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Know - How of Gas Monitor |
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Gas Entry Hole |
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| Q: |
There is one small hole on each monitor, what is it for? |
| A: |
It is the gas entry hole. |
| Q: |
How to use the "Gas Entry Hole" on the CO2 monitor? |
| A: |
The CO2 monitor usually measures CO2 in diffusion from the gap holes on the housing. If CO2 is |
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pumped into the monitor, it has a faster response less than 30s (63% step change). Before taking a |
| measurement, please connect the CO2 monitor with a gas tube (outside diameter is about 3mm) into the |
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gas entry hole, and pump the gas in 0.1~0.2 liter/min, the CO2 monitor can show the accurate CO2 |
| concentration quickly. |
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Output |
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| ZG106 |
RJ45 8pin interface, OC: fixed set point, factory set at 1000ppm, 50ppm hysteresis. |
| ZG116 |
RJ45 8pin interface, OC: fixed set point, factory set at 1000ppm, 50ppm hysteresis. |
| ZG01 module |
| Digital: CO2 & Tamb in ZyAura Protocol. |
| OC: fixed set point, factory set at 1000ppm, 50ppm hysteresis. |
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| ZGw0806 |
RJ45 8pin interface, OC: fixed set point, factory set at 1000ppm, 50ppm hysteresis. |
| ZGw08PR |
Relay: 30VDC or 250VAC, max 2A, SPST Normally Open. |
| ZGw08VRC |
| Linear voltage: 0~10VDC; linear current loop: 4~20mA (max load: 500ohm). |
| Relay: 30VDC or 250VAC, max 2A, SPST Normally Open. |
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Can 4-20mA and 0-10V outputs work at the same time? |
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Yes, they can. |
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| ZG10U |
| AC/ DC: Voltage - 6VDC; Power - 1.8 W. |
| Relay: 30 VDC or 250 VAC, max 2A, SPST, Normally Open. |
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Power Supply |
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| ZG106 |
| Battery: Alkaline, AA* 4 (80 hours); External: 6VDC AC/DC adapter. |
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Why not use rechargeable batteries? |
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There is explosive risk and also it increases the cost. |
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| ZG116 |
6VDC AC/DC adapter |
| ZG01 module |
6VDC |
| ZGw0806 |
6VDC AC/DC adapter |
| ZGw08PR |
6VDC AC/DC adapter |
| ZGw08VRC |
| 18~26VAC or 18~36VDC in 0.3A (the terminal block can be connected to the wire box on |
| the wall for the HVAC system, then the 4~20mA and 0~10VDC output can work well to |
| control the ventilation fan. |
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| ZG10U |
| AC input: |
Voltage - 100 ~ 240VAC |
| AC input: |
Voltage - 100 ~ 240VAC |
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Frequency - 50 / 60Hz |
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Power requirement - |
1W maximum @ 115VAC 60Hz |
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2W maximum @ 231VAC 50Hz |
| Peak input current: 0.2A from 6VDC |
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Sensor |
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| Q: |
How long is the NDIR life? |
| A: |
We use dual channel(beam) NDIR (Non-Dispersive Infrared), thermopile from PerkinElmer, which |
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improves the long-term stability of the measurement; it has longer durability than single channel design |
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so the device has a durable life more than 5~10 years. |
| Q: |
How long is the Calibration Interval? |
| A: |
We recommend no shorter than 3 years (for regular consumer use because our yearly drift is around |
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15ppm only). |
| Q: |
What precautions we should take during calibration? |
| A: |
Please wait enough time before calibrating the CO2 monitor to make CO2 monitor reading stable. Don’t |
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breathe towards the CO2 monitor while you calibrate the CO2 monitor. |
| Q: |
In what way should sensor degradation & annual drift be considered? |
| A: |
In high temperature and high humidity, the annual drift indeed should be considered. One easy method to |
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check the accuracy is to use the ambient air as 400ppm CO2 to calibrate the CO2 monitor. The ZG106/ |
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ZG116/ ZGW0806 have such mode. |
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Data Logger |
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| Q: |
For Data Logger, the data is stored per 30 minutes into the number 1~48, which is the latest? |
| A: |
In ZG106/116, the DataLogger function stores 48 sets of CO2 concentration (CntR) and ambient |
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temperature (Tamb) in the past 24 hours. If the data set (CntR +Tamb) number exceeds 48, the earliest |
| data set will be replaced by the later data set in sequence automatically. The smallest number is the |
| latest data. (NO.1 record is always the latest one). |
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Accuracy |
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| ZG106 |
±50ppm or ±5% of reading, whichever is greater |
| ZG116 |
0~2,000ppm: ±70 ppm or ±5% of reading, whichever is greater; over 2000ppm: +/-7% |
| ZG01 module |
±50ppm or ±5% of reading, whichever is greater |
| ZGw0806 |
±50ppm or ±5% of reading, whichever is greater |
| ZGw08PR |
±75ppm or ±5% of reading, whichever is greater |
| ZGw08VRC |
±75ppm or ±5% of reading, whichever is greater |
| ZG10U |
±100ppm or ±5% of reading, whichever is greater |
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Other |
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| Q: |
What is "Accuracy"? |
| A: |
It is describing the deviation from the real concentration or error. i.e. deviation between average reading |
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and real concentration. |
| Q: |
What is Repeatability? |
| A: |
It is describing the stability of the reading, standard deviation of 16 measurements is the usual method. |
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20ppm is the stability at 400ppm. |
| Q: |
What does "Response time: <2min for 63% of step change" mean? |
| A: |
While you put CO2 monitor from one room (CO2 concentration is C0) suddenly into another room (with |
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different CO2 concentration as C1), the CO2 monitor will spend about 2mins to reach this reading: {C0 + |
| 0.63*(C1-C0)}. |
| Q: |
Is it possible to connect the IR CO2 module sensor to an input flow of gas and to have an output gas |
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flow from the IR CO2 module sensor? |
| A: |
It means pressure compensation. Pressure change causes CO2 reading drift. Usually we have the |
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pressure compensation of 0.13% by the actual air pressure to avoid of such drift. |
| Q: |
It is possible to connect the IR CO2 module sensor to an input flow of gas and to have an output gas |
| flow from the IR CO2 module sensor? |
| A: |
There is one AirFitting (Cu connection), which can connect as the input flow of gas. For output gas flow, |
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we need to add another AirFitting on the AirCell(AlCell) for your special application. If you need another |
| AirFitting, that will need special cost because we need to customize the AirCell for you. Or you can |
| connect from the gas hole on the AirCell by yourself. |
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