A. Product Overview

The iTherm PI-JD Series Process Indicator is an industrial jumbo display indicator developed for applications where process values need to be visible clearly from a distance.

The series includes:

PI-JD-2: 2.7 inch red LED display

PI-JD-4: 4 inch red LED display

Both models use a 4 digit, 7 segment red LED display and support a wide range of temperature sensors and standard industrial analog signals.

The PI-JD Series supports thermocouple inputs including J, K, R, S, N, T and B types, along with Pt100 RTD sensors. It also supports standard process signals such as 0 to 20 mA, 4 to 20 mA, 0 to 1 VDC, 0 to 3.3 VDC, 0 to 5 VDC and 0 to 10 VDC.

For analog inputs, the display can be configured over a range from minus 1999 to 9999, allowing the indicator to represent different process parameters according to the connected transmitter and configured scaling.

The indicator also provides selectable resolution and digital filtering to help achieve stable and readable process indication.

B. Working Principle

The iTherm PI-JD Series works by receiving an electrical signal from a temperature sensor, process transmitter or other compatible measuring device.

For temperature measurement, a thermocouple or Pt100 RTD sensor is connected directly to the indicator. The instrument interprets the sensor signal and displays the measured temperature on the large LED screen.

For other industrial process measurements, the PI-JD Series can receive standard analog signals such as 4 to 20 mA, 0 to 20 mA or DC voltage.

For example, a pressure transmitter may convert the measured pressure into a 4 to 20 mA signal. The PI-JD indicator receives this signal, converts it according to the configured range and displays the corresponding process value.

The basic measurement flow is:

Sensor or Transmitter → Electrical Signal → PI-JD Process Indicator → Digital Process Value

The selectable digital filter can also be used to stabilize the displayed value when the incoming signal fluctuates.

C. Why is the PI-JD Process Indicator Used?

The main purpose of the PI-JD Series is to provide a large and easily visible digital indication of an industrial process value.

Standard panel indicators can be difficult to read when operators are standing several metres away from a machine or process area. The PI-JD Series addresses this requirement by using a larger display.

It can be used for monitoring parameters such as temperature, pressure, level, flow, humidity and other measurable process variables when a compatible sensor or transmitter provides the required input signal.

Typical uses can include:

Temperature monitoring

Pressure indication

Tank level monitoring

Flow monitoring

Humidity indication

Process transmitter display

Machine parameter monitoring

Production area indication

Utility monitoring

Remote process value display

The universal input capability also allows the same type of display to be used with different sensors and transmitters depending on the application.

D. Suitable Buyers

The iTherm PI-JD Series can be suitable for buyers who require a large industrial digital display for process monitoring.

Typical buyers include:

OEMs: Machine manufacturers requiring large process value displays on industrial equipment.

Panel Builders: Control panel manufacturers requiring external or easily visible process indication.

Manufacturing Plants: Plants requiring operators to monitor temperature or other process values from a distance.

Instrumentation Engineers: Engineers working with RTD, thermocouple and analog transmitter signals.

Automation Companies: Companies integrating sensors and transmitters into industrial monitoring systems.

Maintenance Departments: Teams replacing or upgrading industrial process indicators.

Process Industries: Facilities monitoring parameters such as temperature, pressure, flow, level and humidity.

System Integrators: Integrators developing industrial measurement and monitoring solutions.

I-Therm states that its process control and measurement products are used across industries including pharmaceuticals, food processing, textile dyeing, plastics, chemical plants, furnaces, ovens, medical applications and general automation.

Frequently Asked Questions

1. What is the iTherm PI-JD Series?

The iTherm PI-JD Series is a jumbo display industrial process indicator designed to display temperature and other process values using thermocouple, RTD and standard analog inputs.

2. What is the difference between PI-JD-2 and PI-JD-4?

The primary difference is the display size. The PI-JD-2 has a 2.7 inch display, while the PI-JD-4 has a larger 4 inch display. Both use a 4 digit red LED display.

3. Does the PI-JD Series support 4 to 20 mA input?

Yes. The PI-JD Series supports 4 to 20 mA input as well as 0 to 20 mA input. This allows it to work with many industrial process transmitters.

4. Can the PI-JD Series be used with a Pt100 RTD sensor?

Yes. The indicator supports Pt100 RTD input for temperature measurement.

5. Which thermocouples are supported?

The PI-JD Series supports J, K, R, S, N, T and B type thermocouples.

6. Does the PI-JD Series support voltage input?

Yes. Supported voltage inputs include 0 to 1 VDC, 0 to 3.3 VDC, 0 to 5 VDC and 0 to 10 VDC.

7. Can the PI-JD Series display pressure or level?

Yes, when a compatible pressure or level transmitter provides a supported analog signal such as 4 to 20 mA or 0 to 10 VDC, the indicator can be configured to display the corresponding process value.

8. Can it be used as a temperature indicator?

Yes. The PI-JD Series can accept thermocouple and Pt100 RTD inputs, making it suitable for industrial temperature indication.

9. What is the display range for analog inputs?

The configurable display range for analog inputs is minus 1999 to 9999 with selectable decimal resolution.

10. What power supply does the PI-JD Series require?

The standard supply voltage specified by iTherm is 90 to 270 VAC at 50 or 60 Hz.

11. Does the PI-JD Series have digital filtering?

Yes. A selectable digital filter from 1 to 10 is specified, which can help stabilize fluctuating process readings.

12. Where can a jumbo display process indicator be used?

It can be used in industrial locations where operators need to view temperature or process measurements clearly from a distance, including manufacturing areas, control rooms, machinery, production lines and process monitoring systems.