HD 788TR1 - HD 786TR1 HD 988TR1 - HD 988TR2 - Process Controls
+650°C, with a minimum amplitude of 25°C; it may be simply reprogrammed by pressing a key, without any need to regulate jumpers, potentiometers, software ...
CONFIGURABLE TEMPERATURE TRANSMITTERS 4÷20 mA FOR Pt100 SENSORS Description HD 788TR1, HD 786TR1, HD 988TR1 and HD 988TR2 are 4-20 mA transmitters with a microprocessor, configurable for Pt100 Platinum temperature sensors. They convert the temperature variations found with any standard Pt100 sensor (100Ω at 0°C) into a linear current signal with two leads in the field 4÷20 mA. Linearisation with a digital technique allows excellent precision and stability to be obtained. The user can set the 4÷20 mA output (or 20÷4 mA) in any temperature range within the field -200...+650°C, with a minimum amplitude of 25°C; it may be simply reprogrammed by pressing a key, without any need to regulate jumpers, potentiometers, software, etc. A led indicates any alarm situations (temperature outside the set range, broken or short-circuiting sensor) and assists the user in the programming phase. The transmitters are also protected against inversions of polarity. The HD 788TR1 is specifically designed for installing in type DIN B connecting heads, while the HD 988TR1 and HD 988TR2 are suitable for fitting in containers with a 35 mm DIN bar connection. As well as the 4÷20 mA output, the HD 988TR2 has a convenient 31⁄2 digit display (height 10 mm) which allows the display of the measured temperature. Suitable for fitting on the wall.
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Technical data (20°C and 24V DC) HD 788TR1 HD 786TR1 HD 988TR1
Sensor
3 (or 2) leads EN 60751, IEC 751 BS 1904 (α=0,00385) RLMax = 680 Ω @ Vcc = 24 Vdc 0,022 Lights up during the programming phase and when the measured temperature is outside the set range
Note 1) If the measured temperature T is outside the set range T1…T2 (T1
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