Environmental testing, A sample application, A sample application: environmental testing – Watlow Series F4S/D User Manual

Page 40: Programming a profile, Military standard 810d

To test its customers’ navigational equipment,

Ajax Testing Co. selected a version of Military Standard

Test 810D, which is often used to test navigational or

other military equipment under hot, humid conditions.

The full test requires a two-channel controller to manipu-

late both temperature and humidity in an environmental

chamber.

Andy planned his profile on the User Profile
Record,

after checking the Setup Page to make sure the con-

troller’s inputs, outputs, limits and ranges were config-

ured properly. Andy then programmed the profile into the

Series F4.

4 . 8

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P r o f i l e P r o g r a m m i n g

Wa t l o w S e r i e s F 4 S / D

A Sample Application: Environmental Testing

Programming a Profile

F 4

Main Page___________

Go to Profiles

Go to Setup
Go to Factory

This profile is embedded in the Series F4

software for use as a teaching tool and as

a template. To see how it is programmed

in steps, and how each step is defined, go

to the Profiles Page, choose Edit Profile

and open MILSTD 810D.
If your Series F4 is a single-channel con-

troller, you will see only the temperature

on Channel 1. This is NOT the true Mili-

tary Standard Test 810D.

Military Standard 810D

Step 1:

Ramp Time

Initialize the set point for channels 1 and 2.

Step 2:

Soak

Wait for channels 1 and 2 process values to reach their set points before the test
proceeds.

Step 3:

Soak

To ensure that the equipment temperature has stabilized, expose the equipment
in the chamber to a temperature of 88°F and an RH of 88% for five hours.

Steps 4 to 11: Ramp Time

The test calls for a programmed increase in temperature and decrease in relative
humidity over a period of eight hours.

Step 12:

Soak

Expose the equipment in the chamber to a temperature of 105°F and an RH of
59% for three hours.

Steps 13 to 19: Ramp Time

The test calls for a programmed decrease in temperature and increase in relative
humidity over a period of seven hours.

Step 20:

Jump

Jump to step 3 and repeat steps 3 to 20 twenty times.

Step 21:

End

End the profile and turn off all outputs.