© Hach Company, 2007. All rights reserved. Printed in Germany.
For technical assistance or ordering information: visit
www.hach.com
, call 800-227-4224 or email [email protected] Edition 1 December 2007
Quick Start Guide
For si792 P series 2-wire transmitters
DOC016.53.00794
Additional copies are available on www.hach.com
DANGER: Explosion Hazard. This Quick Start Guide is intended for setup of the si792
transmitter in a non-hazardous location. It is not a substitute for reading and following
the instructions in the user manual. Installation in a hazardous location must be
performed by qualified personnel per the applicable control drawing or ATEX certificate
on the prived documentation CD.
DANGER: Electric Shock Hazard. Disconnect power to all wiring before making
connection to the si792 P series transmitters.
1.
Connect the 24 VDC power and communication (
Table 1
).
2.
Connect the sensor wires (
Table 2
).
Basic transmitter configuration—si792(x) P (4–20 mA/HART) only
Note:
Refer to the manual for si792x P-FF (Foundation Fieldbus) and si792x P-PA (Profibus PA)
configuration instructions.
1.
To enter the configuration mode, press
CONF
, configuration code:
1200
,
ENTER
. There are 4
configuration menus:
• output "out.1MNU"
• temperature compensation "tc MNU"
• calibration setup "CAL MNU"
• alarm settings "ALrt MNU"
2.
In configuration mode, press the
RIGHT ARROW KEY
to navigate to a specific configuration menu.
Press
ENTER
to access the menu options.
3.
Use the
ARROW KEYS
to edit values. Press
ENTER
to save the settings. If a value is outside of
the acceptable range, “Err” will be displayed and the value will not be accepted.
To exit the configuration mode and return to measurement mode, press
CONF
,
ENTER
at any time.
Configure the transmitter for ORP sensors
The transmitter has default settings for use with pH sensors. For use with an ORP sensor:
1.
Select the "out.1MNU" configuration menu.
2.
Change the sensor type from pH to ORP.
a.
Press
CONF
,
ENTER
. Input passcode
1200
and press
ENTER
.
b
Use the
RIGHT ARROW KEY
to change from pH to ORP under the "01.UniT" display code.
Press
ENTER
.
c
Press
CONF
,
ENTER
to exit configuration mode.
Configure the pH buffer
For accurate pH calibration, configure the correct manufacturer of pH buffers. Calibration is rarely
performed at exactly 25 °C, and different pH buffers can exhibit different temperature dependencies.
3.
Press
CONF
,
ENTER
. Input passcode
1200
and press
ENTER
.
4.
Select "CAL MNU".
5.
Select the appropriate code from
Table 3
.
Note:
If the buffer is not listed in
Table 3
, select manual entry (MAN). Enter the pH values when
prompted during calibration.
6.
Press
ENTER
. Press
CONF
,
ENTER
to exit configuration mode.
Table 1 Terminal assignments
Terminal No.
si792(x) P
si792x P-FF
si792x P-PA
14
(–)
(–)
(–)
15
(+)
(+)
(+)
Table 2 Terminal assignments—differential sensors
Terminal No. Assignment
Hach wire color
1
Measure electrode (pHD is Reference)
red
4
Reference electrode (pHD is Measure)
green
5
Cable shield connections (2 shield wires for
Hach pHD, 1 shield wire for Hach LCP)
Note:
Do not connect to earth ground.
shield
8
RTD (resistive temperature device)
yellow
17
–6 V
white
18
GND
black
Table 3 Calibration mode setup menu—CAL mnu
Select pH buffer set
–01–BUF
Knick/Mettler-Toledo
–02–BUF
Merck Titrisols, Riedel Fixanals
–03–BUF
Ciba (94)
–04–BUF
NIST technical buffers
–05–BUF
NIST standard buffers
–06–BUF
HACH buffers
–07–BUF
WTW technical buffers
–08–BUF
Hamilton Duracal
MAN (manual entry, for buffers not listed in this table)
DAT—Entry of offset and slope of premeasured electrodes
