ABUS Technologies RHT WM with LCD Датчики - Manual (Page 4)

ABUS TECHNOLOGIES INC.
4
RHT
1. INTRODUCTION
The Relative Humidity and Temperature Transmitters RHT-WM and RHT-DM
are microprocessor-based instruments that incorporate high-accurate and stable
sensors whose information is converted to linear 4-20 mA or 0-10 Vdc.
As they are microprocessor equipment, they can be totally configured through
the communication interface ATxConfig and ATxConfig software.
The humidity output can be configured to represent the Relative Humidity
measured or the temperature value at dew point.
The RHT-WM model is intended for wall mounting. The RHT-DM comes with a
probe tip for duct or wall mounting.
2. PRESENTATION
Technical Parameters
HUMIDITY MEASUREMENT
Accuracy:
Refer to figure RHT and Temperature accuracies;
Repeatability: ±1 % RH;
Hysteresis: ±1 % RH;
Non-linearity: << 1 % RH;
Stability: < 1 %RH / year;
Span: Any value between 0 and 100 % RH or –40 and 100 °C for dew
point;
Response time: 4 seconds in slow moving air.
TEMPERATURE CHANNEL
Accuracy:
Refer to figure RHT and Temperature accuracies;
Repeatability: ±0.1 °C;
Span: Between -40 and 120 °C;
Response time: Up to 30 seconds in slow moving air.
GENERAL SPECIFICATIONS
Power supply:
12 Vdc to 30 Vdc (4-20 mA model) or 18 to 30 Vdc (0-10 V
model).
Outputs: 4-20 mA or 20-4 mA current, 2-wire loop power supply, 0-10
Vdc voltage (optional).
OUT1 output resolution: 0.006 mA (4-20 mA) or 0.003 V (0-10 V);
OUT2 output resolution: 0.022 mA (4-20 mA) or 0.015 V (0-10 V);
Channel isolation: The 4-20 mA outputs are isolated from each other. The 0-10 V
outputs share a common ground;
Output Load (RL): 4-20 mA output: RL (Ohms max) = (Vdc – 12) / 0.02
Let Vdc = Loop power supply (12 to 30 Vdc)
0-10 Vdc output: RL (min) = 10 kilo ohms
Reverse polarity protection: YES
Protection: Electronic circuit case - IP65; Sensors capsule: IP40
Cable entrance: Compress fitting PG7;
Operating limits: Sensor e probe (RHT-DM): See Figure 01;
Electronic circuit: -10 to +65 °C, 0 to 95 %RH.