Fuji Electric ZSS-8 Series Instruction Manual page 105

(6) "AI Under" alarm
1) Did you set the analog input to CH1 or CH2 while no sensor is connected to the AI terminal?
→ Set the analog input to the fixed value or connect the sensor to the AI terminal.
2) Did you set the channel corresponds to the AI terminal being used?
→ Check if the channel you set match the AI terminal number.
3) Is it 4–20 mA DC signal that is provided?
→ The analyzer accepts 4–20 mA DC signal only. Voltage input is not accepted.
4) The input signal is ≤-10% or ≥110% of the input range.
→ Check the input signal is within the allowable range.
(7) "Box Temp.Warning"
1) Are you using the analyzer in the environment beyond the specification?
→ Be sure to use it under the specified environment.
2) The gas temperature is beyond the allowable range.
→ See Appendix 1 for the sample gas requirements. If necessary, change the position of the analyzer or take other measures
so that the gas temperature falls within the allowable range.
3) The air purge flow rate is deficient.
→ Increase the flow rate.
4) In other cases, contact us because some measures need to be taken such as extending the distance
from the stack to the analyzer.
(8) "Low Air Purge" alarm
1) Did you set the analog input to CH1 or CH2 while no sensor is connected to the AI terminal?
→ Set the analog input to the fixed value or connect the sensor to the AI terminal.
2) Is the air purge pressure lower than the alarm setting, or no purging air is provided.
→ Make sure the purging system is working and the air purge pressure is efficient.
(9) The analyzer does not work even when you turn on the power.
1) The supplied voltage is lower than the rating.
→ Supply the voltage at which the product is rated.
2) There is poor contact or disconnection of wire.
→ Check the wiring and cable connection.
3) In other cases, contact us because the analyzer may have failed.
(10) The measurement results differ from the manual analysis.
1) The setting of the optical path length is not correct.
→ Set the correct value for the stack length, i.e. optical path length, because it considerably affects the measurement re-
sults.
2) The actual gas temperature differs from the analog input for the gas temperature.
→ Modify the analog input setting so that the analyzer can calculate the concentration based on the correct gas temperature.
3) The actual gas pressure differs from the analog input for the gas pressure.
→ Modify the analog input setting so that the analyzer can calculate the concentration based on the correct gas pressure.
4) The light intensity is extremely low.
→ Adjust the light axis.
5) In NH3 analyzer: the sample gas contains a considerable amount of interference gas that has small
molecule weight (e.g. H
→ The pressure broadening compensation is required. Contact the distributor where you purchased the product or our sales
office.
6) In CH analyzer: The sample gas contains a considerable amount of H
4
→ The moisture compensation is required. Contact the distributor where you purchased the product or our sales office.
7) The measurement principle of the equipment you use for manual analysis is different from that of the
laser gas analyzer ZSS.
→ ZSS measures the concentration of a component in the state of gas, which means it cannot detect complex molecules or
dissolved molecules. Therefore, the measurement result of ZSS may be different from that of the analyzers using
ion-selective electrode or other principles.
8) The measurement points differs between ZSS and the manual analysis.
→ ZSS obtains the mean gas concentration over the stack diameter, while the manual analysis or a sampling system
measures the gas concentration at the center of the stack. When the gas concentration in a stack is uneven, therefore, the
measurement results of the above two differs each other.
9) Due to the difference in the measurement principle
→ZSS measures a specific component while the manual analysis and the ion-selective electrode may measure the ionized
matter as a whole. Therefore, if the sample gas contains other gas than the target of measurement, the measurement re-
sult of ZSS differs with that of the manual analysis or the ion-selective electrode.
INZ-TN8ZSS-E
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