Front view of FG7020 with a metal sensing probe, mounting flange and aluminum junction box
Angled view of FG7020 showing its probe, flange, junction box and signal cable
FG7020 component illustration identifying the probe filter, mounting flange, aluminum housing and cable entry
FG7020 transmitter showing the probe filter cap, flange structure, junction box and cable

Flange-mounted sensing probe with an aluminum junction box for wiring access.

FG7020 4-20mA Duct Temperature and Humidity Transmitter

Measure air temperature and relative humidity and send separate 4–20mA signals to compatible controllers or data acquisition equipment. FG7020 combines a flange-mounted probe with an aluminum junction box and a 15–24V DC supply for duct and equipment installations.

  • Separate temperature and humidity current signals for compatible analog input channels.
  • Aluminum junction box provides access to the internal wiring terminals.
  • Flange mounting positions the sensing probe at the air measuring point.
  • DIP-switch temperature range selection to match your measurement requirements.
4–20mA
Analog current outputs
15–24V DC
Power supply
Aluminum
Junction box housing

Confirm that the receiving equipment supports the required 4–20mA inputs. Match its wiring and temperature scaling to the transmitter configuration.

Request a Quote

Include your measuring range, receiving equipment, required quantity and delivery country.

Specifications & Installation Dimensions

Check the current outputs, supply requirements and measuring ranges, then review the probe, flange and junction box dimensions.

FG7020 analog current output transmitter with an aluminum junction box and flange mount.
Specification FG7020
Measured parameters Air temperature and relative humidity
Output type Analog current signals
Output signals Separate 4–20mA outputs for temperature and humidity
Power supply 15–24V DC
Selectable temperature ranges
0 to 50°C — default −20 to 80°C −40 to 60°C −40 to 120°C
Temperature range selection DIP switches inside the junction box
Humidity measuring range 0–99.9% RH
Temperature accuracy ±0.5°C at 25°C
Humidity accuracy ±3% RH
Temperature resolution 0.1°C
Sampling interval 3 seconds
Junction box Aluminum-alloy housing
Electrical connections Wiring terminals inside the junction box
Installation Flange mounting

Configure the receiving channels for 4–20mA inputs and match their measurement scaling to the transmitter settings. Follow the FG7020 wiring instructions for supply and signal return connections.

FG7020 front and side drawings showing probe, mounting flange and junction box dimensions
Open full-size dimension drawing ↗

Probe, Flange & Junction Box

Check the probe insertion space, flange mounting position and clearance around the junction box.

Mounting
Flange-mounted sensing probe
Wiring access
Terminals inside the junction box
Cable entry
Cable gland on the junction box

Leave access for opening the box and routing the cable. Position the sensing end in representative airflow; do not immerse the probe in liquids.

Connect the Current Signals and Set the Measuring Range

Access the terminals and range switches inside the junction box, then configure the receiving equipment for the temperature and humidity signals.

Open FG7020 junction box showing wiring terminals, circuit board and temperature range DIP switch diagrams Open full-size terminal and switch image ↗
Follow the terminal markings and instructions supplied with your unit for the electrical connections and DIP switch positions.

01 / Junction Box Connections

15–24V DC Supply and Two Current Outputs

With power disconnected, open the junction box to access the terminals. Identify the supply connections and separate temperature and humidity outputs using the unit markings and supplied wiring instructions.

DC supply
Connect a 15–24V DC supply with the polarity specified for the unit.
Temperature output
Connect to a compatible 4–20mA input channel for temperature.
Humidity output
Connect to a separate compatible 4–20mA input channel for humidity.
Signal return
Follow the transmitter and input module diagrams for the return connections.

02 / Temperature Range

Match the Range to the Receiving Inputs

The DIP switches select the temperature measuring range. Configure the receiving equipment to interpret the current signals using the corresponding measurement scales.

  1. With power disconnected, select the required temperature range using the switch diagram.
  2. Configure both receiving channels for 4–20mA current input.
  3. Match the temperature channel to the selected temperature range and the humidity channel to the specified humidity range.

Example: With the transmitter set to 0–50°C, configure the temperature channel for a 4–20mA input representing 0–50°C.

Industrial Air Measurement with 4–20mA Outputs

Send air temperature and relative humidity measurements to compatible current input systems in ventilation, production and facility applications.

Industry application illustrations for FG7020 showing chemical processing, metallurgy, food, petroleum, plastics and pharmaceuticals
Industry application illustrations. Match the measuring location, environmental conditions and electrical configuration to your installation.
Food & Pharmaceutical Facilities

Facility Air & Ventilation Ducts

Measure air temperature and humidity in ventilation ducts serving production or storage areas. Connect the separate current signals to compatible facility control or acquisition inputs for the site's monitoring requirements.

Plastics & Metallurgy

Production-Area Air Measurement

Position the probe at an air measuring point near production equipment or within ventilation ductwork. Select a temperature range that covers the expected conditions and configure the receiving 4–20mA temperature input to match.

Chemical & Petroleum Facilities

Ventilation & Control-System Integration

Supply air temperature and humidity measurements from a suitable ventilation or equipment location to compatible current input channels. Specify the air composition, installation environment and site requirements when checking suitability.

Frequently Asked Questions

Answers about current outputs, controller compatibility, power requirements and installation.

Does FG7020 provide both temperature and humidity outputs?

Yes. FG7020 provides separate 4–20mA current signals for air temperature and relative humidity. Reading both measurements requires two compatible current input channels on the receiving equipment.

Can FG7020 connect to my PLC or controller?

It can connect to equipment with compatible 4–20mA analog inputs. Check the input module's connection requirements, signal return wiring and measurement scaling against the transmitter instructions.

FG7020 requires a 15–24V DC supply. Send us the controller or input module model if you need help checking the electrical match.

How does FG7020 differ from FG7010 and FG6020?

FG7020 combines 4–20mA current outputs with an aluminum junction box. FG7010 has a similar junction-box structure and provides analog voltage outputs.

FG6020 also provides current outputs, using a compact probe-style body with an attached cable. Compare each model's power requirements, dimensions and wiring arrangement before selecting.

How do I select the temperature measuring range?

With power disconnected, access the DIP switches inside the junction box and follow the terminal and range-setting instructions . Available ranges are 0–50°C, −20–80°C, −40–60°C and −40–120°C, with 0–50°C as the default setting.

Configure the receiving temperature channel for a 4–20mA input representing the same selected temperature range.

Can the probe measure water or other liquids?

FG7020 measures air temperature and relative humidity. Expose the sensing end to the air being measured; do not immerse the probe in water or other liquids.

Describe any condensation, direct spray, dust or unusual air composition so we can check suitability for the installation.

What mounting and wiring access should I allow?

This page shows the flange-mounted configuration. Check the probe insertion space, duct opening and flange position against the dimensional drawing.

Leave clearance to open the aluminum junction box, access the wiring terminals and range switches, and route the cable through the cable gland.

Request a Quote for FG7020

Need a 4–20mA temperature and humidity transmitter with an aluminum junction box? Tell us about your application so we can confirm the measuring range, equipment compatibility, pricing and shipping options.

Include these details if available:

  • Receiving equipment: The controller, PLC or input module model, or its 4–20mA input specifications.
  • Measurement and power: Expected air temperature and humidity, and your available DC supply voltage. FG7020 requires 15–24V DC.
  • Installation requirements: Duct opening, available probe insertion space, installation environment and cable requirements.
  • Quantity and destination: How many FG7020 units you need and the delivery country.

Need help checking the configuration? Describe your installation and share the receiving equipment's input specifications. We can help check the electrical match and provide the available product and wiring information.

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