SERIES HD 2047
Pt100 SIMULATOR
HD 2047 is a handheld instrument designed to test and calibrate instruments with Pt100 input (100W 0°C) and voltage/current outputs, such as active or passive temperature transmitter, recorders, testers and data loggers, etc.

SERIES HD 788TR1, HD 988TR1, HD 988TR2, HD 786TR1
The series of transmitters HD 788TR1, HD 988TR1, HD 988TR2 are 4÷20mA temperature transmitters configurable in the range -200...+650°C. The output 4÷20mA (20÷4mA) is configurable at any position of the range, 25°C is the minimum range to be set. The HD 788TR1 is suitable for fitting in the head of the DIN B, the HD 988TR1 is suitable for setting on 35 mm DIN rail attachment up, it fills a module (17.5 mm), the HD 988T2 is suitable for DIN rail attachment too, it fills two modules, it's fitted with 3¹/₂ digit LCD height 10 mm, it shows the temperature which corresponds to the output. The HD 786TR1 is a 4÷20mA wall mounting transmitter.
Principal characteristics:
- Temperature sensor: Pt100 (100W a 0°C a=0.00385°C^-1);
- Connection: 2, 3 wire; - Sensor current: below 1 mA;
- Linearization as per IEC 751, EN 60751; - Conversions: 2 each second

HD 688T SERIES MODULAR
The transmitter converts the signal coming from a Pt100 sensor into an analogue signal that can be selected by a Jumper among these values: 0÷20mA, 4÷20mA, 0÷10V. The signal is galvanically separated among input, output and power supply. The transmitter is built into a two-module DIN container for 35 mm asymmetric guide..
Principal characteristics:
- Galvanic separation among input, output and power supply
- Pt100 Platinum probe
- Insulation: 3kV at 50Hz for 1 minute
- Scale configurations

MODULAR SIGNAL CONVERTER SERIES HD 588
This device converts the analogue signal among input, output and power supply. Input and output are galvanically separated from one another, can be modified and selected by strappings.
Principal characteristics:
- Universal input stage: signal 0÷20mA, 4÷20mA, 0÷10V
- Universal output stage: signal 0÷20mA, 4÷20mA, 0÷10V
- Power supply stage: 12÷24V@±10%, 80mA

Relative humidity transmitters and relative humidity and temperature transmitters convert the variation that occurs simultaneously inside a relative humidity capacitive sensor and a resistive Platinum sensor both into a 4÷20mA linearized signal and, depending on the various models, into 0÷1V, 0÷10V, 0÷20mA or 4÷20mA signals.
They are distinguished in two-wired current-looped passive transmitters, separately power-supplied active transmitters (with voltage usually of 24Vac), and finally passive and active transmitters which can work with either of the two possible kinds of power supply - two wires with current loop, or grid of 24Vac.
They are essentially available in three different versions of assembly (TV,TO,TC) and stem length (150 to 550 mm):
TV version with vertical probe for wall-fitting;
TO version version with horizontal or channel probe; the transmitter is usually held by a slip joint that allows it to adapt to the size of the channel;
TC version where the electronics are separate from the sensor / probe and linked to them by a connecting cable.

SERIES DO 9403T-R1, DO 9785T, DO 9765T
These transmitters translate the signal coming from a pH electrode into an analogue 4÷20mA signal. If the Pt100 temperature probe is connected the signal may be compensated. The keyboard and the LCD indicator allow calibration and setting of the relay thresholds. Input and output are galvanically insulated.

SERIES HD 9408T
These transmitters are formed by a stainless steel cylinder in which is located the pressure sensor. The bending of a flexible Alumina diaphragm makes the value of the piezoresistive resistances vary. This variation is proportional and linear with the pressure.
Principal characteristics:
- Regulation of zero and full-scale value ±5%
- Material in contact with the diaphragm: gas or liquids
- Overpressure limit: twice the rated value
- Weight: 190 grams
- Dimensions: 88x30mm
- Connections by connettor DIN 45326

SERIES HD 2004T
HD 2004T and HD 20V4T are microprocessor pressure transmitters, the first one hav-ing
a current output (4÷20 mA) and the second one a voltage output (0÷5V, 1÷5V or 0÷10V).

SERIES DO 9786TR1, DO 9766TR1
These transmitters translate the output of a 2/4 electrodes conductivity probe into a thermally compensated 4÷20mA signal. The keyboard and the LCD indicator allow calibration and setting of the relay thresholds. Input and output are galvanically insulated.
Principal characteristics:
CONDUCTIVITY INPUT
- Measuring range 0.0÷199.9mS
- 2/4 electrodes: Configurable cell constant of 0.01÷199.9 cm^-1
- Input impedance: >100Mohm
- Accuracy: 0.5% of reading ±2 digits ±0.01%/°C of temperature drift

TEMPERATURE INPUT
- Pt100 2/4 wires: -50...+199.9°C
- Accuracy: 0.2°C ±0.1% of reading ±0.01°C per °C of drift

TEMPERATURE COMPENSATION
- Manual: linear 0.00...4.00%/°C -50+200°C
- Accuracy: linear 0.00...4.00°C/°C -50+200°C

CURRENT OUTPUT
- 4.00...20.00mA: programmable and proportional to conductivity
- Accuracy: 0.5% of reading ±0.02mA

POWER SUPPLY
- Passive: 4÷20mA configuration 2 wires, 10÷35V
- Active: 24Vac, on request 230Vac - 15/+10%, 3VA, 48...62Hz

EXTERNAL DIMENSIONS
- DO 9766TR1: 120x122x56 mm
- DO 9786TR1: 96x96x126 mm

SERIES HD 2021T
HD2021T: full scale 20...2000 lux, power supply 16...40 Vac/dc. Output 0...10 Vdc.
HD2021T1: full scale 0.2...2000 W/m², power supply 16...40 Vac/dc. Output 0...10 Vdc.
HD2021T6: full scale 100...200.000 cd/m², power supply 16...40 Vac/dc. Output 0...10 Vdc.