D502/7D. D502/7DK Pressure Switches The pressure switches use bellows-type sensors. Shanghai ZhongHe Automation Instrumentation co., LTD. They can be used for neutral gases (such as air. Gas. water steam. etc) and liquid medium (such water. refrigerants. oil. etc) The set point of the pressure switch is adjustable. The adjustable range of set point is -0.1—4MPa. □ Main Technical Data Working Viscosity:<1×10-3m2/s. switching Element: micro-switch. Housing Protection Grade: IP65 (Accord with DIN40050 and corresponding to IP65 in GB4208) Ambient Temperature: -40 ~ +50℃. Medium Temperature: 0 ~ +120℃. Vibration Resistance: D502/7D:40m/s2; D502/7DK:20m/s2. Repeatability error: ≤1%. Contactor Capacity: AC 220V 6A (reaistance) (as for special requirements, you may refer to the Application Manual written by this factory) □ Features Suitable for vacuum Action procedure of the single-pole double throw micro-switch: The connecting terminals 1-3 will be connected when the pressure rises to the upper limit of the switching value; and the connecting terminals 1-2 will be disconnected when the pressure rises to the upper limit of the switching value. □ Specifications (D502/7D) ·Switching Difference is Non-adjustable: Adjustable Range of Set point MPa Switching Difference (Not Ureatar Than) Max. Allow-able Press-ure* MPa Number of Switch-ing Cycles 1/min Pressure Sensor Materials Processs-ing Connecti-on (External Thread) Weight Kg Outline Dimen-sions (Drawing Number) Order Number Lower Limit of Set Point range MPa Upper Limit of Set Point range MPa Housing Bellows -0.1~0 -0.1~0.1 -0.1~0.16 -0.1~0.25 0.006 0.007 0.008 0.009 0.007 0.008 0.009 0.012 1 1 1 1 20 Brass Stainese steel 00Gr17 Ni14 Mo2 (316L) G1/4 G1/4 G1/4 G1/4 1.0 1.0 1.0 1.0 01 01 01 01 0810100 0810200 0810300 0810400 0~0.1 0~0.16 0~0.25 0.007 0.008 0.009 0.008 0.009 0.01 1 1 1 G1/4 G1/4 G1/4 1.0 1.0 1.0 01 01 01 0811100 0811200 0811300 0.02~0.4 0.03~0.6 0.03~1 0.03 0.03 0.03 0.03 0.035 0.04 2 2 2 G1/4 G1/4 G1/4 0.85 0.85 0.85 02 02 02 0811400 0811500 0811600 0.05~1.6 0.05~4 0.07 0.07 0.08 0.09 5 5 G1/4 G1/4 0.9 0.9 03 03 0811700 0811800 ·Switching Difference is adjustable: (D502/7D) Adjustable Range of Set point MPa Switching Difference (Not Ureatar Than) Max. Allow-able Press-ure* MPa Number of Switch-ing Cycles 1/min Pressure Sensor Materials Processs-ing Connecti-on (External Thread) Weight Kg Outline Dimen-sions (Drawing Number) Order Number Lower Limit of Set Point range MPa Upper Limit of Set Point range MPa Housing Bellows -0.1~0 -0.1~0.1 -0.1~0.16 -0.1~0.25 0.018~0.08 0.019~0.1 0.02~0.2 0.022~0.25 0.019~0.08 0.021~0.1 0.022~0.2 0.024~0.25 1 1 1 1 20 Brass Stainese steel 00Gr17 Ni14 Mo2 (316L) G1/4 G1/4 G1/4 G1/4 1.05 1.05 1.05 1.05 01 01 01 01 0800100 0800200 0800300 0800400 0~0.1 0~0.16 0~0.25 0.015~0.08 0.018~0.1 0.02~0.2 0.016~0.08 0.02~0.1 0.024~0.2 1 1 1 G1/4 G1/4 G1/4 1.05 1.05 1.05 01 01 01 0801100 0801200 0801300 0.02~0.4 0.03~0.6 0.03~1 0.08~0.25 0.08~0.5 0.09~0.8 0.08~0.25 0.09~0.5 0.1~0.8 2 2 2 G1/4 G1/4 G1/4 0.9 0.9 0.9 02 02 02 0801400 0801500 0801600 0.05~1.6 0.05~4 0.17~1.2 0.18~2 0.19~1.2 0.2~2 5 5 G1/4 G1/4 0.95 0.95 03 03 0801700 0801800 □ Switch selecion and Mounting Instructions ·When selecting a pressure switch, it is recommended that the expected set point can be in middle area of the Adjustable Range of Set Point of the switch; and usually, this area covers 20%-80% of the adjustable range. ·When the switch is installed outdoors, sufficient protection should be provided, so as to avoid the violent change of environmental temperature, the direct radiation of sun-light, and the penetratin of corrosive gas or water. ·When installing the cable, suitable outside diameter of cable should be selected. The holding-down nut located at the position wher the cable has been led in should be tightened, so as to prevent the cablefrom being slack, as well as to avoid the penetration of water or dust. ·As for the controlled liquid dielectric having a pressure peak and pulsed pressure, a pressure shock damper can be mounted on the connector of the switch, so as to eliminate the unfavourable affection. ·the on-off current can not exceed the rated value. ·When installing (or removing) the switch, special attention should be paid to the following points: In installation (or removing), the plane part of the sensor must be clamped down by use of a wrench, so as to absolutely prevent the sensor and the switch housing from rotating relatively to each other. (As shown in the following diagram). The deepness for which the pipe connector is screwed into the sensor should not exceed 12mm.