Document ZBxXN7jpZ2G3Q95GMX49rdXXL

Instruments Illinois Testing Laboratories, Inc. 422 N. LaSalle Street, Chicago, Illinois TESTING ENGINEERS AND MANUFACTURERS "Alnor" Indicating Pyrometers--Portable and Stationary, "Alnor" Surface Temperature Pyrometers, "Alnor" Distant Reading Resistance Thermometers, "Alnor" Velometers (Boyle Type)--Air Velocity Meters. Instruments Leeds & Northrup Company General office and Worts: 4941' Stenton Avenue, Philadelphia, Pa. Chicago St. Lotus Boston Lob Angeles San Francisco Branch Offices: Cleveland Pittsburgh Houston Detroit Tuusa RUGGED, NULL-TYPE INSTRUMENTS THAT ARE RELIABLE . . _. _ Fig. 1--Showing Tube Type Velometer with No. 5 Angle Jet taking air velocity of grille Fig. --Showing Tube Type Vdometer with Duet Jet taking readings directly in the duct. Duct Jet furnished 18 in. or 86 in. long "ALNOR" (BOYLE TYPE) VELOMETER The Instantaneous Direct Reading Air Velocity Meter The Velometer is a direct reading instrument which gives accurate and instantaneous readings of the speed of air measured in feet per minute. The indicator or meter is housed in an attractive black Bakelite case 5A in. x in. x 2% in. and weighs approximately 2 lb. The air which enters the meter actuates a movement comprising a swinging vane, control hair springs, pointer and a magnetic damping system. No mathematical calculations or stop watches are necessary to determine the velocity reading as the pointer indications are a direct measurement of air speed. While the Velometer is offered in three types, the Tube Type is by far the most popular. This type uses attachments called jets for most of the velocity readings. The style of jet to be used depends on the requirements or purpose for which it is used. No. 2215 Averaging Jet--This jet is offered for obtaining velocities of ordinary duct openings or grilles. With this jet, average velocity readings over a 4 in. circle can be quickly obtained. No. 2220 and No. 2240 Jets--These jets, angle and straight have small orifices to give spot velocities over a Ai in. diame ter. The Velometer with these jets pro vides accurate spot velocity readings of irregular shaped or slotted openings or other small velocity streams, locates leaks in duct systems and other similar service that would be difficult by other means. No. 2425 Duct Jets 18 In. and 36 In. Long--These jets are offered for direct velocity readings in ducts. The Duct Jet is, in effect, a double jet using two tubes and two meter fittings. With this jet, static pressure is balanced out or sub tracted from total pressure and the net result or velocity pressure is read directly on the scale of the Velometer in feet per minute. Thus no calculations are neces sary. Inch marks are provided on the jet for the convenience of the user. No. 2460 Static Pressure Jet--This jet provides direct readings of static pressures of ducts, plenum chambers or pipes in inches of water. No. 2485 Total Pressure Jet--This jet gives direct readings of total pressure, in inches of water. Inch marks are provided on this jet to enable the user to place the jet at the desired distance in the duct. Other Jets--Other varieties of jets are available for special applications, but in general, the jets described above will enable the user to check and balance a complete air duct system of any size. The Velometer will be found indispen sable by any heating, ventilating or air conditioning engineer or contractor or manufacturer of equipment. Write for Complete Folder 986 Model S Micromax Recorder Becords from l to 16 points on a single stripchart. Extremely open record. Can operate signals. (About 1/15 size) Model R Micromax Recorder Records 1 or 8 points on a roundchart. Bos extremely readable dial. Can operate signals. (About i/15th size) Switchboard Indicator Hand-operated. Can be connected through selector switches to any number_ of points. (About UlOth size) Electrical Thermometers for Air Conditioning No method for measuring temperatures fits the specific needs of air conditioning as does the three-lead null-type resistance thermometer method. It is independent of distance and disregards all tempera tures except those right at detector loca tions. The detectors (resistance thermo meter bulbs called Thermohms), can be placed anywhere--in rooms, air ducts or water lines. They are connected by simple electrical wiring to instruments at a central location. Instruments may be: Micromax Recorders, Model S for up to sixteen Thermohms; Micromax Model R, for related pairs such as wet and dry bulb; indicators with switches for any number of Thermohms; or indicating and recording combinations. This equipment is fundamentally re liable. Instruments and Thermohms are highly responsive, yet rugged in construc tion. A complete system is easy and economical to install, regardless of dis tances. It is easy to operate and demands minimum maintenance. Thermohms and instruments are interchangeable, and can be replaced without disturbing wiring or returning anything to the factory. L&N Resistance Thermometers make it possible to operate efficiently; to main tain comfort or correct process atmosphere constantly ... so that maximum return is realized on the entire conditioning invest ment. J-225a(2) Electrical Instruments for the Heating Plant The facts needed to operate a modern heating plant so as to save fuel, to protect equipment, and to operate efficiently at varying loads are provided reliably by rugged L&N instruments. Readings can be indicated or recorded or both. Re corders can be equipped to operate signals or alarms that warn the operator of extreme conditions. In some cases the instruments control automatically. Microraax Model S provides a per manent record of conditions at from 1 to 16 points on one wide-scale chart. Micro max Model R concentrates on conditions at one point, provides a permanent record, and has a giant indicating dial that can be read at a glance. The switchboard in dicator provides intermittent checks on conditions at one or several points. In the heating plant, L&N measuring, signalling or controlling equipment is used for: Metermax Combustion Control. Furnace Pressure Control. Smoke Density Analysis. __ Flue Gas Analysis (Percent CO,). Flue Gas Temperatures. Steam and Water Temperatures. Boiler-Furnace Temperatures. Electrolytic Conductivity of Water. Percent Leakage of Cooling Water.