Types of Recorders

Flatbed Recorders are designed for easy transportability. Use them on the benchtop to perform short-term monitoring. These recorders normally record less than five channels at a time and do not have spools or trays to collect recorded paper.

Modular Recorders offer the flexibility of using the same recorder for different types of inputs by simply changing the input module. Installing the module is easy—just slide it into the guide rails of the recorder.

Safety cabinets provide a convenient and secure means of storage for flammables, corrosives, acids, paints, and ink.

To properly assess your storage needs,you must determine the quantity and class of the chemicals you need to house, and ascertain whether they have any special storage requirements. Refer to the Material Safety Data Sheet or container label for the specific requirements of each chemical. Additional guidlines on storing hazardous materials are available from your local fire marshall or OSHA office. These regulations will help determine the size and type of storage cabinet you require.

Selecting a Filter

1. Determine the particle size to be retained or filtered. Membranes will retain all particles equal to, and then larger than their designated pore size.

2. Assess the chemical compatibility of the membrane filter with the liquid or gas to be filtered. Consider the chemical resistance properties of the all parts that will contact the filtrate.

3. Depending on the procedure performed, the membrane color or surface pattern may be important.

4. Also consider hydrophilic or hydrophobic membranes; temperature, flow rate, throughput, and sterilization needs.

Strainers—provide coarser filtration for removing dirt, debris, and particulates from your pipeline. They provide a great first stage filtration before utilizing finer filtration elements. For liquid filtration application only.

Liquid Cartridges—our diverse selection of double open end cartridges include autoclavable, bacteria inhibiting, resin-bonded, spun polypropylene, and pleated cartridge designs.

Introduction

Airflow measurement is a critical component when assessing an HVAC system. It helps ensure balance, energy efficiency and cost effectiveness of the system. The most effective way to test and verify these components is with airflow measurement instrumentation. These test instruments are called anemometers or thermoanemometers (if they measure temperature). Many anemometers measure airflow, air volume and temperature, while other parameters may include humidity, dew point, and static/differential pressure.

Metering pumps move precise volumes of liquid in a specified time period to provide accurate flow rates. This class of pumps moves liquids in two stages: the suction stroke and the discharge stroke. During the suction stroke, liquid is pulled into the pump cavity past the inlet check valve. During the discharge stroke, the inlet valve closes; the outlet valve opens, and the liquid is pushed out. Vary the flow either by changing the stroke length or by adjusting the cycle frequency. Described below are a few types of metering pumps listed in this catalog—bellows, diaphragm, and piston.

Considerations

Extend Your Thermocouples up to 2000 feet without signal loss. Extension wire must be the same type as the thermocouple.

System Error becomes important when you select a probe and meter to make a complete temperature measurement system. For example: a meter has an accuracy of ±0.7°F; from the probe-error limits table below, type T probes with metal sheaths, straight cables, and stripped ends have an error limit of ±1.8°F at 400°F. Therefore, the probe-meter system accuracy will be (±0.7) + (±1.8) = ±2.5°F at 400°F.

Use the "Tubing Selection Guide" below to help you select the appropriate tubing for your application. The Chemical Compatibility guide and the chemical resistance summary in the table below are only guidelines. Chemical resistance and tubing wear may vary according to use—always test the tubing you select under the actual conditions.

Glass thermometers are accurate, economical instruments that measure temperatures of liquid or gas. All of our glass thermometers conform to the International Temperature Scale of 1990 (ITS-90). All Ertco® brand thermometers have individual serial numbers. ASTM thermometers vary from 5.5- to 8-mm diameter; most other thermometers have a 6- to 7-mm diameter. For PTFE-coated or tapered thermometers, call our Application Specialists for ordering information.