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front and back slotted air openings (see Section 5.5),should be avoided. Such large <br /> intensity transients may cause erroneous readings. Direct access of sunlight to the <br /> sensing chamber should be prevented. <br /> Typical modes of instrument support/handling include: <br /> • Hand-held.Do not obstruct or cover the sensing chamber opening slots on front <br /> and back of unit. <br /> • Belt attached. Use belt clip provided as standard accessory.The unit can be <br /> worn <br /> on a waist belt, or with optional shoulder belt(model pDR-SS) for breathing <br /> zone monitoring. <br /> • Table top operation. The pDR-1000AN can be placed on a table either in an <br /> upright position(i.e., resting on its lower protective bumper),or on its back (i.e., <br /> resting on the rear edges of its two protective bumpers). <br /> • Tripod mounted. The unit can be attached to any standard tripod using the <br /> threaded bushing on the bottom of the monitor (see Figure 3). <br /> • Fixed point operation.The model pDR-1000AN can be mounted at a fixed <br /> location (e.g.,wall or post) using the optional wall mounting bracket,model <br /> pDR-WB. <br /> 3.3.2 Model pDR-1200 <br /> The pDR-1200 requires an external air suction device,such as a small diaphragm <br /> pump (e.g.,model pDR-PU) for its sampling operation. The inlet of the pump must <br /> be connected by means of tubing to the hose fitting on the pDR-1200 filter holder <br /> attached to sensing chamber (see Figure 2). <br /> The inlet metal tube of the cyclone can be oriented in any desired direction (i.e., <br /> upward,forward, downward or backward)by rotating the cyclone body within its <br /> holder cup on the right side of the sensing chamber(see Figure 2). <br /> Always ensure unobstructed access to the cyclone inlet when sampling directly the <br /> air in the instrument's vicinity. Alternatively,tubing can be connected to the <br /> cyclone inlet in order to extract a sample stream from a duct, chamber or other <br /> enclosed volume. <br /> Typical modes of instrument support/handling include: <br /> • Hand-held. For example,using a personal type pump, clipped to the belt <br /> and using a tubing connection to the pDR-1200. <br /> • Belt attached. Use belt clip kit provided as standard accessory.The unit can be <br /> worn on a waist belt, or with the optional shoulder belt(model pDR-SS)for <br /> breathing zone monitoring. A personal pump can then be belt-worn as well. <br /> • Table top operation. The pDR-1200 can be placed on a table either in an <br /> upright position(i.e. resting on its lower protective bumper), or on its back (i.e. <br /> resting on its backside). <br /> • Tripod mounted. The unit can be attached to any standard tripod using the <br /> 7 <br />