Model 106-H Ozone Monitor Manual Rev. D-2
18
3.16 Collecting Data from the Analog Output
The data may be logged in real time using a data logger attached to the D9 connector
on the back panel of the instrument using either a voltage or current recorder or data
logger. The 0-2.5 V output is measured across pins #1 (+) and #5 (ground). The 4-20
mA current output is measured across pins #9 (+) and #5 (ground). Looking at the
back of the instrument, the pin numbers for the connector are:
To change the analog output voltage scaling factor, go to
Menu / Admin / Cfg / I
/
O /
Ext / VOUT
. The display will briefly read “VOUT Menu” followed by
2.5V=20.00 vol%
20mA=20.00
In this example, the output scaling factor is set as 2.5 Volt (full scale) = 20 vol%; i.e., 1
Volt = 8 vol%. Also, the current output will be scaled such that the full scale of 20 mA
corresponds to 20 vol% O
2
. A reading of zero ozone concentration will be output as 0
V and as 4 mA. You can use the select switch to change the scaling factor to the
value of your choice by selecting (press in) and changing (by scrolling) the individual
digits in the scaling factor of either the voltage or current. Thus, the instrument is not
limited to a fixed number of “ranges” common to most ozone monitors. Instead, any
range can be defined.
3.17 To Read the Number of Hours of Ozone Monitor Use
The instrument keeps track of the total number of hours of use. This is helpful for
determining when the instrument should be serviced, calibrated, etc. To read the
number of hours of operation choose
Menu / Admin / Cfg / I
/
O / Hrs
.
3.18 Using and Setting the Relay Limits
The Ozone Monitor may be used to control other devices, such as ozone generators,
using two 12-amp relays located on the back of the instrument.
REL1
(the bottom
relay) may be used for ozone set points, for example to set limits for high levels of
ozone.
REL2
(the top relay) may be used for a second set of ozone set points (for
example, in the low ozone range), or instead could be used for diagnostics such as
temperature, pressure, flow rate, or lamp voltage (accessed via the serial menu,
Section 3.15).
To set the On and Off ozone limits of a relay from the LCD display, choose
REL1
or
REL2
from the
Admin / Cfg / I/O / Ext
submenu. The menu will show, for example:
On =04.90
wt% O2
Off=05.10
1 2 3 4 5
9
8
7
6
