The EX800 Series mag meter is designed to handle a wide variety of fluids, clean or dirty, corrosive or not, viscous or not, as long as the fluid is conductive (minimum 20 uS/cm, good for almost anything but very pure water). The meters work on an electromagnetic principle: a magnetic field is applied and the electrodes measure the electric voltage in the fluid to determine the flow rate. Therefore, there are no moving parts, and it is less affected by things that are troublesome with mechanical meters. But, when using with chemical injection systems, it is preferred that the chemical be injected downstream (or far enough upstream to allow complete mixing), otherwise the erratic conductivity of the fluid would cause instability in the flowmeter reading.
The EX800 series meters come in 3 different size ranges, indicated by the first 4 characters of the model number:
EX81 for 1″-3″ pipe
EX82 for 4″-10″ pipe
EX83 for 12″ pipe
The next digit of the model number indicates what (if any) electronic module is mounted on the unit:
EX8?0: Sensor only, with current-sinking pulse output for wiring to external device, e.g., wall- or panel-mounted electronic module
The following character indicates what material the sensor body is made from:
EX8??B: Brass
EX8??P: PVC
EX8??S: 316 Stainless Steel
Other options available (dependent on electronics module):
Reverse Flow Output ("-15"): All units provide an open-collector isolated pulse input proportional to the forward flow of the fluid. With this option, there will be an additional output available that will be proportional to the flow of the fluid in the reverse direction. An additional display unit will be required to receive this output.
Tamper-Evident Kit ("-32"): A wire with a seal runs through the screws, so that the unit can't be opened without breaking the seal.
Immersible Option ("-40"): (For the EX8?0 "Sensor Only" models.) This provides protection for the sensor in case the installation location is submerged. Immersible to maximum of 3 ft (1m), up to 2 weeks.
Low Power Option ("-50"): Standard units use about 250 mA of current. This is usually supplied by the device that the sensor is connected to. If the system is to be powered by a battery (e.g., with a solar panel), than you should specify this option, which uses an average of just 40 mA.
Non-Resettable Total ("-64"): Flowmeters that have the FT430 or FT440 module (EX8?3 or EX8?9 series) can optionally have it so that the total flow displayed cannot be reset to zero.
Dual Relay Output ("-98"): Adds a dual relay board to FT430/FT440 models.
Viton O-Ring ("-125"): The sensors have an O-ring to seal itself in the fitting. Normally, this is made from EPDM, but if you need increased chemical resistance than use the Viton O-ring.
Hinged Display Cover ("-126"): A protective clear cover over the display/keypad of FT430/FT440 modules (EX8?3/EX8?9 series). Recommended for all outdoor applications.
Data Logger ("-127"): Flow data logged internally, to be extracted to a laptop for analysis.
Further Information
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