Eurotherm Chessell 4100G, Technical Manual

Page: 20 / 62

100mm GRAPHICS RECORDER TECHNICAL MANUAL
HA249875
Issue 1 Jan 99 Section 1
Page 1 - 11
1.3.2 RECORDER FUNCTIONS (Cont.)
ALARMS (Cont.)
All of the above alarm attributes are set up as a part of the Alarm Setpoint and Job Configuration for the relevant
channel, totaliser etc. If the Operator Permissions are appropriately set (Configuration OPERATOR ACCESS menu)
the operator can access and change the setpoints without the password.
INTERNAL EVENTS
Internal events fulfil two functions:
1. They allow internal instrument sources (e.g. operator softkeys) to initiate jobs
2. They allow any instrument alarm, channel alarm, timer, counter, totaliser or contact input to be ANDed or ORed
with any other source, to initiate jobs.
MATHS PACK
The maths pack option provides 24 'derived' channels (DV1 to DV24), in addition to the measuring channels. The
option is available in two levels: level 1 which provides basic arithmetic functions, and level 2 which provides ad-
vanced functions such as averaging, Relative Humidity calculations, mass flow etc. Level 2 also introduces a further
group, called the DV group, which is used to assemble channels for use in group averaging, max/min functions etc.
FUNCTIONS
The level one (basic arithmetic) functions are as follows:
Constant Multiply
Copy Divide
Add Modulus
Subtract Off
The level two functions are as follows:
Square root Relative humidity
Channel / Group / Rolling averages F value
e
x
Mass flow (linear) and square root)
log
e
x Mass flow ( square root)
10 x Zirconia probe
log
10
x Switch inputs
Rate of change High/Low select
Sample and hold Stopwatch
Channel min/max Time stamp
DV Group Latching min/max O
2
correction
DV Group Continuous min/max Percentile
Polynomial
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com