ENMET IR-6000 - Manual (Page 7)

IR-6000 Hydrocarbon Sensor/Transmitter ENMET Corporation
5
4.0 Operation
4.1 Normal Operation
Clean Environment Using MX-Series Controller:
After power is applied, the IR-6000 enters an initial one (1) minute warm-up period before the normal operation begins.
A 4–20 mA signal corresponds to the detected gas concentration. See Table 2.
The 4–20 mA output of the IR-6000 is a non-isolated current source.
Table 2: Current Output and Corresponding Gas Concentration
Current Output Status
0.0 mA Unit Fault (-25%)
0.2 mA Reference Channel Fault (-23.75%)
0.4 mA Analytical Channel Fault (-22.50%)
0.8 mA Unit warm-up (-20%)
1.0 mA Optics Fault (-18.75%)
1.2 mA Zero Drift Fault (-17.50%)
1.6 mA Calibration Fault (-15%)
2.0 mA Unit Spanning (-12.50%)
2.2 mA Unit Zeroing (-11.25%)
4.0 mA Zero gas level (0%LEL) or 0% by Vol.
5.6 mA (10%LEL) or 10% by Vol.
8.0 mA (25%LEL) or 25% by Vol.
12 mA (50%LEL) or 50% by Vol.
16 mA (75%LEL) or 75% by Vol.
20 mA Full scale (100% LEL) or 100% by Vol.
20.1- 23 mA Over-range
5.0 Maintenance
◆
Clean Environment, Operation Utilizing MX-Series Controllers or Similar System Devices
The IR-6000 does not normally require cleaning of the optics.
◆
Dirty or Dusty Environment
If the unit is operating in a very dirty or dusty environment, the optical path might become obscured. If the obscuration is severe
enough to affect the unit’s accuracy, the unit will activate an “Optics Fault”. This fault would typically be indicated by a fault
relay activation on a control panel and possibly a negative reading on a display, –
X X X . To clear an Optics Fault, first try a
zero calibration. If the zero calibration does not correct the fault condition, try to clean the optics.
C AUTION : Cleaning the optics should be preformed by qualified personal
The outer barrel (tube with two sets of holes) can be removed (unscrewed) to inspect the cleanliness of the hydrophobic filter.
The hydrophobic filter is a Teflon coated stainless steel mesh that keeps moisture and particulates out of the optical path. A set
screw holds the filter to the
IR-6000 housing. Once the hydrophobic filter is removed, the internal waveguide tube should be
inspected for cleanliness. The waveguide and waveguide collar can be removed by inserting rigid instruments such as Allen
wrenches into one hole of the waveguide and one hole of the collar. Turning the two instruments in opposite directions will
loosen the waveguide allowing the collar to be screwed down on to the waveguide until it can be removed from the
IR-6000
housing. This will allow the windows of the IR-6000 to be cleaned. Dust can be removed using compressed air. Hard or oily
deposits can be removed using Isopropyl alcohol and cotton tipped swabs. Wipe any film or residue or film left by the alcohol
on the windows with a clean dry cotton swab. The internal electro polished wave-guide tube can be cleaned the same way. Be
careful not to leave any particles of the cleaning swab in the waveguide. The waveguide holes can collect pieces of the
cleaning swab. After reassembling the unit (the waveguide and collar should be very tight to both ends of the
IR-6000 housing
after installation). Once the unit is completely reassembled and power is reapplied, the IR-6000 must be calibrated. Refer to
the zero calibration section of this manual.