Dissolved Oxygen meter
Measuring principle : The oxygen molecules diffused through the membrane are reduced to hydroxide ions (OH-) at the cathode.Silver is oxidized to silver ions (Ag+) at the anode (this forms a silv
- 型号： Dissolved Oxygen meter
Measuring principle :
The oxygen molecules diffused through the membrane are reduced to hydroxide ions (OH-) at the cathode.Silver is oxidized to silver ions (Ag+) at the anode (this forms a silver halogenide layer).A current flows due to the electron donation at the cathode and the electron acceptance at the anode.
Under constant conditions, this flow is proportional to the oxygen content of the medium. This current is converted in the transmitter and indicated on the display as an oxygen concentration in mg/l, μg/l, or Vol%, as a saturation index in % SAT or as an oxygen partial pressure in hPa.
Technical Features：
Measurement variables | Dissolved oxygen, saturation, oxygen partial pressure |
Measuring range | 0 - 20mg/L,0 - 200%,0 - 400hPa |
Resolution | 0.01mg/L,0.1%,1hPa |
Accuracy | ±1.5%FS |
Repetition | ±0.5%FS |
Temperature measurement type | NTC 10K/PT1000 |
Auto A/manual H Measuring range | -10 - 60℃ Resolution: 0.1℃ Correction accuracy: ±0.5℃ |
Output type | 4 - 20mA current transmission output |
Max.loop resistance | 750Ω |
Accuracy | 0.1%FS |
Output type | RS485 digital signal output |
Communication protocol | Standard MODBUS-RTU (customizable) |
Power supply | AC220V±10%,50Hz/60Hz (optional 24V±10%) |
Alarm relay | AC250V、3A |
Installation methods:
A. Dissolved oxygen transmitter
Open a 92.5 * 92.5(mm) installation hole on the instrument cabinet or installation panel (the dimension is 100*100*150mm). Insert the instrument into the installation hole and latch on the butterfly clasp, as shown below.
B. Dissolved oxygen sensor
Dissolved Oxygen Sensor Dissolved Oxygen Sensor
(Non-replaceable membrane head) (Replaceable membrane head)
Instrument wiring:
Wiring diagram
DO+: Dissolved oxygen electrode anode
DGND: Dissolved oxygen electrode shielded wire
DO-: Dissolved oxygen electrode cathode
TEMPA: temperature offset terminal A,NTC10K A and PT1000 A
TEMPB: temperature offset terminal B,NTC10K B and PT1000 B
TEMPC: temperature offset terminal C, temperature of PT1000 three-wire system and PT1000 two-wire system need to be short-circuited with TEMPB, NTC10K does not need to connect with TEMPC.
RS485(A+):RS485 communication interface A+
RS485(B-):RS485 communication interface BI(+):
4-20mA output port +
I(-):4-20mA output port -
HO: high alarm of normal open relay
HC: high alarm of normal close relay
COM: common port
LO: low alarm of normal open relay
LC: low alarm of normal close relay
COM: common port
220V L:AC220V fire wire
NC: null
220V N:AC220V zero wireLO: low alarm normally open relay
LC: low alarm normally closed relay
COM: common