KROHNE Summit 8800 Vol 1 - Manual (Page 18)

18 www.krohne.com 08/2013 - MA SUMMIT 8800 Vol1 R02 en
SUMMIT 8800 DESCRIPTION 03
ultrasonic gas meters or from differential pressure measurement across orifice plates together
with temperature sensors and transmitters for line pressure.
The SUMMIT 8800 uses pre-set or active input values of relative density, gas composition data
and heating value, active values can be received directly from a gas chromatograph or can be
written serially from a supervisory system.
The flow of gas is calculated using gas compressibility (Z factor) methods selected from a list
of which includes AGA 8, ISO 12213 and AGA 3 NX19 as well as fixed factors for certain appli-
cations. As an alternative, the flow of gas can be calculated using a transducer input for line
density.
The flow of liquid is calculated using fixed or measured factors for density and relative density
and correction based upon measured temperature and pressure of the liquid in accordance with
API standard chapters 11.1, 11.2.1M, 11.2.2M & 12.
The flow computer has the facility of both high and low alarms on all active input signals, the
alarms can be selected to enable a default value to be used in flow calculation for the parameter
in the alarm condition. Indication is given of the time of occurrence and clearance of the alarm
state, alarm output signals are also provided. It uses digital communication to the differential
pressure, pressure and temperature transmitters using the HART protocol eliminating the need
for calibration of the flow computer. This feature also eliminates the errors in flow measure-
ment due to ambient temperature effects on the flow computer, only the temperature coefficient
of the transmitters contribute to the error.
Alternatively the SUMMIT 8800 can be operated from transmitters that supply a 4–20mA cur-
rent output and also direct from a 100 ohm platinum resistance thermometer for temperature
measurement, these types of input are measured using analogue inputs and a high resolution
A-D converter. The analogue inputs are calibrated using software.
The SUMMIT 8800 has 3 optional RS232/RS485 serial data ports which can provide Modbus RTU
or ASCII communication protocols for operation with system devices and a serial ASCII protocol
compatible with most printers.
The SUMMIT 8800 has 2 optional Ethernet port which can provide TCP/IP or Modbus over TCP/
IP protocols for supervisory system communication, and includes 5 programmable solid state
pulse/alarm outputs and 2 analogue output signals for process monitoring and status control.
3 .1 .3 SUMMIT 8800 front panel layout
Figure 1 Front view of Summit 8800