Limit Comparator for Calibration Verification of Dual-Wire Continuous Monitors - Desco 50524

A continuous monitor only protects if its limits are right. The 50524 limit comparator verifies Desco dual-wire monitors at the workstation without removing them. Its stereo plug goes into the monitor's operator jack, and the rotary switch applies resistances just below and above the limits, for example 1.91 megohms LOW/PASS and 10 megohms PASS/HIGH. The monitor must respond with the correct LED and alarm each time.

Key benefits

• NIST traceable calibration check in a few minutes, virtually no downtime
• Fixed resistance steps for low and high limits (including 1.91, 10 and 35 megohms)
• Two vacant switch positions for custom limits with user-installed resistors
• Tests both operator channels of the same monitor in turn
• Compact handheld unit for use on the shop floor

Applications

Periodic function and calibration checks of dual-wire continuous monitors at ESD workstations. Desco generally recommends annual calibration, depending on the risk of the items handled.