MODEL 54e pH/ORP SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
The Model 54e when configured as a pH analyzer,
requires a dual (glass and reference) impedance pre-
amplifier (patent pending).This preamp converts the
high impedance pH glass electrode signal to a low
impedance signal.The preamplifier may be located in
one of three areas: 1) in the pH sensor for best per-
formance, 2) in a remote junction box when process
temperatures exceed 80°C (176°F) in submersion
applications, or 3) in the analyzer when the distance
between the pH sensor and the analyzer is 4.5 meters
(15 feet) or less.
The Model 54e pH measures over the full range of 0-
14 pH.The current output may be calibrated to repre-
sent any 1 to 14 pH span.
A two-point calibration is made by immersing the sen-
sor in two different buffer solutions and entering the
pH values. When two buffers are used, the micro-
processor automatically calculates the electrode slope
which is used for self-diagnostics.The electrode slope
can be read on the display and manually adjusted. A
one-point process standardization is easily accom-
plished by entering the pH value of a grab sample.
ANALYZER SPECIFICATIONS @ 25°C
Measurement Range: 0 to 14 pH
Output Scale Expansion: Zero suppression: up to 13
pH units
Span: Any pH from 1 to 14
Accuracy: ± 0.01 pH
Repeatability: ± 0.01 pH
Stability: ± 0.01 pH/month, non-cumulative
Temperature Coefficient: Input: ± 0.003 pH/°C
Output: ± 0.006 pH/°C
Temperature Compensation: Pt 100 or Pt 1000 RTD,
Automatic or Manual
–15 to 120°C (5 to 248°F)
RECOMMENDED SENSORS:
Model 320HP High Purity pH
Model 328A Steam Sterilizable pH
Model 370 EuroSenz™ pH
Model 371 Disposable pH
Model 381+ Insertion/Submersion/Flow Through pH
Model 389 Disposable pH
Model 396 Disposable pH
Model 396VP Disposable pH with VP 6.0 connector
Model 396P Disposable pH
Model 396R Retractable pH
Model 396RVP Retractable pH with VP 6.0 connector
Model 397 Quik Disconnect pH
Model 399 Disposable pH
The Model 54e when configured as an ORP analyz-
er, measures over a range of -1400 mV to +1400 mV
in either the American convention (Oxidation
Reduction Potential), or the European convention
(Reduction Oxidation-Redox). Although temperature
compensation is not used for ORP measurements, the
process temperature is measured and displayed.
Temperature measurement is made by an RTD locat-
ed in the sensor assembly.
ANALYZER SPECIFICATIONS @ 25°C
Measurement Range: –1400 to +1400 mV
Output Scale Expansion: Zero suppression: up to
±1300 mV
Span: Any ORP range from 100 to 2800 mV
Accuracy: ± 1.0 mV
Repeatability: ± 1.0 mV
Stability: ± 1.0 mV/month, non-cumulative
Temperature Coefficient: Input: ± 0.2 mV/°C
Output: ± 0.4 mV/°C
Temperature Measurement: –15 to 120°C (5 to 248°F)
Pt 100 or Pt 1000 RTD
RECOMMENDED SENSORS:
Model 371 Disposable pH
Model 381+ Insertion/Submersion/Flow Through ORP
Model 389 Disposable ORP
Model 396P Disposable ORP
Model 396R Retractable ORP
The Model 54e when ordered for ISE capability,
is suitable for use with a number of ion-selective elec-
trodes. Consult the factory for available measurements
and ranges.
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