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Instructions for replacing the ATMOS 41 rain funnel and pyranometer

Instructions for replacing the ATMOS 41 rain funnel and pyranometer

Use these instructions to install a replacement funnel and pyranometer for the ATMOS 41 All-in-One Weather Station.

What you will need 

  • ZL6, EM60, ProCheck, or Campbell Scientific data logger capable of issuing SDI-12 extended commands
  • Cable to connect laptop to data acquisition device
  • Laptop with software installed:
    • Zentra Utility software if using ZL6 or EM60G
    • TeraTerm software if using ProCheck
    • LoggerNet software if using Campbell Scientific logger
    • Driver for USB cable adapter (if applicable)
  • Clean plastic/nitrile gloves
  • New rain funnel with pyranometer

PN 30414* – ATMOS 41 funnel with pyranometer (PYR) solar sensor installed

*This part number is for the rain funnel model with waterproof connector and strain relief cable (serial number newer than ATM-410002462). If an older model is needed, please request the older style from Customer Support.

Rain funnel with waterproof connector and cable strain relief

Older model

Installation procedure

  1. Unplug the ATMOS 41 from the data logger.

2. Discharge static electricity from body by touching any conductive material not isolated from the ground (e.g., metal pole).

NOTE: An electrostatic discharge (ESD) can damage ATMOS 41 electronics.

3. Wearing gloves, press the rain funnel down to compress the internal spring, and twist counter-clockwise to unlock from the base.

4. Before removing the funnel completely, carefully disconnect the PYR from the ATMOS 41 base by de-mating the PYR connector.

Pyranometer connector

 

5. The old funnel can be discarded after the field visit.

6. Write down the calibration (Cal) factor for the new PYR/funnel, located on the inside of the funnel.

Calibration (Cal) factor for PYR sensor (5.84 W m-2 in the picture above)

 

7. Connect the new pyranometer cable. Note that the connector is keyed and will only mate if oriented correctly.

8. Install the rain funnel to the ATMOS 41 base by lining up the pegs on the inside of the funnel with the notches on the ATMOS, and turn clockwise. On modern ATMOS 41 designs, the gray lock symbol on the rain funnel should be lined up with the lock symbol molded into the ATMOS 41 base.  Make sure the cable doesn’t get pinched by the spring or interfere with the raindrop path to the gold electrodes.

The image below is an example of the cable interfering with the raindrop path.

9. Entering the pyranometer Cal Factor

a. Plug the ATMOS 41 into a ZL6, EM60, ProCheck, or Campbell Scientific data logger.

b. Connect and set up instructions for EM60G/ZL6

i. Connect data logger to computer with micro USB cable.

ii. Open ZENTRA Utility, and connect to the data logger.

iii. In ZENTRA Utility, select Digital Sensor Terminal from the Actions menu item.

iv. Select the correct sensor port, and send the ?I! Command.

013METER  ATM41  XXXATM-41000XXXX output should be returned when the SDI-12 address is 0.

v. To enter the new pyranometer Cal Factor, send the following command:

?Xc Y.YY! 

Where Y.YY is the new Cal Factor found inside the replacement funnel

0OK should be returned from the Digital Sensor Terminal

vi.  Enter ?Xc!

The new Cal Factor that you entered in the previous step should be returned from the Digital Sensor Terminal.

c. Connect and set up instructions for ProCheck

i. Connect ProCheck to computer with USB-to-RS 232 cable adapter.

ii. Open TeraTerm, and connect to the ProCheck.

-Select Serial

-Select the correct COM Port

-Select OK

iii. Click on Setup menu item, and select Terminal.

In the New-line area of the terminal setup dialog box, do the following

-Click on the dropdown box next to Receive, and select CR+LF.

-Leave Transmit set to CR.

-Click in the checkbox next to Local echo.

-Press OK on the Terminal setup dialog box.

iv. Type [ to enter the direct communication mode on the ProCheck when ATMOS 41 is connected.

-When sensor address is 0, the DDI string will look like a random string of characters (e.g., {&Q^Jy=) after entering the direct communication mode.

-Type ?I! to view sensor information.

When SDI-12 address is 0, the following output should be returned: 013METER  ATM41  XXXATM-41000XXXX 

v. To enter the new pyranometer Cal Factor, send the following command:

?Xc Y.YY!

where Y.YY  is the new Cal Factor found inside the replacement funnel

0OK should be returned from the Digital Sensor Terminal.

vi.  Enter ?Xc!

The new Cal Factor entered in the previous step should be returned from Tera Term.

d. Connect and set up instructions for Campbell Scientific data logger (Example uses CR300)

i. Click the Connect button on the LoggerNet toolbar to enter the connect screen in LoggerNet

ii. Click on Connect on the Connect Screen after selecting the correct data logger

iii. Click on Data Logger from the top menu bar.

iv. Click on Terminal Emulator.

v. Click the Open Terminal button at the bottom of the Terminal Emulator window

Make sure that the checkbox next to All Caps Mode is NOT checked.

 

vi. With the cursor in the Terminal Emulator window, press the Enter key a few times until a CR300> prompt appears.

vii. Type SDI12 next to the prompt, and press Enter.

NOTE: The data logger will exit this mode relatively quickly, so if you don’t receive a response, repeat Steps vi and vii again.

The data logger will respond with Enter Cx Port 1, 3, 5, or 7 or something similar.

viii. Enter the control port that the ATMOS 41 sensor is plugged into, and press Enter.

The data logger will respond with Entering SDI-12 Terminal

Sensors must be updated individually, so only ONE sensor may be connected to the communications port.

ix. Send the ?I! command, and press Enter.

When the SDI-12 address is 0, 013METER  ATM41  XXXATM-41000XXXX output should be returned.

x. To enter the new pyranometer Cal Factor, send the following command:

?Xc Y.YY! and press Enter

where Y.YY  is the new Cal Factor found inside the replacement funnel

Ok or No answer from sensor or SDI12 Failed should be returned from the Digital Sensor Terminal

xi. Enter ?Xc! and press Enter

The new Cal Factor entered in the previous step should be returned from the Digital Sensor Terminal.  If the value returned is different from the value entered, repeat steps x and xi.

10. Reconnect ATMOS 41 to the correct data logger and port.

11. Check the data and verify that the PYR is providing reasonable data.

12. Ensure that the engraved N is pointing toward True North.

13. Re-level ATMOS 41, ±2 degrees from (0,0).

 

METER Customer Support

support.environment@metergroup.com

+1-509-332-5600

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