BRONKHORST E-7000 Series, Instruction Manual

Page: 33 / 33

BRONKHORST HIGH-TECH B.V.
9.17.017 page 33
2.11.5 Using polynomial functions at readout/control unit
The parameters for the polynomial function is stored at the readout and control-module and can be changed
from the keyboard.
Normally the transfer function of the sensor signal is linear Y = X. The connected device will have linearized
transfer functions after (normal) calibration.The accuracy however, will be
≤
1 % full scale.
When a special polynomial function calibration is wanted, the parameters 'a-d' will be destillated and printed
on the calibration certificate. In the 'INSTRUM. CONFIG'-menu you just have to enter these values.
Now you can connect and operate the concerned device.
Note:
Only this device will operate correctly; if you want to connect an other device to this channel, first change the
polynomial function parameters.
3 MAINTENANCE
-
Be sure you operate under the correct input specifications.
-
Be sure the system operates within its temperature range.
-
When replacing a defective fuse, first solve the problem.
-
Only install a fuse with the correct current rating (see label).
-
Only clean the housing (keyboard and display) with a (moist) polishing cloth. Do not use aggressive
cleaning fluids.
4 TROUBLESHOOTING
LCD is not lit after 'power on' check power input
check fuse
Display is blinking check cable to CEM unit
Improper reading check module settings
No reading/control check instrument cabling
Improper system operation (alarm) check module settings
Instrument does not respond to setpoint given at
keyboard 1) setpoint source at operation menu should enable
setpoint at "keyb. & FLOW-BUS". (other settings
means different behaviour).
2) setpoint could have been overruled at an alarm
situation (first perform reset)
3) setpoint slope has a large value. (setpoint will
slowly change in time). Change slope value if
necessary.
4) Setpoint could be changed by other devices
connected to the FLOW-BUS.
5) check polynomial factors at instrument menu.
Setpoint menu cannot be reached check setting of connected instrument type at
instrument menu. For sensor (meter) types setpoint
facilities will be disabled.
Alarm is not responding to reset. check if reset-source has been enabled at reset
menu of reset.
Instrument seems to give inaccurate values check if correct fluid set (with calibration factors) has
been selected see fluidname).