Our Products - Sensors Remote Setpoints and Transducers

TR3800 TR3840 TR3700 TR3740 TR3500

Description

The TR3800 smart sensor is a slim attractive wall mounted temperature sensor with a very unique feature. It has a tiny fan that draws air in from the bottom of the housing over the sensor and discharges through the top. The fan is located at the top of the housing and draws air through an inlet plenum. The sensor is located at the bottom of the housing in the inlet plenum. The fan also draws air from the electronics section to remove heat.

The TR3840 smart sensor is similar to the TR3800 sensor except it has a 2 x 16 character LCD display and four pushbuttons. These are located behind a door with a viewing aperture for the display. The pushbuttons are Raise and Lower for setpoint adjustment, Select pushbutton to enable functions and a System On/Off pushbutton to turn the Air Conditioning System on and off when ever that function is enabled.

The TR3700 smart sensor is similar to the TR3800 except that is has a humidity sensor on board as well as the temperature sensor. The TR3740 is similar to the TR3840 with the addition of the humidity sensor and has the display and pushbuttons.

All of the above sensors operate on a two wire non polarised connection to the TC5042 controller. Power and communications are supplied over the one pair of wires. Up to four sensors, including one TR3840 sensor can be connected to the same pair of non polarised wires. The controller will recognise how many are connected and average the sensors.

The TR3500 fan aspirated sensor is similar in appearance to the TR3800, however it is a three or four wire connection. This enables the sensor to be used with other controllers and systems. The sensor can be thermistor, platinum or nickel resistance sensors and the power for the fan can be from 6 -24 volt A/C or D/C.

LCD DISPLAY

This is a 2 x 16 character LCD display with WHITE backlighting. The top line will display the Temperature and/or Humidity. This line will remain permanently displayed in normal mode. The second line displays the setpoint. This can be adjusted by pressing the Select Button and using the Raise / Lower buttons to change the setpoint. It is adjustable in 0.5 C increments.

The TR3840 has a default setpoint range of 20 – 25C. This can be altered to any range between 10 and 40C. It can also be reduced to a smaller range, 22 – 24C or even 23 – 23C.

Technical Data

Supply Voltage	TR3800 TR3840 TR3700 TR3740 Power & Comms supplied from TC5042
	TR3500 6 - 24V AC/DC
Power Consumption	0.2W Max
Fan Life	MTTF 50,000 Hrs.
Ambient Temp Operation	0 – 50C
Ambient Humidity	Max 90%RH
Dimensions	L115 x H72 x D16mm
Colours	Electric White, Titanium (Brushed Metallic Finish).
Weight	5g
TR3500	Thermistor 10K. Can be supplied with alternate sensors. Fan Aspirated Sensor – Patent Pending

Configuration Menu

The Configuration Menu is as set out below:
EXIT
SETPOINT RANGE
SYSTEM TIMER
SENSOR DISABLE
SETPOINT RES
STANDALONE
EXIT

Setpoint Range
TR3840 Smart Sensor – Temp Only
To change the Setpoint Range push and hold the SEL button for 10 seconds.
SETPOINT RANGE will appear.
Push SEL and 20-25C will appear or whatever range may have been previously set.
The Lower Setpoint will be 20C or the last value entered.
Raise or lower this to the desired value.
Push the SEL button. The Upper Setpoint can now be adjusted to the desired value.
Press SEL and the display will return to the main screen.

TR3740 Smart Sensor – Temp & Humid
Pressing the SEL button will alternate between Temp & Humid Setpoints.
Select Temp SP, press and hold SEL for 10 seconds and adjust as above.
For Humidity Setpoint Range adjustment, select Humid SP, press and hold SEL for 10 seconds and adjust as above. The values will be %RH not degrees C.
Default range is 50-60%RH

System Timer
This function is used to set a run time for the A/C system whenever the TC5042 is set for FAN CONTROL.
For example, if set for 2 hours and the On/Off button is pushed, the system will run for 2 hours and turn off.
If the system is running, pressing the On/Off button will still turn the system off.
Press SEL for 10 seconds to enter the main menu page.
Scroll down to System Timer.
Press SEL and HOURS will appear.
Scroll up or down (if previously set) to adjust the run time in 0.5hr increments. Max 12 hours.
Press SEL and the display will return to the main screen.

Sensor Disable
This function is used to disable the internal sensor if the TR3840 is being used as a Remote Setpoint and/or an On/Off control.
Press SEL for 10 seconds and scroll down to SENSOR DISABLE.
Press SEL and SENSOR DISABLE NO and YES will be displayed.
Scroll down to YES, press SEL, the sensor is now disabled and the display will return to the main screen.

Setpoint Res (Resolution)
This function is for changing the Setpoint Resolution from 0.5C to 0.1C.
Press SEL for 10 seconds and scroll down to SENSOR RES.
Press SEL and 0.5C and 0.1C will be displayed.
Scroll down to 0.1C.
Press SEL and the display will return to the main screen.

Standalone
The Standalone mode will allow the TR3840 or TR3740 Smart Sensors to operate as a remote Temperature and/or Humidity display.
Connect the Smart Sensor to an external power supply, 8-24VDC.
After 10 seconds, an ERROR 1 will be displayed, indicating a communications error.
Press SEL button and STANDALONE NO or YES will be displayed.
Scroll down to YES.
Press SEL and the display will return to the main menu.