horiba APOA-370 - User Manual

Questions and Answers

M
Mary WalkerAug 20, 2025
Why is the output signal level too low in my horiba APOA-370?
- S
  Susan LeonAug 20, 2025
  If the output signal level of your Horiba Measuring Instruments is too low, it might be due to several reasons. First, ensure that the range is set correctly or select the automatic range. Also, inaccurate zero or span calibrations can cause this issue, so perform these calibrations again. Other potential causes include deteriorated DO unit performance (replace the catalyst), a malfunctioning SV unit (replace the SV unit), pressure loss in the sample inlet or outlet (check and rectify the piping), or a contaminated filter (replace the filter every 2 weeks).
R
Reginald BrownAug 22, 2025
Why is the output signal level too high in my horiba APOA-370 Measuring Instruments?
- M
  Melissa WalkerAug 22, 2025
  If the output signal level of your Horiba Measuring Instruments is too high, it could be due to an improperly set range. Try setting the range correctly or selecting the automatic range. Also, inaccurate zero and span calibrations can lead to this problem, so repeat the calibration procedures.
E
Erica BakerAug 25, 2025
What to do if the readings are not stable enough on Horiba Measuring Instruments?
- J
  John AndersonAug 25, 2025
  If the readings from your Horiba Measuring Instruments are not stable enough, it could be due to an unstable flow rate. Check the filter and replace it if it's contaminated; the filter should be replaced every 2 weeks. Another possible cause is pressure loss in the sample inlet or outlet. In this case, rectify the piping for the sample inlet and outlet.
S
Suzanne WrightAug 26, 2025
Why is the noise level too high on my horiba APOA-370 Measuring Instruments?
- J
  Jack ClarkAug 26, 2025
  If your Horiba Measuring Instruments has a high noise level, it could be due to condensation inside the instrument. Allow the instrument to stand in a stable temperature environment within the operating range until the condensation disappears. Other potential causes include low lamp light intensity (replace the lamp) or a malfunctioning SV unit (replace the SV unit).
C
Chase JacksonAug 28, 2025
How to fix zero calibration issues on horiba APOA-370?
- C
  Courtney SmithAug 28, 2025
  To fix zero calibration issues on your Horiba Measuring Instruments, repeat the zero calibration. Ensure that only zero gas is supplied during the calibration process.
L
Lindsey RodriguezAug 29, 2025
How to resolve span calibration problems with horiba APOA-370 Measuring Instruments?
- A
  aosbornAug 29, 2025
  To resolve span calibration problems with your Horiba Measuring Instruments, first, perform the span calibration again. Ensure the span gas concentration is correct and set properly before calibrating.
P
Patricia McdanielAug 31, 2025
What to do if I see a 'Deozonizer temperature' error on my horiba APOA-370 Measuring Instruments?
- H
  Heather KelleySep 1, 2025
  If your Horiba Measuring Instruments is showing a 'Deozonizer temperature' error, it might not have warmed up sufficiently. Allow the instrument to warm up. Also, ensure the ambient temperature is within the specified range of 5°C to 40°C. If not, let the instrument sit in an environment within this range for a while.
K
kimberlycunninghamSep 2, 2025
What to do if the lamp does not turn ON in my Horiba Measuring Instruments?
- J
  joshua34Sep 2, 2025
  If the lamp in your Horiba Measuring Instruments does not turn ON, and there's no lamp signal on the MAINTENANCE and ANALOG INPUT screens, you should replace the lamp.
C
Christopher CoffeySep 4, 2025
What to do if no output signal is available from horiba APOA-370?
- B
  Brandi AndersonSep 4, 2025
  If your Horiba Measuring Instruments is not providing an output signal, check the measured gas line and calibration gas line for disconnected piping, because the flow rate may be too low. Also, ensure that all connectors are properly connected.
T
Tyler SmithSep 6, 2025
What does it mean when my horiba APOA-370 Measuring Instruments displays a 'Light intensity' problem?
- M
  Michael BarnesSep 6, 2025
  If your Horiba Measuring Instruments displays a 'Light intensity' problem, it indicates that the light intensity of the lamp is too low. Replace the lamp to resolve this issue.

horiba APOA-370 Specifications

General

Repeatability	±1% FS
Operating Temperature Range	5 to 40 °C
Dimensions	430(W) x 450(D) x 132(H) mm
Weight	Approx. 13 kg
Measurement Range	0-5/10/20/50/100/200/500/1000 ppm or 0-1/2 %FS
Linearity	±1% FS
Response Time	Within 60 seconds (90% response)
Sample Gas Flow Rate	0.5-1.0 L/min
Sample Flow Rate	0.5 to 1.0 L/min
Output Signal	4-20 mA DC
Measurement Method	Cross flow modulation non-dispersive infrared absorption method
Measurement Principle	Cross flow modulation non-dispersive infrared absorption method