ISEN Industrial Pressure & Temperature Gauge is a mechanical process instrument designed to provide simultaneous local indication of pressure and temperature. By combining two measurement functions into one compact 3-inch gauge, it allows operators to monitor key boiler and process conditions directly at the equipment without requiring separate pressure and temperature indicators.
The gauge uses a Bourdon tube for pressure measurement and a stem-type temperature sensing element for temperature indication. Its dual-scale dial displays pressure and temperature using separate, clearly differentiated markings, allowing both parameters to be read from the same instrument.
The gauge is available with several pressure ranges from 0–60 psi / 0–400 kPa to 0–200 psi / 0–1400 kPa, while the temperature range is specified from 50 to 320°F / 10 to 160°C. Its pressure accuracy is specified at approximately ±3–2–3%, while the temperature scale accuracy is ±1 scale division.
Dual Pressure and Temperature Measurement in One Gauge
The main advantage of the ISEN Industrial Pressure & Temperature Gauge is that it combines two commonly monitored process parameters into one local instrument.
Pressure is measured mechanically through a phosphor bronze Bourdon tube. When process pressure enters the sensing system, the Bourdon tube deforms slightly. This mechanical movement is transferred through the brass movement mechanism to the pressure pointer.
Temperature is measured through the extended stem inserted into the process. The temperature indication is displayed on a separate scale on the same dial.
This arrangement is particularly useful for boilers and process equipment where pressure and temperature need to be checked together. Instead of installing two separate gauges, operators can read both values from one instrument mounted at a single measurement point.
The dual-scale dial uses red markings for temperature and blue markings for pressure, making it easier to distinguish the two measurements during operation. The temperature and pressure pointers are also differentiated, with the instrument using aluminum, black, non-adjustable pointers.
For operators working around boilers, heating equipment, or other pressurized systems, having both readings available at the same location can make routine inspection faster and simpler.
Bourdon Tube Pressure Measurement and Temperature Sensing
The pressure measuring element is a phosphor bronze Bourdon tube, a mechanical sensing element designed to respond to pressure changes.
When pressure increases inside the Bourdon tube, the tube changes its shape slightly. The internal movement mechanism translates this movement into pointer rotation, allowing the operator to read the corresponding pressure on the dial.
The gauge uses a brass movement, providing the mechanical connection between the pressure sensing element and the pointer. The pressure scale is available in both psi and kPa, allowing the instrument to be used with either commonly used pressure unit.
Temperature is measured through the gauge’s stem. The stem is available with different connection arrangements and dimensions according to the selected configuration. The temperature scale is graduated in °F and °C, with the available measurement range extending from 50 to 320°F or 10 to 160°C.
This combination gives the operator a direct mechanical indication of both pressure and temperature without depending on electrical power, digital communication, or an external control system simply to view the measurements.
3-Inch Dial and Clear Dual-Scale Display
The ISEN Industrial Pressure & Temperature Gauge uses a 3-inch dial, providing sufficient viewing area for two separate measurement scales.
The dial is manufactured from aluminum with a white finish, with red temperature markings and blue pressure markings. The contrasting colors help operators distinguish the two parameters quickly.
The pressure scale is located in the lower portion of the dial, while the temperature scale occupies the upper portion. Each parameter has its own pointer, allowing pressure and temperature to be read independently.
The lens is made from glass, while the case and ring are constructed from drawn steel with a black finish. This gives the gauge a compact industrial construction suitable for installation on boilers and process equipment.
The gauge’s compact design is useful where panel space is limited or where operators want both measurements available at the same physical location.
Because this is a mechanical gauge, the display provides an immediate local reading. Operators can visually check the current process condition without navigating a PLC screen, HMI, or SCADA interface.
Pressure Ranges, Temperature Range and Accuracy
The ISEN Industrial Pressure & Temperature Gauge is available with several pressure ranges to accommodate different operating conditions.
Available pressure ranges include:
- 0–60 psi / 0–400 kPa
- 0–75 psi / 0–500 kPa
- 0–100 psi / 0–700 kPa
- 0–200 psi / 0–1400 kPa
The temperature range is 50–320°F / 10–160°C across the listed configurations.
The pressure scale accuracy is specified at approximately ±3–2–3%, while the temperature scale accuracy is ±1 scale division.
Selecting the correct pressure range is important for obtaining a useful and readable indication. The selected range should correspond appropriately to the normal operating pressure of the system rather than being chosen solely according to the maximum possible pressure.
The operating temperature should also remain within the specified range. The process temperature range is 50 to 320°F (10 to 160°C), while the specified ambient temperature range is -40 to 250°F (-40 to 120°C).
These limits should be considered when the gauge is installed on boilers, heating equipment, or other systems where both process and surrounding temperatures can vary significantly.
Connections, Stem Options and Installation
The ISEN Industrial Pressure & Temperature Gauge is available with different connection arrangements for installation into process equipment.
The dimensional information includes back and bottom outlet configurations, with connection sizes including options such as 1/2-inch NPT and 3/4-inch NPT, depending on the selected configuration. The stem is specified at approximately 0.32-inch diameter, with different stem lengths available.
The appropriate connection and stem arrangement should be selected according to the available process connection and the installation depth required to measure the process temperature correctly.
For installation, the sensing stem needs to extend into the process sufficiently to provide the intended temperature measurement. The connection should be tightened securely, while care should be taken not to apply excessive mechanical force to the gauge body.
The gauge should be mounted where the dial is easy to read and where the instrument remains within its specified ambient temperature conditions.
Before installation, Valvelink recommends checking the pressure range, temperature range, connection size, stem length, mounting position, and process conditions. These parameters determine whether the selected configuration is appropriate for the actual equipment.
Boiler and Industrial Process Applications
The ISEN Industrial Pressure & Temperature Gauge is especially suited to applications where pressure and temperature need to be monitored together.
A typical application is boiler equipment. Boiler operators need to know both pressure and temperature because these parameters provide important information about the operating condition of the system. A combined gauge allows both values to be checked at the same measurement point.
Other potential applications include:
- Steam and hot-water systems
- Heating equipment
- Process boilers
- Industrial thermal systems
- Pressurized process equipment
- Water heating systems
- Industrial machinery
- Process piping
- Utility equipment
The gauge is particularly useful for equipment requiring straightforward local indication rather than electronic measurement and remote communication.
For example, an operator inspecting a boiler can immediately check the pressure scale and temperature scale without using two separate instruments. This can simplify equipment layouts and reduce the number of local indicators required.
When selecting an ISEN Industrial Pressure & Temperature Gauge, Valvelink recommends considering the required pressure range, process temperature, ambient temperature, pressure unit, temperature unit, connection orientation, connection size, stem length, and required installation position.
With a 3-inch dual-scale display, phosphor bronze Bourdon tube, brass movement, glass lens, steel case, and simultaneous pressure and temperature indication, the ISEN Industrial Pressure & Temperature Gauge provides a practical mechanical solution for local monitoring of pressure and temperature in boilers and industrial process equipment.
