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The characteristics of 26G radar level meter:
Ø Small antenna size, easy to install; Non-contact radar, no wear, no pollution.
Ø Almost no corrosion, bubble effect; almost not affected by water vapor in the atmosphere, the temperature and pressure changes.
Ø Serious dust environment on the high level meter work has little effect.
Ø A shorter wavelength, the reflection of solid surface inclination is better.
Ø Beam angle is small, the energy is concentrated, can enhance the ability of echo and to avoid interference.
Ø The measuring range is smaller, for a measurement will yield good results.
Ø High signal-to-noise ratio, the level fluctuation state can obtain better performance.
Ø High frequency, measurement of solid and low dielectric constant of the best choice.
| Application： | All kinds of corrosive liquid |
| Explosion-proof Grade： | ExiaⅡC T6 Ga/ Exd ⅡC T6 Gb |
| Measuring Range: | 10m /20m /30m /70m /80m |
| Process Connection： | Thread, Flange |
| Process Temperature： | -40℃~130℃ |
| Process Pressure: | (-0.1 ~ 0.3) Mpa |
| Accuracy： | ± 5mm |
| Protection Grade： | IP67 |
| Frequency Range: | 26 GHz |
| The signal Output: | (4 ~ 20) mA/HART (2-wire /4-wire) RS485/ Modbus |
| Supply : | 2-wire（DC24V）/ 4-wire（DC24V /AC220V） |
| Outer Covering : | Aluminum /Plastic /Stainless steel |
2. The Electrical Connection
l The power supply voltage:
| (4~20)mA/HART (Two wire system) | The power supply and the output current signal sharing a two core shield cable. The supply voltage range see technical data. For intrinsically safe type must be a safety barrier between the power supply and the instrument. |
| (4~20)mA/HART(Four wire system) | Separate power supply and the current signal, respectively using a two-core shielded cable. The supply voltage range see technical data. |
| RS485 / Modbus | Power supply and Modbus signal line separated respectively using a two-core shielded cable, the power supply voltage range see technical data. |
l Connection mode:
Ø 24V two wire wiring diagram as follows:
Ø 6~24V RS485/Modbus wiring diagram as follows:
l Explosion Proof Connection
The intrinsic safety version sensors (Exia IIc T6) use Alu-die casting housing and filling Silicone rubber sealants internal structure aimed to prevent sparks resulted from circuit failure from leaking out. It is applicable for the continuous level measurement of flammable medium under Exia IIc T6.
A safety barrier FBS-2 must be used together with the intrinsic safety instrument. It is an associated device to this product for the power supply of this product. The main specification is intrinsic safety: Exia IIC, voltage of power supply: 24V DC±5%, short-circuit current: 135mA, operating current: 4...20mA.
All cables must be shielded. The max length is 500m for the cable from the barrier to the sensor. Stray capacitor≤0.1μF/Km, stray inductance 1mH/Km. Instrument must be connected to the ground potential. Any unapproved associated device is not allowed to be used.
l Protection grade:
This instrument meets the protection class IP66/67 requirements, please ensure the waterproof cable sealing head. The following diagram:
How to install to meet the requirements of IP67:
Please make sure that the sealing head is not damaged.
Please make sure that the cable is not damaged.
Please make sure that the cable for use with electrical connection specification.
Cable into the electrical interface before its curved downward, ensure that the water will not flow into the shell, see the①
Tighten the cable seal head, see the②
Please electrical interface will not use blind plug tight, see the③
3. Instrument Commissioning
l There are three kinds of debugging method:
1) Display / Keyboard
2) Host debugging
3) HART handheld programmer
l Display / Keyboard:
Please debug the instrumentation by four buttons on the display screen. There are three debug menu languages optional. After debugging is generally used only for display, through the glass window can read measured value very clearly.
4. Structure Size (Unit: mm)
l
The outer shell:
l Appearance size:
901
902
903
904
905
906
l Flange type:
5.Technical Parameters
| Process Connection | Thread G1½″A / Thread 1½″ NPT / Flange |
| Antenna Material | Stainless Steel / PTFE |
| The outer shell | |
| The seal between the shell and the shell cover | Silicone rubber |
| Casing window | Polycarbonate |
| The ground terminal | Stainless steel |
| The power supply voltage | |
| Two wire system | |
| The standard type | (16 ~ 26) V DC |
| Intrinsically safe | (21.6 ~ 26.4) V DC |
| Power dissipation | max 22.5mA / 1W |
| Allowable ripple | |
| Flameproof | |
| (22.8 ~ 26.4) V DC | 2-wire system |
| (198 ~242)V AC | 4-wire system / 110V AC 4-wire system |
| The cable parameters | |
| Cable entrance / plug | 1 M20xl.5 cable entrance |
| 1 blind plug | |
| Terminal | Conductor cross section 2.5mm² |
| Output parameters | |
| The output signal | (4 ~ 20) mA/RS485 |
| Communication protocol | HART |
| Resolution | 1.6μA |
| Fault signal | Constant current output; 20. 5mA |
| 22mA | |
| 3.9mA | |
| The integral time | (0 ~ 36) s, adjustable |
| Blind area | the ends of the antenna |
| The maximum distance measurement | |
| 901 | 10 meters （Liquid type） |
| 902 | 30 meters （Liquid type） |
| 902T | 20 meters （Liquid type） |
| 903 | 70 meters （Solid type ） |
| 904 | 80 meters （Solid type ） |
| 905 | 30 meters （Solid type ） |
| 906 | 20 meters （Liquid type） |
Microwave frequency | 26GHz |
| Communication interface | HART communication protocol |
| The measurement interval | about 1 second (depending on the parameter settings) |
| Adjust the time | about 1 second (depending on the parameter settings) |
| Display resolution | 1 mm |
| Working storage and transportation temperature | (-40～100)℃ |
| Process temperature (the temperature of the antenna part) | |
| 901 | (-40～130)℃ |
| 902/903/904/905 | (-40～250)℃ |
| 906 | (-40～130)℃ |
| Pressure | Max.4MPa |
| Seismic | Mechanical vibration l0m/s², (10 ~ 150) Hz |
6. Meter Linearity
901
Emission angle 20°
Precision See chart
902
Emission angle Depending on the size of the antenna
-￠46mm 18°
-￠76mm 12°
-￠96mm 8°
-￠121mm 6°
Precision See chart
902T
Emission angle Depending on the size of the antenna
-￠76mm 14°
Precision See chart
903
Emission angle Depending on the size of the antenna
-￠46mm 18°
-￠76mm 12°
-￠96mm 8°
-￠121mm 6°
Precision See chart
904
Emission angle Depending on the size of the antenna
-￠196mm 4°
-￠242mm 4°
Precision See chart
905
Emission angle Depending on the size of the antenna
-￠76mm 12°
-￠96mm 8°
-￠121mm 6°
Precision See chart
906
Emission angle Depending on the size of the antenna
-￠76mm 12°
Precision See chart
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