From: Instruction Manual for the Collins Survey Spirometer, Manual No. 22168, Third Printing May 1981.
“1.A. DESCRIPTION
“A.1. The Survey Spirometer is a precision, calibrated, water-seal spirometer which may be used for the performance of ventilation tests.
“A.2. Figure 1 shows the basic equipment layout with all the major components identified. The spirometer body is constructed of copper while a rugged cast aluminum base supports the unit. Lightweight plastic is used for the spirometer bell.
“1.B. MECHANICAL SPECIFICATIONS
“B.1. Dimensions
“Length: 16-18”
“Width: 12”
“Height: 20”
“Shipping Weight: 32 pounds.
“Net Weight: 16 pounds.
“Water capacity: 1 quart, approximately.
“B.2. Spirometer Performance Specifications:
“Kymograph: single speed, 1920 mm/min.
“Spirometer capacity: 8 liters.
“Response: +/- 1% 0-140 CPM.
“Calibration Accuracy: +/- 1% for life of bell.
“Safety: UL Listed 544”