The intrinsically safe explosion proof design means that any heat in a product cannot lead to an explosion, even if two breaches of safety occur. Furthermore, if any component in the equipment installed in a hazard area is shorted, it will not create a spark. This function has to be confirmed by an official institute using ignition tests and other criteria.
Therefore, there is no need for a special pressure resistant case as long as the equipment is wired in conformance with explosion proof guideline 2500 (wiring of intrinsically safe circuits) for plant electrical facilities.
Capacitance level meters
LB/DB series
- Capacitance level meter with high sensitivity and stability
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Can even measure powders and granules, not just liquids. Good linearity for a wide measurement range, not affected by wide temperature drift.
Various electrodes are available including rod electrodes and wire electrodes. An intrinsically safe explosion proof model is also available.
Features, keys |Intrinsically safe explosion proof |Usages, use examples |Standard specifications
Features, keys
- Stable measurement in a harsh environment
Stably outputs signals even at high sensitivity levels. Good noise immunity. - Unique measurement circuit allows precision measurements
Good linearity for a wide measurement range. A shielded cable is used, eliminating dispersion of the capacity of cables between electrode and amplifier. Therefore, the unit is not affected by temperature drift of the cable’s capacity. - Stably measures for weak conductivity, such as faulty insulation on electrodes due to condensation
- No moving parts and long service life
Intrinsically safe explosion proof
Intrinsically safe explosion proof type DB-209
(Features)
• A 2-line system is employed between the sensor, zener barriers, and power supply. The meter is economical and add to safety.
• High zero point precision against temperature change.
• A cassette type amplifier is used so it is easy to maintain.
Usages, use examples
- Measures liquids, powders, and granules continuously
- Measure conductive, non-conductive liquids, non-conductive liquids with a small dielectric constant
Standard specifications
LB-110 (non explosion proof type)
Amplifier
| Power source required | 105/210V AC ±10% 50/60Hz |
|---|---|
| Current output | Current output 4 to 20mA/DC (load resistance 450Ω or less) |
| Voltage output | 0 to 10 V DC (for checking) |
| Measurement range | Full scale: 10 to 100pF variable 100 to 1000pF variable, switch between 2 ranges (Other specifications are also available by agreement) |
| Precision | Linearity error: ±0.5% X specified value |
| Temperature characteristics | Zero point error for -20 to 80 degrees : +-0.2pF (when the cable length is 10m or less) |
| Sensitivity error | +-0.5% X specified value, or less |
Sensor
| Shape | Bare rod sensor (S2) Bare wire sensor (S2W) Coated rod sensor (S1) Coated wire sensor (S1W) (Other shapes and dimensions to match your tank and temperature range are available on request.) |
|---|---|
| Installation (connection) | PT3/4 and other flanges (3/4B or larger) (S1, S2) PT1 and other flanges (1B or larger) (S1W, S2W) |
| Material of the parts that contact liquid | SUS304 (S2, S2W) FEP (S1) ETFE (S1W), (can be altered on request) |
| Allowable temperature | -5 to +80 degrees (standard specification) S1, S2, S1W, S2W Max150 degrees(S1T) Max120 degrees(S1WT) (high temperature specification) Max180 degrees(S2T) Max180 degrees(S2WT) (high temperature specification) |
| Allowable pressure | 2MPa max (20 degrees) |
DB-209 (Intrinsically safe explosion proof type)
Amplifier
| Power source required | 100/200V AC ±10% 50/60Hz |
|---|---|
| Current output | 4 to 20mA DC (load resistance: 450Ω or less) |
| Measurement range | Full scale: 0 to 2000pF, variable |
| Precision | Linearity error 1% |
| Temperature characteristics | Zero point error 0.2pF at temperature characteristics -20 to 60 degrees |
| Ambient temperature | -20 to 60 degrees |
Sensor
| Shape | Bare rod sensor (S2) Bare wire sensor (S2W) Coated rod sensor (S1) Coated wire sensor (S1W) (Other shapes and dimensions to match your tank and temperature range are available on request.) |
|---|---|
| Installation (connection) | PT3/4 and other flanges (3/4B or larger) (S1, S2) PT1 and other flanges (1B or larger) (S1W, S2W) |
| Material of the parts that contact liquid | SUS304 (S2, S2W) FEP (S1) ETFE (S1W), (can be altered on request) |
| Allowable temperature | -5 to +80 degrees (standard specification) S1, S2, S1W, S2W Max150 degrees(S1T) Max120 degrees(S1WT) (high temperature specification) Max180 degrees(S2T) Max180 degrees(S2WT) (high temperature specification) |
| Allowable pressure | Water pressure 20kg/cm2max (20 degrees) |
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