Portable Dissolved Oxygen Meter DOS-218
Foreword
Thank you for purchasing our Dissolved Oxygen Meter DOS-218. Our Dissolved Oxygen Meter can be directly measured at the sea level and dissolved oxygen in salt-free water. In addition, you can input salinity compensation and pressure compensation when measuring high mountains or salt water. At the same time, you can print directly with the printer through infrared connection. Please read this manual carefully before use. You will find that our dissolved oxygen meter is very easy to operate and it is also a cost-effective dissolved oxygen meter.
In the front of the meter is the connecting point of the measuring rod, and the right is the infrared output point. The two jacks on the right side of the meter are the RS232 output and the interface. Figure 2 shows the full display of the LCD. When powered on, the LCD panel will display full 3 seconds. This full display includes 5 different areas. The different functions are shown in detail as follows:
The upper digits on the upper right show dissolved oxygen units, percentages available are %, ppm, or mg/L. The line below shows pressure compensation in units of mmHg OKpa and salinity compensation units in PPT. Below the Figure 2 is a temperature display. The display in the lower right area is YMD and HMS. The top left display is HLD (remember the instantaneous reading value). MAX (large) MIN, AVG, READY, CAL. In the lower left corner, record the previous record for Rec. The number of pens is on the right side. 
"Location display
Automatic shut-down
In order to save battery life, the machine has an automatic shutdown function and its operating procedure is as follows:
When the machine is off, long press The key is greater than 1 second, know that Lcd shows Prn Po.o at this time enter the parameter correction mode, press 
or 
Make Po.o become P5.o, Lcd shows Aut and P5.o at this time, press ENTER or 
At this time, Aut becomes six groups of numbers, indicating a total of six groups of automatic shutdown time (minutes), 20, 30, 40, 60, 90, 120, available for selection. or Press to select the desired time and press ENTER or , then press Shutdown completes the setup procedure.
Milyk???X3?? -font-family: Arial; mso-font-kerning:0pt'> "Location display
All the keys are shown in Figure 3.
1. key
a. Switch machine
b. If you press and hold this button for longer than 1 second during power off, it will enter the change parameter mode. At this time, LCD displays Prn and Po.o.
2.MODE key
a. Change unit in normal mode %, ppm
b. Change parameter mode to change parameter
c. In the view record mode can read the record
3.CAL/Esc key
a. Press this key to enter calibration mode in normal measurement mode
b. Press this key when changing the parameter mode to leave the change parameter mode back to normal measurement mode
4.MEM key
a. This parameter is the change parameter when changing the parameter mode
b. Press this key to store time and measurement results in normal measurement mode. Press this key to flash 3 seconds to indicate that it is being stored. The machine can store 99 records in total.
5.DOWN key
Press this key at the time of power on to record the current range value temporarily, and press the key again to return to the original measurement mode. At the time of power-on measurement, press HOLD and ENTER at the same time to turn on the backlight for 10 seconds.
The HLD/Rec key temporarily records this reading when pressing this key in the measurement mode. Press the key again to return to the original measurement mode. Press Hold at the same time
Can turn on the backlight for 10 seconds Press this button for more than 1 second to enter the record mode 7.MN/MX/AV
a. Press this key to confirm and record the calibration or setting value
b. Press this key to view the size and average in viewing record mode
8.SET+HLD
In shutdown mode, long press the two keys for more than 1 second, the LCD displays ns1, then the meter will always be in the boot state until the battery is exhausted.
View record
In the normal measurement mode, if there are multiple records that need to be viewed, long press the Rec key for more than 1 second. At this time, Rec blinks in the lower left corner of the LCD. At this time, the record mode is entered. In this mode, press or You can check the original record, press the (MN/MX/AV) key to see the small value, press the second time to see the large value, and then press the times to see the average value. Press the REC button for more than 1 second to return to normal measurement mode.
Saturated dissolved oxygen correction
Normally, calibration must first be performed when using the unit for the first time. We recommend that you check the reading first when the unit is turned on. If the stable reading obtained after 15 minutes exceeds ±0.5%, correct the meter first.
*note*
1. Please immerse oxygen in pure water before calibration to get a good calibration result
2. Do not touch the semipermeable membrane in the process
The calibration procedure is as follows
a. In the normal measurement mode, place the electricity in the air, wait for a few minutes until the reading displayed on the LCD is stable, and then press the CAL/Esc key to correct the saturated dissolved oxygen. At this time, the CAL will flash straight.
b. Wait a few minutes, when the reading is stable, press The key completes the calibration procedure and the meter automatically corrects for saturated dissolved oxygen. Return to normal measurement mode.
c. If you want to stop the calibration during the calibration, press the CAL key while the CAL is flashing to return to the normal measurement mode.
d. If there is an error in the calibration, Err will be displayed on the LCD. This may be due to improper calibration. Please re-calibrate. If there is still a problem, it may be through the membrane, electrolyte or bad electricity.
Brand Gasketed Heat Exchanger Gasekts
Plate heat exchanger gaskets are a key component in the heat exchange equipment, the working temperature of the heat exchanger is also the bearing temperature of the gasket, and the working pressure is also limited by the gasket. The sealing gasket not only seals the heat exchange medium, so that it does not leak out, but also prevents materials from mixing with each other.
Because of its compact size, high heat exchange efficiency, energy saving and emission reduction advantages, Brand Gasketed Heat Exchanger gasekts are widely used in district heating, domestic hot water heating, floor heating, pool heating, building air conditioning, regional refrigeration, data center and electronic semiconductor and other fields.
Plate heat exchanger plate gaskets fixed form:
Under normal circumstances, the fixed form of the gasket is divided into paste type, Mosaic type and snap type. The sealing gasket and sealing groove of the plate heat exchanger must be completely consistent to achieve the sealing effect.
Brand Gasketed Heat Exchanger Gasekts,Plate Heat Exchanger Gaskets,Flat Rubber Plate Heat Exchanger Gaskets
Jiangsu Baode Heat-Exchanger Equipment Co.,LTD , https://www.baodehex.com