Dial Thermometers use a helix coiled bimetallic strip located within the thermometer stem to measure temperature. Dial thermometers are calibrated to a known temperature by adjusting a hex nut located under the dial. Dial thermometers have a probe that is inserted into the material being measured with a dial and read from above.

Diaphragm seals are used in flexible barrier and diaphragm to isolate a pressure sensor from the process fluid. These are an isolation devices used to separate pressure instruments from the process media. It is attached directly to the instrument and remotely by using a capillary line. It is available in different materials such as welded, clamped and capsule diaphragm seals.

Diesel analyzer is designed for engineers to optimize the performance of diesel engines. It has an user friendly software for operation in Windows™ XP environment. The advantages of this system include reduced fuel consumption, engine balancing, tuning of ignition timing, overload protection and reduced emissions. Information about the engine's operation and condition is displayed both numerically and graphically in the user-friendly software.

Differential Cylinder Pressure Testers features include cylinders less than a 5.00 inch bore with a .040 diameter orifice that enable to determine the exact location and cause of the engine's efficiency loss. It locate worn and cracked rings, defective intake and exhaust valves, scored and cracked cylinders, leaky head gaskets, worn and stripped spark plug bushings.

Differential Pressure Data Logger is used in monitoring charged environments. It is also used in clean room applications This is connected to the two pressurized environments using 1/4″ hose. There are five measuring ranges. The data logger is in a noryl enclosure, battery powered for up to 10 years and have 12-bit resolution. It records up to 3000 pressure measurements. It is ideal for monitoring air duct velocity, testing and balancing HVAC systems, or verifying room pressure. Sampling rate is user selectable from 0.04 seconds to 8 hours with first-in first-out or fill-then-stop sampling options. Loggers can store up to 21,500 readings and operate totally independently from any external power supply with built-in lithium battery.

Differential Pressure Flow Transmitters measure the flow of many corrosive liquids, gases and vapors. Differential pressure flow transmitters are constructed of materials that do not contaminate the fluid. These DP flow transmitters offer several different methods of flow sampling.

Differential Pressure Flowmeters are known as head meters. The advantages of differential pressure flowmeters include simple construction, external transmitting instruments, low maintenance and ease of instrument & range selection. The disadvantages include low flow rate rangeability with normal instrumentation, The operation of differential pressure flowmeter is based on the concept that the pressure drop across the meter is proportional to the square of the flow. These flow meters use differential pressure to compute volumetric flow rates. It is commonly used for industrial applications.

Differential Pressure Gauges is a device used for measuring the difference between pressures acting on one of both sides of a pressure sensitive partition surface at the same time.

Differential Pressure Gauges are rugged industrial gauges, which indicate the difference between two input connections. Differential pressure gauges works on different types of sensing elements. These differential pressure gauges are mainly used in the application of filters or any other type of filtration systems.

Differential pressure indicator consists of an indicator element which has a magnet affixed to the lower end, the element being axially movable from a retracted non-indicating position to an extended indicating position. A spring-biased piston made of material which is not a permanent magnet but which is responsive to a magnetic field is axially movable in a fluid pressure chamber in response to changes in differential pressure. An increase in differential pressure causes the indicator element to move upwardly to a visual indicating position where its tip protrudes beyond the casing of the device.

Differential Pressure Indicator is used in jet engine & missile testing programs, aircraft ground support equipment, water treatment processes and air conditioning systems. These indicators are used and recommended for liquid level indication of materials such as LOX, helium, hydrogen, nitrogen, CO2 and argon.

Differential Pressure Switches monitor the change in the difference between two pressures. Differential pressure switches are used in applications to signal that a predetermined pressure difference is reached as a result of a widening or increasing difference between the two pressures. Differential pressure switches give the relative pressure between two points. Pressure switches have an electro-mechanical or solid-state switch construction.

Differential Pressure Transducer converts a differential or gauge air pressure signal to a 4-20 mA signal. A signal conditioning circuit runs as a two wire 4-20mA devices. The input pressure signals are mechanically dampened to reduce sensitivity to turbulence and short duration pressure fluctuations. Integral zero and span adjustments are factory calibrated to specified output signal levels and may be field adjusted if required. The circuit design produces very little interaction between span and zero pots. It includes HVAC monitoring of filter differential pressures, fan static pressures, clean room pressures, variable air volume systems and velocity pressures. It provides total of 30 field-selectable variations that include unidirectional and bi-directional pressure ranges. They also provide auto-zero capability and include field-selectable port swap feature. With all cast aluminum housing, transducers are available with optional LCD for on-site indication of line and differential pressure.

Differential pressure transmitter transmits low-level electrical outputs from pressure sensing devices to higher-level signals that are suitable for transmission and processing. It can be used to measure liquid, gas, or steam flow as well as liquid level, density and pressure. It can also be monitored from a remote location by use of digital communications.

Diffuse Reflective Sensors have source and detector within one fitting and are able to distinguish different reflector target types & colors. Diffuse reflective sensors are used for part ejection detection. They feature stainless steel casing for use in the beverage & food industry, durable protection & sealing of the optics, potentiometer, sensitivity adjustment and protection frame. Diffuse reflective sensors detect light-reflecting objects.

Digital 4 Line Barometer displays barometric pressure with trend, altitude, weather forecast icons, indoor temperature and humidity. They feature 4 lines LCD display 23 to 1.31°F, comfort zone indication, FC switch and need for 4 batteries 'AAA' 1.5V.