SL1188P Ultrasonic transit-time flowmeter
Revision
：
2.0.0
Page
21
of
81
Keep the password in mind or recorded in a safe place or the instrument cannot be used.
5.8.
4~20mA Current Loop Verification
1
2
3
4
5
6
7
4-20mA +
4-20mA -
4-20mA+
Red
4-20mA-
Black
The 4~20mA current output connects to the 7-pin din jack on the panel. The color of cable core is red
（
4-20mA+
）
and black (4-20mA-). With an accuracy of 0.1%, The current output of the Flowmeter PORTABLE is fully
programmable and can be set to various output modes such as 4~20mA or 0~20mA. Use Window M55 to select
the output mode.
The max load of 4-20mA DC is 750
Ω
. Exercise care on polarity when connecting.
5.9.
Totalizer Pulse Output
Each time the Flowmeter reaches a unit flow, it may generate a Totalizer pulse output to a remote counter. To
configure the unit flow, please refer to Windows M32 and M33.
The Totalizer pulse output can be transmitted through OCT or a relay. So, it is necessary to configure OCT and the
relay accordingly.(Please refer to Window M78 and M79).
For example, if it is necessary to transmit the positive Totalizer pulse through a relay, and each pulse represents a
flow of 0.1m3, ; the configuration is as follows:
In Window M33, select Totalizer the flow unit
“
Cubic Meters (m3)
”
;
In Window M34, select the scale factor
“
x0.1
”
;
In Window M79, select
“
9. Positive Totalizer pulse output
”
;
ATTENTION
Make sure to select a suitable Totalizer pulse, since the output may be extended if it is too large.
If it is too small, the relay may activate too frequently and shorten its life. Furthermore, if it
operates too fast, it may generate a pulse loss error. Therefore, a rate of 1~60/minute is
recommended.
5.10.
Recover the Factory Default
If it is necessary to recover the factory default, press
Menu
3
7
keys after the above-mentioned characters
are displayed on the screen.
Generally, it is unnecessary to activate this function except during the initial installation.
5.11.
Analog Output Calibration
ATTENTION
Each Flowmeter has been calibrated before leaving factory. It is unnecessary to carry through
this step except when the current value (detected while calibrating the current loop) displayed in
Window M58 is not identical with the actual output current value.
