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DWR Pressure monitors DWR625 tested DVGW TÜV Product Summary Steam Systems according to TRBS Hot water Systems according to DIN EN12828 Fuel gases DVGW work sheet G 260 Pressure tank DIN EN764-7 Pressure monitor or pressure limiter (with external interlock) For maximum and minimum pressure monitoring (DWFS, SDBFS) "of special construction" by testing with 2 million cycles. Component tested for Function Direction of action Sensor -DWR see page 66 Technical data Pressure connection External thread G 1/2 (pressure gauge connection) to DIN 16 288 and internal thread G 1/4 to ISO 228 Part 1 (for gas applications internal thread permissible only up to 4 bar). Switching device Rugged housing (200) made of seawater resistant die cast aluminium. Materials Pressure bellows: Material no. 1.4571 Sensor housing: Material no. 1.4104 Switch housing: GD AI Si 12 (DIN 1725) Mounting position Vertically upright and horizontal. Ambient temperature at switching device –25 to +70°C, Medium temperature –25 to +70°C. The maximum medium temperature at the pressure sensor must not exceed the permitted ambient temperature at the switching device. Temperatures may reach 85°C for short periods. Higher medium temperatures are possible provided the above limit values for the switching device are ensured by suitable measures (e.g. siphon). Mounting Directly on the pressure line (pressure gauge connection) or on a flat surface with two 4 mm Ø screws. Calibration The DWR series is calibrated for rising pressure. This means that the adjustable switching pressure on the scale corresponds to the switching point at rising pressure. The reset point is lower by the amount of the switching differential. (See also page 23, 2. Calibration at upper switching point). In version ...-203 the switching differential is adjustable. The basic calibration is maintained. Bursting pressure For all types ≥ 100 bar, verified by TÜV test. Switching differential For values see Product Summary. Contact arrangement Single pole change over switch. Protection class IP 54 according to DIN 40 050 Switching 250 VAC 250 VDC 24 VDC capacity (ohm) (ind) (ohm) (ohm) Normal 8 A 5 A 0.3 A 8 A SIL 2 according IEC 61508-2 Type Setting range Switching differential (Tolerance) Maximum working pressure Dimensioned drawing Pressure monitors without differential adjustment p. 21 + 22 DWR06 0,1…0,6 bar 10 ... 50 mbar 6 bar 1 + 15 DWR1 0,2…1,6 bar 40 ... 100 mbar DWR3 0,2…2,5 bar 40 ... 160 mbar 16 bar 1 + 18 DWR6 0,5…6 bar 0,08 ... 0,3 bar DWR625 0,5…6 bar 0,08 ... 0,3 bar 25 bar 1 + 17 DWR16 3…16 bar 0,2 ... 0,6 bar DWR25 4…25 bar 0,3 ... 1,5 bar 63 bar 1 + 16 DWR40 8…40 bar 0,8 ... 1,6 bar Switching differential adjustable DWR06–203 0,1…0,6 bar 0,08 … 0,5 bar 6 bar 1 + 15 DWR1–203 0,2…1,6 bar 0,15 … 0,6 bar DWR3–203 0,2…2,5 bar 0,17 … 1,4 bar 16 bar 1 + 18 DWR6–203 0,5…6 bar 0,3 … 1,7 bar DWR625–203 0,5…6 bar 0,4 … 2,5 bar 25 bar 1 + 17 DWR16–203 3…16 bar 0,75 … 3,15 bar DWR25–203 4…25 bar 1,3 … 6,0 bar 63 bar 1 + 16 DWR40–203 8…40 bar 2,3 … 6,6 bar phone: (86)021-37785053 Mobile:17821719638 www.femachina.com.cn 15 Accessories Pressure switches Pressure transmitters Thermostats Temperature sensors Flow monitors Solenoid valves 15 Mechanical pressure switches Technical features / Advantages Mechanical pressure switches Technical features / Advantages Wall mounting or directly on the pressure line Switching element (microswitch) Lead sealable setpoint adjustment Setting spindle locking element Terminal connection or plug connection to DIN EN175301 Form A Stainless steel sensor housing Stainless steel bellows with internal stop Pressure connection G 1/2" external G 1/4" internal Centring pin Diecast aluminium housing IP 54 or IP 65 version also available phone: (86)021-37785053 Mobile:17821719638 www.femachina.com.cn 16 Mechanical pressure switches Definitions Definitions Pressure data Overpressure Pressure over the relevant atmospheric pressure. The reference point is atmospheric pressure. Vacuum Pressure under the relevant atmospheric pressure. The reference point is atmospheric pressure. Absolute pressure Overpressure relative to absolute vacuum. Differential pressure Difference in pressure between 2 pressure measuring points. Relative pressure Overpressure or vacuum relative to atmospheric pressure. Pressure data in all FEMA documents refers to relative pressure. That is to say, it concerns pressure differentials relative to atmospheric pressure. Overpressures have a positive sign, vacuums a negative sign. Permissible working pressure (maximum permissible pressure) The maximum working pressure is defined as the upper limit at which the operation, switching reliability and water tightness are in no way impaired (for values see Product summary). Bursting pressure (test pressure) Type-tested products undergo a pressure test certified by TÜV affirming that the bursting pressure reaches at least the values mentioned in the Product summary. During the pressure tests the measuring bellows are permanently deformed, but the pressurized parts do not leak or burst. The bursting pressure is usually a multiple of the permissible working pressure. Setting range Pressure range in which the cutoff pressure can be set with the setting spindle. Pressure units Important: All pressure data refers to overpressures or vacuums relative to atmospheric pressure. Overpressures have a positive sign, vacuums a negative sign. In FEMA documents pressures are stated in bar or mbar. Pressure data for a pressure switchbased on the example of DWR625: Setting range: 0.5-6 bar Perm. working pressure: 20 bar Bursting pressure: >100 bar Unit bar mbar Pa kPa MPa (psi) Ib/m² 1 bar 1 1000 10⁵ 100 0.1 14.5 1 mbar 0.001 1 100 0.1 10-4 0.0145 1 Pa 10-5 0.01 1 0.001 10-6 1.45 · 10-4 1 kPa 0,01 10 1000 1 0.001 0,145 1 MPa 10 104 106 1000 1
Definitions Switching differential The switching differential (hysteresis) is the difference in pressure between the switching point (SP) and the reset point (RSP) of a pressure switch. Switching differential tolerances occur due to tolerances in the microswitches, springs and pressure bellows. Therefore the data in the product summaries always refers to average values. In the case of limiter functions the switching differential has no significance, as one is only interested in the switching point at which cutoff occurs, not the reset point. For a controller function, i. e. in the case of pressure switches used to switch a burner, pump etc. on and off, a pressure switch with an adjustable switching differential should be chosen. The switching frequency of the burner or pump can be varied by changing the switching differential. Adjustable switching differential/ calibration In the case of pressure switches with adjustable switching differential, the hysteresis can be set within the specified limits. The switching point (SP) and reset point (RSP) are precisely definable. When setting the pressure switch, the switching differential situation and the type of factory calibration must be taken into account. Some pressure switches (e.g. minimum pressure monitors of the DCM series) are calibrated under "falling" pressure, i.e. switching under falling pressure takes place at the scale value with the switching differential being above it. The device switches back at scale value + switching differential. If the pressure switch is calibrated under rising pressure, switching takes place at the scale value and the device switches back at scale value - switching differential (see direction of action). The calibration method is indicated in the data sheets. Direction of action In principle, any pressure switch can be used for both maximum pressure and minimum pressure monitoring. This excludes pressure limiters, whose direction of action (maximum or minimum) is predefined. The only thing to remember is that the scale reading may deviate by the amount of the switching differential. See example at bottom left: The scale value is 2.8 bar. Maximum pressure monitoring With rising pressure, switching takes place once the preset switching pressure is reached (SP). The reset point (RSP) is lower by the amount of the switching differential. Minimum pressure monitoring With falling pressure, switching takes place once the preset switching pressure is reached (SP). The reset point (RSP) is higher by the amount of the switching differential. Direction of action in vacuum range It is particularly important to define the direction of action in the vacuum range. Rising does not mean a rising vacuum, but rising pressure (as viewed from absolute "0"). "Falling" pressure means a rising vacuum. For example: Vacuum switch set to -0.6 bar falling means: Switching (SP) takes place under falling pressure (rising vacuum) at -0.6 bar. The reset point is higher by the amount of the switching differential (e.g. at -0.55 bar). Setting a pressure switch To define the switching point of a pressure switch exactly, it is necessary to determine the direction of action in addition to the pressure. "Rising" means that switching takes place at the set value when the pressure rises. The reset point is then lower by the amount of the switching differential. "Falling" means exactly the opposite. Please note when specifying the setting of a pressure switch: In addition to the switching point it is also necessary to specify the direction of action (falling or rising). Example for selection of a pressure switch: A pump is to be turned on at 2.8 bar and off again at 4.2 bar. Chosen type: DCMV6 according to data sheet DCM. Setting: Scale pointer to 2.8 bar (lower switching point). Switching differential to 1.4 bar (set according to pressure gauge). Cutoff point: 2.8 bar +1.4 bar = 4.2 bar. Maximum pressure monitoring RSP = SP – xd Minimum pressure monitoring RSP = SP + xd phone: (86)021-37785053 Mobile:17821719638 www.femachina.com.cn 18 Mechanical pressure switches General description Operating mode The pressure prevailing in the sensor housing (1) acts on the measuring bellows (2). Changes in pres sure lead to movements of the measuring bellows (2) which are transmitted via a thrust pin (4) to the connecting bridge (5). The connecting bridge is frictionlessly mounted on hardened points (6). When the pressure rises the connecting bridge (5) moves upwards and operates the microswitch (7). A counter-force is provided by the spring (8), whose pre-tension can be modified by the adjusting screw (9) (switching point adjustment). Turning the setting spindle (9) moves the running nut (10) and modifies the pre-tension of the spring (8). The screw (11) is used to calibrate the microswitch in the factory. The counter pressure spring (12) ensures stable switching behaviour, even at low setting values. Pressure sensors Apart from a few exceptions in the low-pressure range, all pressure sensors have measuring bellows, some made of copper alloy, but the majority of high-quality stainless steel. Measured on the basis of permitted values, the measuring bellows are exposed to a minimal load and perform only a small lifting movement. This results in a long service life with little switching point drift and high operating reliability. Furthermore, the stroke of the bellows is limited by an internal stop so that the forces resulting from the overpressure cannot be transmitted to the switching device. The parts of the sensor in contact with the medium are welded together without filler metals. The sensors contain no seals. Copper bellows, which are used only for low pressure ranges, are soldered to the sensor housing. The sensor housing and all parts of the sensor in contact with the medium can also be made entirely from stainless steel 1.4571 (DNS series). Precise material data can be found in the individual data sheets. Pressure connection The pressure connection on all pressure switches is executed in accordance with DIN 16288 (pressure gauge connection G 1/2A). If desired, the connection can also be made with a G 1/4 internal thread in accordance with ISO 228 Part 1. Maximum screw-in depth on the G 1/4 internal thread = 9 mm. Centring pin In the case of connection to the G 1/2 external thread with seal in the thread (i.e. without the usual stationary seal on the pressure gauge connection), the accompanying centring pin is not needed. Differential pressure switches have 2 pressure connections (max. and min.), each of which are to be connected to a G 1/4 internal thread
 
 
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