Quick-Cal" Calibration Procedures - Martek MARK 22 Operation Manual

2 - OVERVIEW
ber of scans.
8. The PRINT Mode allows printing of the
various data files by file number. To print
or record data from the Mark 22's inter-
nal memory the unit must be connected
via its serial port to computer or printer
which has a serial input interface. This
interface must be configured with the
same baud rate, # of data bits, stop bits,
and parity type configured inside the
Mark 22 for serial communications. Re-
fer to the section 4.2.4 of this Manual for
more detailed information regarding the
print function.
2.1 "Q -C
UICK AL
P
ROCEDURE
This section provides an easy reference
or "quick-cal" procedure for electronically
calibrating the Mark 22 for conductivity mea-
surements. However, before performing a
calibration of the Mark 22 using this proce-
dure, it is recommended that you review
Chapter 5 ( CALIBRATION ) of this manual.
Calibration procedures for all parameters
are located in the CALIBRATION section of
this Manual.
1. Select a cell number for calibration. De-
press the CELL key and select a cell num-
ber 1 - 4. ( Select a K factor of .01000 for
ultrapure process water applications ).
2. Place the Mark 22 in Manual Display
Mode for the conductivity parameter.
3. Using the range keys (UP and DOWN
ARROWS), set the decimal point to read
the highest range (XXX.XX µS/cm).
4. Select the SETUP Mode of operation by
depressing the SETUP key. From the
setup menu select the CAL option. Select
COND option from the CAL menu menu
as the type of parameter to be calibrated.
Select ZERO as the type of cali-
4
" C
ALIBRATION
bration to be performed. Connect the zero
calibration plug (P/N 400550) to the test
leads. The voltage should be approxi-
mately -1.000 Volt. Enter the zero value
for conductivity by pressing the SELECT
key and entering 000.00 µS/cm.
5. Exit the set ZERO point function by de-
pressing the EXIT key. Using the range
keys (UP and DOWN ARROWS), set the
displayed measured value to the lowest
range (0.0000 µS/cm).
6. Select the SETUP Mode of operation by
depressing the SETUP key. From the
setup menu select the CAL option. Select
COND from the displayed menu as the
parameter to be calibrated. Select SPAN
as the type of cali-bration to be per-
formed. Remove the zero calibration plug
and make sure the span calibration plug
(P/N 400549) has been placed between
the test leads. The voltage should be ap-
proximately +0.5000 Volts. Enter the span
value for conductivity by pressing the SE-
LECT key and entering 1.0000 µS/cm.
7. At this point, the Mark 22 is now cali-
brated for conductivity for any sensor uti-
lizing a cell constant of 0.01. But before
measurements can be taken, depress the
CELL key and select a cell with the same
cell constant as the specific conductivity
reference sensor. Depress the CELL key
again to return the Mark 22 to the manual
display mode.
N O T E S :
1. If not using a Martek Conductivity Reference
Cell, the temperature sensor must be connected.
2. Temperature must always be calibrated before
conductivity and pH.
3. Use a 1K Ohm, .5% resistor for 10 µS/cm range.
4. Use a 100 Ohm, .5% resistor for 100 µS/cm
range.
Martek Instruments, Inc.