Fluke Biomedical 859A-1-72 - Manual (Page 5)

Introduction 1
1-1
Section 1
Introduction
1.1 General Description
The Victoreen Model 859A-1-72 Controller is designed to be used in a process flow, radiation-monitoring
channel. Refer to figure 1-1 for a general view of the controller, or to Appendix A for all applicable
drawings.
The 859A-1-72 controller drives the stepping motor in an 859-1-50 Continuous Filter Air Sampler, which
determines the filter speed. Two methods are used by the controller to set filter speed. In the first
method, a rotary switch in the controller energizes the controller’s internal circuitry and sets the filter
speed at 0.5, 1, 2, or 10 inches per hour. The second method involves removing a jumper wire in the
controller, and allowing an external pulse to determine the filter speed.
The controller contains a power supply, motor driver circuit board, filter speed circuitry, and fast advance
circuitry.
The controller is built into a NEMA 12 enclosure and has four mounting brackets in a rectangular
configuration.
1.2 Specifications
General specifications are shown below.
Dimensions (H x W x D)
16 in. x 12 in. x 6 in.
(40.64cm x 30.48cm x 15.24cm)
Weight 25 lb. (11.3kg)
Enclosure NEMA 12
Operating Temp. 32
°F to 130°F (0°C to 50°C)
Relative Humidity 0 to 95% non-condensing
Power Requirements 110 to 130 VAC, 50/60 Hz