TSM, T, SM, & S
Blanket Testers

Automatic Testing rubber blankets
Up to 40,000V AC, 100,000V DC or both
Allows Testing to ASTM D1048 and F479 Standards

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The TSM Series is The VON Corporation’s fully automated blanket test solution. Units allow testing of all standard rubber blankets, even class IV. Tests are timed and an audible alarm sounds failures or test complete, with bright flashing colored lights signaling which position failed or test complete. The T Series is similar to the TSM but each position has independent controls and it’s own high voltage supply. The SM and S series are designed to be slaved to another tester’s high voltage supply.

CAPACITY: The TSM four drawer machine and T series one drawer machine will automatically and simultaneously test one to four (T series limited to one) insulated blankets at voltages to 40,000 volts A.C. of 70kV DC The SM and S series one to four drawer machines will provide the same tests when slaved to a master rubber goods testing machine, dependent on that master’s high voltage capabilities. These machines are capable of testing blankets as large as 46" x 46". With the proper electrodes all standard insulating rubber protective blankets may be tested in accordance with the latest ASTM D1048 and F479 standards.

VOLTAGE: The input voltage is 120/240 or 120/208 volts 60 hertz A.C. single phase. High voltage supply in the SM and S series is dependent on the master unit they are connected to. The TSM series’ 0-50,000 volts A.C. test voltage is provided by a 12kva continuous duty transformer. An optional 18kva transformer is available in the TSM for testing insulated bucket liners. The T series0-40,000 volts A.C. test voltage is provided by a 3kva continuous duty transformer. An optional 0-100,000 volt D.C. supply with manual transfer switch for changing between the high voltage supplies is also available. The test voltage is measured by means of a resistive divider connected directly across the high voltage circuit. Meter ranges of 0-20,000 volts A.C. and 0-50,000 volts A.C. are provided. The test voltage is raised and lowered with a motor driven variable autotransformer at a rate of approximately 1 kilovolt A.C. a second.

CURRENT: The current in each blanket being tested is continuously monitored with its own current meter with scale 0-100 milliamps A.C. This assures the operator that each blanket is being tested.

VENTILATION: One 1600 cfm exhaust fan is provided in the top rear of the blanket testing cabinet to remove ozone.

ENCLOSURE: The TSM series consists of two cabinets that are bolted together. The blanket testing cabinet with four drawers for testing four blankets is 56" wide x 79" tall x 60" deep. The power supply and control cabinet is 25" wide x 79" tall x 50" deep. Each T series unit is a single cabinet 56” wide x 81” deep x 16” high. S and SM series units vary depending on number of drawers.

CONTROLS: Controls are provided on TSM, T and S series units to perform the following from the front control panel.
a.   Set the test voltage from 1-50,000 volts A.C.
b.   Reset all flashing indicators and start the test. (The test duration can be set between 5 seconds and 20 minutes on the rear of the access door to the power supply and control cabinet.)
c.   Turn off the audible indicator and stop the test at any time before it is completed.
d.   Turn exhaust fans off, on continuously, or on just during the high voltage cycle.
e.   Bypass automatic high voltage cycle to permit manually raising the voltage with a push button, manually timing of the test, and manually lowering the voltage with a push button.
f.   Turn off all power to unit except for 24 volt interlock circuit. Nuisance tripping of the power source circuit when turning the unit on is eliminated by an input surge limiter on the variable autotransformer.

INDICATORS: All pilot light indicators operate in a fail safe mode by being lighted at all times and flash when indicating. A red "HIGH VOLTAGE FAILURE" light and a green "TEST COMPLETE" light are provided at each drawer position. TSM, T and S series units have a red "HIGH VOLTAGE FAILURE" light, an amber "HIGH VOLTAGE THIS POSITION" light, an amber "VARIABLE NOT DOWN" light, and a green "TEST COMPLETE" light are provided on the control panel.

OPERATION: A blanket is loaded into each drawer to be tested. The top electrode in each drawer is lowered into position when its toggle switch is turned to the "TEST" position. The operator pushes the "START" button. From one to four blankets as selected by the operator will be simultaneously tested.

The automatic high voltage cycle includes raising and lowering the voltage to the setpoint with the motor driven variable
autotransformer feeding the high voltage supply, automatic timing of the test, and automatic visual and audible indication of blanket pass or fail. A blanket which fails will stop the test, cause a steady audible signal, indicate which drawer has failed, and return the variable autotransformer to its zero position.

The surface of the blanket testing drawer is made of ozone resistant plastic with a non-tracking coating. This permits both the top and bottom electrodes to be the similar size so that the maximum area of the blanket can be tested. The aluminum electrodes are held in
position by locating pins. The drawer is the grounded electrode. The high voltage electrode is mounted on a movable insulating frame. One size of electrode is provided with each drawer. Unless specified electrodes are provided for testing 36" x 36" blankets rated Class I to Class III. For other sizes and ratings please specify the blanket size, shape, and voltage class. Additional electrodes
are available for each drawer.

The VON Corporation, P.O. Box 110096, 1038 Lomb Avenue SW Birmingham, AL 35211 (205)788-2437