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卓尔瑞华（北京）科技有限公司
卓尔瑞华（北京）科技有限公司
WIKA MA1 膜片式压力开关 EEx-d 防爆 IP65 过压100bar PED证书
| 类型： | 机械压力开关 | 额定电压： | 220（V） |
| zui大工作压力： | 100bar（Pa） | 型号： | MA1 |
| 额定电流： | 15（A） | 品牌： | WIKA/威卡 |
| 机械寿命： | 100（万次） | 产品认证： | CE |
| 加工定制： | 是 |
WIKA MA1 膜片式压力开关 EEx-d 防爆
IP65 过压100bar PED证书
Diaphragm pressure switch
Ex protection Ex-d, IP 65
Model MA1
Diaphragm pressure switch model MA1
Applications
■ Pressure monitoring and direct switching of electrical loads
■ For measuring points with increased overpressure
■ For gaseous and liquid, aggressive and highly viscous or contaminated media, also in aggressive ambience
■ Process industry: Chemical/petrochemical, on- and offshore, technical gases, environmental technology,machine building and general plant construction, water treatment, pharmaceutical industry
Special features
■ Case flameproof enclosure
■ Ingress protection IP 65, NEMA 4
■ Ambient temperature -40 ... +85 °C
■ 1 or 2 independent switch points, high contact rating up to 15 A / AC 220 V
■ Setting ranges from 200 mbar, max. test pressure up to 40 bar
Description
These high-quality pressure switches have been developed especially for safety-critical applications. The high quality of the products ensures reliable monitoring of your plant. The manufacturer Cella is certified to ISO 9001. In production, the
switches are traced by quality assurance software at every step and subsequently are 100 % tested.
All wetted materials are made from stainless steel as a standard. Each switch family is available in IP65, Ex-ia or Ex-d versions.
In order to ensure as flexible operation as possible, the pressure switches are equipped with micro switches, whichmake it possible to switch an electrical load of up to 15 A / AC 220 V directly. For smaller contact ratings, such as for PLC applications, Argon gas-filled micro switches with gold-plated contacts can be selected as an option.
By using a diaphragm measuring system, the model MA1 pressure switch is extremely robust and guarantees optimal operating characteristics. For applications requiring particularly high corrosion protection, variants with PTFE or
Monel wetted parts are available.
Switch points
The switch points can be set to your requirements, free-ofcharge.
Please specify:
Switch point, switching direction for each contact （e.g. switch point 1: 0.5 bar, falling, switch point 2: 3 bar, rising）
With two micro switches, the switch points can be set independently of each other.
After unscrewing the case cover, switch point adjustment can be made using the adjustment screw. The switch point is settable within the entire measuring range with the following
general rule:
■ Define the value A = 2 x repeatability + switch hysteresis
■ If the pressure is rising, the switch point should be set between （min. + value A） up to max. of the setting range
■ If the pressure is falling, the switch point should be set between min. up to （max. - value A） of the setting range
Example:
Setting range: 0 ... 1 bar with one switch contact
Repeatability: 1 % of 1 bar = 10 mbar
Switch hysteresis = 15 mbar （see table setting ranges）
Value A = 2 x 10 mbar + 15 mbar = 35 mbar
If the pressure is rising, the switch point should be set between 35 mbar up to 1 bar.
If the pressure is falling, the switch point should be set between 0 up to 965 mbar.
For optimal performance we suggest the switch point lies between 25 % and 75 % of the setting range.
Electrical connection
½ NPT female, cable connection using internal terminal block, protective conductor connection using internal and xternal screw, max. earth cable cross-section 4 mm2
Pressure switch certified per:
■ Pressure equipment directive 97/23/EC （PED, annex 1,category IV, safety accessories, module B + D）
■ Low voltage directive 73/23 EEC and 93/68 EEC
Dielectric strength
Safety class I （EN 61298-2: 1997-06）
Mounting
Direct or wall mounting
Preferred connection location of the process connection should be below. Alternatively the instrument can be installed so that internal access is from the front of the enclosure and the electrical connection is located on the side.
Weight
approx. 3.1 kg
Options
■ Other process connection, also with adapter
■ Electrical connection 3/4 NPT, G 1/2 or M20 x 1.5 （female）
■ Cable gland on request
■ 2" pipe-mounting kit （with clamping element）
■ Version for off-shore or tropicalised application 9）
■ Version for applications to NACE 9） 10）
■ Version for ammonia applications 9）
■ Oil and grease free version for oxygen applications
■ Accessories:
Pressure gauge valves model 910.11, see data sheet AC 09.02
Barstock valves model 910.81, see data sheet AC 09.18
9） Inert gas filled contacts required
10） Max. test pressure 100 bar only with setting ranges 0 ... 16 bar and 0 ... 25 bar
11） Max. 1 switch contact
Approvals and certificates
■ SIL 2 version 9） 11）
■ GOST-R certificate
■ Test certificate *CA* （confirmation of the switching accuracy）
■ Test report *CP* （3-time listing of the switch point, requires switch point specification）
■ Material certificate 3.1 per EN 10204
Ordering information
Model / Wetted parts / Switch contacts with version / Setting range / Process connection / Electrical connection / Switch point（s） / Switching direction（s） / Options
Example: MA1 - TX - U1 - 0/6 bar - 1/4"NPT-F - 1/2"NPT-F
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