RH and T calibration and adjustment using MI70 - HM70 - MI70 - RFL100

RFL100 User Guide

Document code
M211861EN
Revision
H
Language
English
Product
RFL100
Document type
User guide
  • Vaisala MI70 Measurement Indicator
  • Connection cable for MI70 Measurement Indicator (Vaisala item 219980SP)
  • Reference environments for the desired calibration and adjustment points

  • RFL100 data logger with the probe to be calibrated

Optional:

  • MI70-compatible reference probe and connection cable

You can calibrate and adjust the probe of your RFL100 data logger in 1 or 2 points using the MI70 indicator. You can also do the 1-point calibration so that you compare the reading of the probe to any MI70-compatible Vaisala probe that provides the same measurement parameter.

  1. Disconnect the probe from the data logger.
  2. Connect the probe to be calibrated to port I of the MI70 measurement indicator using the connection cable.
  3. If you want to calibrate by comparing to the reading of a reference probe, connect it to port II of the MI70 indicator.
  4. Turn on the MI70 indicator.
  5. Start the adjustment sequence from Main menu > Functions > Adjustments.
    If you have 2 probes connected, make sure to start the adjustment sequence for probe I.
  6. MI70 notifies you that automatic power off is disabled during adjustment mode, select OK to acknowledge.
  7. Select RH or T parameter for adjustment and select OK. This procedure assumes you are adjusting relative humidity, but the same principles apply for temperature adjustment.
  8. Insert the probe to be calibrated in the reference environment. If you are calibrating relative humidity using 2 reference environments, use the dry reference first. If you have a reference probe, insert that in the same environment.
    If you are comparing against the reading of a reference probe, you can also use the ambient condition as the reference environment, as long as its conditions are stable.
  9. Wait for the measurement to stabilize. You can follow the stabilization from the GRAPH display. Select ADJUST when the reading is stabilized in the reference.
  10. To perform the adjustment using 1 reference environment (1-point adjustment), perform these steps:
    1. Select 1-point adjustment > SELECT > OK.
    2. When the measurement is stable, select READY.
    3. Give the reference RH value by using the arrow buttons and select OK.
    4. To confirm the adjustment, select YES. If you select NO, you return to the adjustment mode display and no changes are made.
    5. Continue from 13.
  11. To perform the adjustment using 2 reference environments (2-point adjustment), perform these steps:
    1. Select 2-point adjustment > SELECT > OK.
    2. When the measurement is stable, select READY.
    3. Give the reference RH value by using the arrow buttons and select OK.
    4. Insert the probe to be calibrated in the second reference environment.
    5. When the measurement is stable, select READY.
    6. Give the reference RH value by using the arrow buttons and select OK.
    7. To confirm the adjustment, select YES. If you select NO, you return to the adjustment mode display and no changes are made.
    8. Continue from 13.
  12. To perform the adjustment using a reference probe, perform these steps:
    1. Select To same as RH[II].
    2. To confirm the adjustment, select YES. If you select NO, you return to the adjustment mode display and no changes are made.
  13. Calibration and adjustment is now completed. Select BACK to exit the adjustment mode and EXIT to return to the basic display.
  14. Disconnect the calibrated probe from the MI70 indicator.
  15. Reconnect the probe to the data logger.