1.26 bar 0.25 bar 20 bar possible provided the upper limit at the switching device is ensured by suitable DWAM16 316 bar 0.4 bar 20 bar 1 + 19 measures (e.g. siphon). DWAM32 632 bar 1.2 bar 45 bar Mounting Directly on the pressure line (pressure gauge Pressure monitors with differential adjustment for max. pressure monitoring connection) or on a flat surface with two DWAMV1 0.21.6 bar 0.120.6 bar 5 bar 4 mm screws. 1 + 15 DWAMV6 1.26 bar 0.41.5 bar 10 bar Calibration for maximum pressure switch DWAMV16 316 bar 0,82,5 bar 20 bar The pressure monitors and safety pressure 1 + 19 limiting devices are calibrated so that, under DWAMV32 632 bar 2.56.0 bar 45 bar rising pressure, switching takes place at the defined switching pressure. The reset point under falling pressure is lower by the amount of Pressure limiters for maximum pressure monitoring (with internal interlock) the switching differential, or, in the case of Pressure change pressure limiting devices, by the fall in pressure for unlocking specified in the table. The scale value corresponds to the upper switching point. SDBAM1 0.21.6 bar 0.12 bar 5 bar SDBAM2,5 0.42.5 bar 0.15 bar 5 bar 1 + 15 Switching differential See Product Summary. SDBAM6 1.26 bar 0.4 bar 10 bar SDBAM625 1.26 bar 0.6 bar 20 bar Contact arrangement Single-pole changeover switch. SDBAM16 316 bar 0.8 bar 20 bar 1 + 19 Switching 250 VAC 250 VDC 24 VDC SDBAM32 632 bar 3.0 bar 45 bar capacity (ohm) (ind) (ohm) (ohm) Normal 8 A 5 A 0.3 A 8 A * If a downstream external interlock is added, DWAM... pressure monitors can also be used as pressure limiters (see page 51). Sealing P2 Generally available for SDBAM limiters. Sealing device P2 is included for SDBAM limiters and can also be retrofitted to pressure monitors on request. See sealing P2. Bursting pressure For all types 100 bar. DWAM... also available in Ex-i equipment. See DBS series. Verified by TV test. Minimum pressure controls Minimum pressure monitor: DWR page 50 Minimum pressure limiter: DWR-206 page 56 Protection Class: s IP 54 tested Accessories Solenoid valves Flow monitors Temperature sensors Thermostats Pressure transmitters Pressure switchesMechanical pressure switches 50 Tested to PE Directive 97/23/EC DBS Pressure monitors / pressure limiters In many aspects, safety-engineered pressure monitoring lines for short-circuit and line limiters offer a higher degree of safety compared break and therefore offers an additional safety with normal pressure switches and are therefore advantage even in non-Ex-zones. For especially suitable for chemical process Ex-applications, the isolating amplifier must be engineering and thermal installations in which installed outside the Ex-zone. The lines between safety is an especially critical factor in pressure the isolating amplifier and the pressure switch monitoring. Pressure switches can also be used are monitored for short-circuit and line break. in Ex- zones (zone 0, 1, 2 and 20, 21, 22) and, in all cases, require an isolating amplifier. SIL 2 according IEC 61508-2 DWAM6-576 The isolating amplifier is also responsible for Technical data Safety requirements for pressure limiters Pressure limitersof special constructio (DBS) must fulfil additional safety requirements, i.e. breakage Greater safety or leakage in the mechanical part of the sensor must lead to shutdown to the safe side. The pressure in process engineering and chemical installations, limiter must respond as if the system pressure had already exceeded the maximum limit. The control in gas and liquid gas installations circuit for the pressure limiter must also be considered from the point of view of safety, as short-circuits in the supply lines or other faults in the control current circuit can lead to dangerous conditions. Basic features: Of special constructio according to VdTV MemorandumPressure 100 Switching element with positive opening operation and gold-plated contacts Line break and short-circuit monitoring- between pressure switch and isolating The microswitch is equipped with positive opening operation. Rather than transmitting the plunger force amplifier via a spring, which is the usual method with most microswitches, this newly developed microswitch has Suitable for Ex areas (zone 0, 1 & 2 or 20, 21 an additional lever which transmits the movements of the pressure bellows positively to the contact lever. & 22) (explosion protection Ex-ia) Degree of protection IP 65 If the spring breaks, the contact lever is moved directly. Plastic-coated housing (chemical version) Line break and short-circuit monitoring in the control circuit Options: Limiter with internal interlock The resistor connected in series with the switching contact limits the current to a defined value with the switch closed. In the event of short-circuit in the area between the isolating amplifier and the series Type-specific features: Self-monitoring sensors resistor, the current rises above the predetermined limit value, the relay of the isolating amplifier drops Positive opening microswitches out, the output current circuit is interrupted and thus the safe condition is achieved. In the event of a line Gold-plated contacts break, the current flow is interrupted, the relay drops to the safe side and interrupts the output current TV, DVGW component tests circuit (safety sequence). Furthermore, the isolating amplifier is designed so that, if faults occur in the electronics (conductor interruption, component defect etc.) and in the resulting situations, the safe shutdown condition is assured. These characteristics of the safety-engineered isolating amplifier, including line break and short-circuit monitoring, satisfy the requirements of DIN/VDE 0660, Part 209. Connection diagram For pressure monitoring in Ex areas, the isolating amplifier must be installed outside the Ex-zone. The pressure limiter has an intrinsically safe control current circuit (Ex-ia). This arrangement is suitable for zones 0, 1 and 2, 20, 21 and 22.