Description
HTM 8500 Microprocessor based Integrating digital indicators are specially designed for direct interfacing to flow instruments such as magnetic flowmeters and differential pressure flow transmitters where linear and square laws are used. The indicators display flow rate directly in engineering units and at the same time calculate the Total flow against time at programmable rates. The change in totaliser readings are available as pulse output at the wiring terminals.
In standard configuration, the indicators are housed in 96X48mm DIN sized casings with front of panel keypads and Infra-red communication port. The indicators are equipped with back of panel RS485 port and dual programmable alarm relays.
All the indicator settings can be programmed through the front of panel keypads or downloaded from Handheld PDA via the Infra-red port. Data in the indicator can also be down or uploaded into personal computer through the RS485 port.
Application
HTM 8500 Microprocessor based Integrating digital indicators are suitable for the display of any instrument data using 4-20mA signal. e.g. flow, level, pressure, pH, A, V, PF, KW etc. It is particularly useful for the display of flow data where the totaliser readings are essential. Similarly, it is also suitable for the display of KW in electrical switchboard where KWH readings are required. In addition, HTM 8500 Microprocessor based Integrating digital indicators can be used as Flow or Batch Controllers, Level or pressure alarm relays and any other applications which require data display and alarm relay outputs at the same time.
The Infra-red port of the HTM 8500 Microprocessor based Integrating digital indicators are particularly useful in applications where the totaliser values and instrument data in the indicators are to be collected regularly. By pointing a handheld PDA towards the Infra-red port, all data, including totaliser values and calibration details of the indicator can be collected and downloaded to personal computer for further data manipulations.
When the RS485 port of HTM 8500 Microprocessor based Integrating digital indicators are connected to a Multi-drop loop, the data of up to 256 indicators can be monitored online. With the same configurations, the indicator settings can be changed online by using a host computer.
Specifications
Type : 8 Digit seven segment LED
Rate display : 0 – 50000
Total display : 0 – 99999999
Decimal : programmable
Status display : Display & alarm status
Totaliser scaling factor : 0.001, 0.01, 0.1, 1, 10, 100, 1000
Input : 0/4-20mA, 0/1-5V
Input Impedance : 22 Ohms (current) 1 Mohms (voltage)
Input signal type :Linear or Square root law
Communications : Infra-Red and RS485
Accuracy : +/-0.05%
Repeatability : +/- 0.05% of span
Resolution : : 0.01%
Linearity : 0.05%
Temperature coefficient : <=5 ppm/°C
LED Colour : Super red
Numerical height : 9.14mm
Pulse output : NPN O/C transistor switch
Pulse output scaling : One pulse per integer change
