36
…10
PROGRAMMING
ELECTRICAL CAL
Test Retrans. (%)
Alter Sec. Code
Alarm Setpoint
Relay Action EA
EB
RTX Type 4-20
0-20
0-10
xxxxx
100.0
75.0
50.0
25.0
0.0
SET UP OUTPUTS
ALARM H2 IN CO2
AIR IN CO2
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Page Header – SET UP OUTPUTS
Advance to next parameter.
Purge Gas Alarm Select
Select the parameter on which the purge gas alarm is to operate.
Reprogram as required to agree with selected range:
i.e. for
Range 2 select H2 IN CO2
Range 3 select AIR IN CO2.
Purge Gas Relay Action
For Fail-safe alarm operation the relay's alarm state must be the same as the power-down
state, i.e. the relay is de-energized.
For high alarm operation the relay must be Energized Below the alarm set point (EB).
For low alarm operation the relay must be Energized Above the alarm set point (EA).
The alarm l.e.d.s are illuminated in the alarm condition.
Select the required alarm action from the following table:
The set point band is defined as the actual value of the set point plus or minus 1% of the set
point value. Alarm action occurs if the input value is above or below the set point band. If
the input moves within the set point band the last alarm action is maintained.
Purge Gas Alarm Set Point
The alarm set point can be set to any value within the input range being displayed. The set
point value is subject to hysteresis within the set point band as detailed above.
Set the alarm set point to the required value.
Retransmission Output Type
The retransmission output is assigned to the purge gas concentration.
Select the retransmission output current range required (4 to 20 mA, 0 to 20 mA or 0 to
10 mA).
Test Retransmission Output
The instrument automatically transmits a test signal of 0, 25, 50, 75 or 100% of the
retransmission range selected above. The % test signal selected is shown on the upper
display.
Example
– for a selected range of 0 to 20 mA and 50% retransmission test signal, 10 mA
is transmitted.
Select the required retransmission test signal.
Alter Security Code
Set the security code to a value between 00000 and 19999.
Advance to
Electrical Calibration Page
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LOWER DISPLAY
10.3.3
Set Up Outputs Page
Summary of Contents for 6553 Series
Page 46: ...44 NOTES ...
