1
INTRODUCTION - 1
Martek Instruments, Inc.
1.0
W
HAT
I
S
A C
ALIBRATOR
?
The Martek Mark 22 In-Situ Calibrator is
a completely portable, battery-operated elec-
tronic instrument that can be used to vali-
date the performance and accuracy of on-
line, process water monitoring instruments.
The In -Situ Calibrator is designed for use in
applications in which the measurement of
water properties such as temperature, con-
ductivity, temperature-corrected conductiv-
ity, and pH are required.
The Mark 22 can be calibrated in the labo-
ratory to ASTM ( American Society for Test-
ing of Materials ) or NIST (National Institute
of Standards and Testing) guidelines and
procedures using any manufacturer’s con-
ductivity reference cell or pH electrode. The
portability of the unit allows it to then be
transferred to the sample stream for direct,
on-site monitoring of the water properties
used to determine water quality.
1.1
H
OW
C
AN
T
HE
M
ARK
22
B
ENEFIT
Y
OU
?
By eliminating the need for physical grab
samples, the Mark 22 provides a more reli-
able and efficient method for validating
and/or calibrating on-line instrumentation.
Its accuracy and resolution allow the opera-
tor to detect subtle changes in water chemis-
try that can affect the turbine steam quality ,
the performance of condensate polishers,
resin beds, and other process systems.
In addition, the Mark 22 features battery
backed up NVM memory in which moni-
tored data can be stored and retrieved later
by a personal computer via the units serial
port for storage, review and analysis. As an
alternate recording method, a serial data in-
put printer can be connected to the serial port
of the Mark 22 in applications in which a
hardcopy record of the data stored in the
Mark 22 In-Situ Calibrator is required. This
feature allows the operator to create and
maintain a historical record of calibration and
performance data for on-line instruments.
The Mark 22 can also serve as a back-up
monitoring system in the event of on-line
equipment failure. A 0-1 Volt analog output
signal for all parameters is also available to
facilitate the interface of the Mark 22 directly
to a paper strip-chart recorder.
1.2
H
OW
T
O
R
EAD
T
HIS
M
ANUAL
Carefully review the material in this
manual before operating the Mark 22. The
OVERVIEW in Chapter 2 provides brief de-
scriptions of the features of the calibrator and
an example of a quick calibration procedure
for conductivity. Chapter 3 reviews the speci-
fications for the instrument and gives a de-
tailed description of how to set up the unit.
The complete operational instructions are
outlined in Chapter 4, and Chapter 5 details
the calibration procedure. The MAINTE-
NANCE & TROUBLESHOOTING chapter
provides routine maintenance requirements
for the Mark 22 and its probes.
Should you have any questions or com-
ments regarding the Mark 22, its sensors, or
this Manual, please contact the factory.
