“OUR Senseca HD 48 and HD 49 passive or active transmitters that measure temperature, relative humidity and dew point temperature are one of our leading sellers in South Africa due to their cost effectiveness, high-accuracy measurement and reliability”, said Senseca South Africa MD, Jan Grobler.
“Both series of transmitters are designed for temperature and humidity control in conditioning and ventilation applications (HVAC/BEMS) across sectors such as blow drying plant, industrial and specialised processing plant, pharmacy, museums, clean rooms, ventilation ducts, industrial and civil sectors, greenhouses, auditoria and high density farms and offer a factory calibrated transmitter, meaning that no other further adjustments are required,” said Grobler.
HD48 Transmitter
The HD48 Series transmitter is an active transmitter and accepts both direct and 24Vac alternating power supplies. They have a standard (4-20 mA) or voltage (0 – 10V) outputs or a serial RS485 output. It has screw type terminal block electrical connections, a standard PBT and 10 µm stainless steel grid protection (P8) and a TV probe working temperature of between -20°C – + 80°C. It is Electronic Protection Class IP66.
Various accessories are available including the ability to attach the probe to a duct, which can be utilised with the HD9008.31 flange, a 3/8th inch universal biconical connection or a PG16 metal cable gland. Its 4-digit optional display shows the measured parameters in a continual or sequential mode.
The HD 48 Series with RS485 output allows several instruments to be connected to form a network. The instruments are connected in a sequence though a shielded cable with twisted pair for signals and a third for wire for the ground.
HD 49 Transmitter
The HD49 Series transmitter is a passive transmitter and suitable to be inserted in a 4 – 20 mA current loop. The HD49 has a 12 – 40 Vdc electrical connection. It has a stainless steel 10 µm filter to protect the sensor against dust and particles and is also classified as Electronic Protection Class IP66.
Various HD 49 models include:
- horizontal probe for duct mounting (TO),
- vertical probe for wall mounting (TV),
- probe with 2 or 5 m cable (TC),
- fixed contact Pt100 probe for solar panel (TFP)
For the TO and TC versions, two probe temperature ranges are possible: Standard -20 – +80°C and Extended -40 – 150°C. The temperature range of the thin film 1/3 DIN Pt100 probe for solar panels is -40 – +85°C.
HD49 transmitters are also available with an LCD display and have an electronic working temperature of -20 – +60°C.
Both series of transmitters measure relative humidity with a well proven temperature compensated capacitive sensor that assures precise and reliable measurements over the course of time. These are available in two probe temperature ranges comprising Standard – 20°C – + 80°C and Extended – 40°C – +150°C for the most critical applications.
“Senseca is recognised as a leader in the provision of high quality measurement instrumentation.
The HD 48 and 49 are extremely lightweight transmitters that offer the high accuracy and precision that industry requires. They deliver a cost effective and competitive lifespan without any compromise on design and performance,” said Grobler.
