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General Information
The
Models FBM-100A and FBM-160 provide fast and continuous detection of free
fluoride ion concentration in water. They are widely used for monitoring
water treatment processes and effluent from wastewater plants. They are
also used in the semiconductor industry to monitor washed water from plants
that use hydrogen fluoride.
The Model FBM-100A is suitable for panel mounting while the Model FBM-160
is designed for outdoor, field mounting. These instuments also feature
an optional water jet cleaner for the ion electrode.
The
measurement method differs from the more complex JIS K 0102 specified
method. It has the advantage of being a much simpler method. However,
this measurement method can be influenced by wide pH and temperature variations
of the sample. Please refer to the paragraph describing sample conditions
to decide on suitability for your particular application.
Features:
- Fast
response time: for a sample containing 2mg/L fluoride ions, an alarm
will be generated within 30 seconds
at 90% response.
-
Low, middle and high ranges available as standard (0~20, 0~200. 0~2000
mg/L).
- 4
alarm outputs available. These can be configured based on user’s
requirements such as concentration alarms, instrument error, under cleaning,
etc.. Concentration alarms are adjustable for delay time and band width.
- Control
outputs (100 VAC) are available for external electrode cleaners such
as water-jet cleaner.
- Output
for sample temperature measurement is available (Model FBM-160).
-
RS-232C output signal for measured concentration,
sample temperature, concentration alarms etc. is available as an option.
Specifications:
| Model Codes: |
FBM-100A
(panel mounting)FBM-160 (outdoor, field mounting) |
| Measurement
Method: |
Fluoride
Ion Selective Electrode |
| Display: |
Digital,
LCD type |
| Measurement
Ranges: |
0.0~99.9
mg/L, 0~999 mg/L or 0~9990 mg/L |
| Output Signal: |
4~20mA DC,
isolated, 650 Ohm Load |
| Output Range: |
Adjustable
within measurement range (minimum 1/10 F.S.). Factory settings: 0.0~20
mg/L, 0~200 mg/L, 0~2000 mg/L. |
| Sample Temperature:
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0~50 deg
C |
| Digital Output
Signal (Option): |
RS232C, Asynchronous,
half duplex, 9600 Baud. Data transmitted includes ion concentration,
electrode signal, sample temperature, concentration alarms, under
maintenance, under cleaning, instrument fault status etc.. |
| Contact Switching
Outputs: |
4 outputs
available (normally open contacts). Select from high limit, low limit,
under cleaning, under maintenance, meter error (factory setting is
OFF). Delay times and band width are adjustable for the high and low
limit alarms. Contact rating: 250 VAC, 3A, or 30VDC, 3A. NOTE: One
set of contacts on the Model FBM-160 is normally closed when de-energized.
It is possible to use this contact as a power fail alarm output signal. |
| Cleaning
System Control Outputs: |
Internal
timer provides 100VAC, 2A output to drive cleaning system such as
water jet cleaner at pre-set intervals. Cleaning cycle adjustable
between 0.1~48.0. Cleaning duration adjustable between 1~999 secs.
Cleaning pulse adjustable between 1~19 times. Standby time after completion
of cleaning adjustable from 0.0 to 99.9 minutes. |
| Temp Compensation: |
Fluoride
ion electrode is corrected using Nernst equation (within 0~40 deg
C of sample temperature). |
| Performance: |
Linearity:
within +/-8% FS (excluding sensor) within +/-30% FS (with sensor)Repeatability:
within +/-5% FS (excluding sensor) within +/-30% FS (with sensor)Response
time: (90%): within 15 seconds (excluding sensor) within 60 seconds
(with sensor) |
| Self Diagnostics: |
Calibration
Error: Displays E0~5 Temperature Sensor Error: Displays
E-12 Memory Error: Displays E-20/21Burn out or error signal
is output |
| Operating
Power: |
90~264 VAC,
50/60 Hz |
| Power Consumption: |
Approx. 10VA
(FBM-100A)Approx. 11VA (FBM-160) |
Individual specifications:
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FBM-100A
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FBM-160
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Installation
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Panel mounting(panel cut-out
: 92 x 92 mm )
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Outdoor, filed installation
(50A pipe, wall or rack mounting)
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External dimensions
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96(w) x 96(h) x 90(d) mm
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181(w) x 180(h) x 95(d) mm
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Enclosure Rating
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Indoor installation type (IP-30)
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Outdoor installation type,
dust and splash proof (IP-65)
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Materials of construction
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Main body: AluminiumDisplay:
Polyester
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Main body: Aluminium die castDisplay:
Polyester
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Surface finish
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Display: Pale Yellow
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Main body: Metallic silver
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Cable entry
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Not applicable
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G1/2 x 6 (with 6~12mm diameter
cable gland)
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Ambient Temp and humidity
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-10~50 deg C90% RH or less
(no condensation)
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-20~55 deg C95% RH or less
(no condensation)
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Weight
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Approx. 0.5 kg
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Approx. 2 kg
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Water Temp output signal
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Not applicable
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Adjustable in 10 deg C widths
with 1 deg C units. Factory setting 0.0~50.0 degC
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Principle
of Operation
The fluoride
ion selective electrode generates an electromotive force corresponding
to the fluoride ion concentration in water. The relationship between the
concentration and the electromotive force is logarithmically linear as
shown in the diagram to the right. The instrument, calibrated with standard
solution, can determine the fluoride ion concentration of the sample by
just immersing the electrode into the sample.
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Sample pH:
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To be stable
within ph4~9 (see Note 1)
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Sample Temperature:
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To be stable
within 0~40 deg C (see Note 2)
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Sample Conductivity:
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50 mS/m (500
microS/cm) or greater
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Flow velocity:
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0.01~0.2 m/s
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Coexisting
components:
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Low values
of calcium, aluminium, iron etc. (see Note 3)
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NOTE 1:This
instrument cannot detect fluoride under sample conditions of pH 4 or
less because HF exists as molecules (not ionized) under these condition.
For samples of pH 9 or above, the influence from OH- ions increases
and influences the measurement. Also for large variations in pH, the
fluoride conditions change and it may change compounds that cannot be
detected. For reliable measurement, the pH value should be kept as stable
as possible.
NOTE 2:Calcium
salts present in the sample dissolve in greater qualities with increasing
sample temperatures causing a positive interference on measurement result.
The sample temperature should be kept as stable as possible and kept
below 40 degC in order to avoid maintenance troubles.
NOTE3:Calcium,
aluminium, iron, etc. can combine with fluoride to form compounds that
are different from fluoride ions and cannot therefore be detected by
this instrument. Under these circumstances, the measured value would
be different to that obtained from the conventional JIS measurement
method. The conventional JIS method measures total fluoride (including
the above mentioned compounds by distillation method).
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