Transmitters

The Eltek range of transmitters
GenII transmitters are been designed to work with many types of external of sensors to meet the requirements of a wide range of applications. Inputs for temperature, humidity, voltage/current (e.g.4-20mA) visible light, UV, event and pulse are already catered for (See the table below). In addition transmitters can have in-built sensors such as humidity and/or temperature only, light, differential air pressure and CO2.

A built-in 4 digit LCD is optional for most transmitters. For transmitters with multiple inputs, the LCD scrolls through the inputs indicating engineering units with the reading. The 10mm high characters assure a wide viewing angle.

Transmitters are attractively styled and extremely rugged using a drawn aluminium case. A built-in wall bracket with anti tamper features means the unit can be discreetly mounted if needed – ideal for incorporation in an exhibit case or factory production area. Versions are also available for outdoor use.

A brief summary of the models is listed below. If the version you require is not listed please contact Eltek as it may already be in development; if not we will be pleased to discuss finding a solution for you.

For a detailed specification of each transmitter available, see Literature and open or download the Telemetry brochure.

Model No.	Built-in Temperature
GC-05/GD-05	Built-in Temperature
Range -30 to +65ºC	Resolution 0.1ºC	Accuracy ±0.5ºC
GC-10/GD-10	Built-in Temperature and Relative Humidity
Range Temperature: -30 to +65ºC Relative Humidity: 0-100%	Resolution 0.1ºC 0.1%	Accuracy ±0.4ºC(+5 to +40ºC) ±1.0ºC(-20 to +80ºC) ±2%(10 to 90%Rh) ±4%(0 to 100%Rh)
GD-11	Built-in Temperature and Relative Humidity Input for Thermistor Temperature
Built-in temperature and humidity as GC-10. Thermistor temperature as GC-12.

Model No. (Inputs)	External Temperature
GC-12	Basic external Thermistor Temperature
Range: Resolution: Accuracy:	-40 to +70ºC 0.1ºC (-15 to +40ºC) 0.3ºC (-36 to +70ºC) ±0.2ºC (-15 to +40ºC) ±0.6ºC (-36 to +70ºC)
GS-21/GD-21 GS-24/GD-24	External Thermocouple Temperature (K/T)
Type: Range: Resolution: Accuracy:	K or T -200 to 200ºC 0.1ºC/0.2ºC ±0.3ºC Note: thermocouple connectors are not included.
GD-21AL	External Thermocouple Temperature (K/T) with built – in audible and visual alarm
	As GS-21
GD-24H	External Thermocouple Temperature (K)
Type: Range: Resolution: Accuracy:	K -200 to 1200ºC 0.5ºC ±0.3ºC
GD-24HV	External Thermocouple Temperature (K/T) with galvanic isolated inputs
	As GD-24
GS-31/GD-31 GS-32/GD-32 GS-34/GD-34 GS-38/GD-38	External Thermistor Temperature
Range: Resolution: Accuracy:	-50 to +150ºC 0.05ºC (-5 to +75ºC) 0.1ºC (-25 to +100ºC) 0.2ºC (-40 to +125ºC) ±0.1ºC (-5 to +75ºC) ±0.2ºC (-25 to +100ºC) ±0.4ºC (-40 to +125ºC)
GD-52 GD-52H	External Platinum Resistance Temperature
Type: Range: Resolution: Accuracy:	Pt100 2 or 4 wire -100 to 200ºC (GD-52), 0 to 300ºC (GD-52H) 0.1ºC ±0.3ºC

Model No. (Inputs)	Voltage and Current
GS-42 GS-44	Inputs for Voltage or Current with power for external sensors.
	Range 0-1V DC 0-10V DC 0-20mA DC 4-20mA DC	Accuracy ±0.5mV ±5mV 20uA 0.1%	Resolution 0.25mV 2.5mV 5uA 0.05%

Model No.	Light
GL-70	Built in Ultraviolet and Visible Light with Temperature and Humidity
	Temperature and humidity as GC-10
	Visible Light	Ultra Violet light
	Range: 0-4,000 Lux (Resolution: 0.1Lux) 0-200 KLux (Resolution: 0.01KLux)	Range: 0-5000mW/M² 0-10,000µW/Lumen
GS-72	External Ultraviolet and Visible Light with external Temperature and Humidity		GS72 with LS50 & RHT10D (RH/T/Light) GS-72 with LS70 & RHT10D (RH/T/Light/UV)
	RHT10-D with LS50 light only probe / LS70 light and UV probe.
	Visible Light (LS50/LS70) Range: 0-4,000 Lux (Resolution: 0.1Lux) 0-200 KLux (Resolution: 0.01KLux)	Ultra Violet light (LS70) Range: 0-5000mW/M² 0-10,000µW/Lumen
	For RH/T see RHT10D details. Can also be used with Rotronic or E plus E RH/Temperature probe.

Model No. (Inputs)	Pulse & Event
GC-60	State inputs
	2 state indications
GS-61	State inputs
	8 state indications
GC-62 GC-62a	Pulse inputs - Voltage free or digital
	Pulse width: Digital high/low: Max pulse rate: Max pulse count:	>500uS >2.5V/<1V 250Hz 216 (65,535)
	The 'a' suffix indicates inverted logic.

Case Heights

The system allows for up to 250 sensors to be connected across 125 transmitters. Typically, transmitters have 1,2,3 or 4 sensor input capability, however up to 15 sensors is possible. Note that just one transmitter can provide a cost effective system.

For detailed specifications please download the data sheet.

Calibration

Most GenII transmitters with internal sensors have been designed for easy calibration. The use of plug-in sensors means that calibrated sensors can simply be exchanged on site. This reduces system down time, disruption and ultimately cost.

Transmission

The transmitters send very brief data packets in time at user-defined, pre-set intervals. It is normal to send several transmissions during the logging interval to allow for the unlikely event that two transmissions from separate transmitters may clash. Due to short “on air” time and very low transmitter sleep current, exteneded battery life results, more than 5 years without forfeiting accuracy or reliability (dependant on model type and transmit interval)

Each transmitter battery voltage is monitored by the central Receiver Logger, so the user can easily check out “% battery remaining”. An alarm is raised when battery replacement is imminent.

Additionally, a system reliability indicator at the Receiver Logger shows if a good radio connection is available.