"The CPVC pipe rating, before it becomes soft enough to deform, is at least 100°C and may be up to 110°C. Additionally, this is at a general internal pipe pressure rating of 264 PSI, but this is generally derrated to 100psi above 82°C. Of course in our use, there is no internal pressure to cause it to deform so it is OK to use at higher temperatures. The design engineer understands that the bus bar reaches 105°C. He also understands the maximum ambient air temperature is 55°C in the shade per FE specification ( remember FE/Bechtel must provide sun shade for the measurement head ). When we design the head structure, the CPVC pipe and corner assemblies will be a minimum of 30cm away from the bus bar. Understanding this distance, and the temperatures, the CPVC and the corners will be at least 20°C cooler than the surface bus bar, even when directly above the bus bar. The fiberglass supports we use between the bus bar and the CPVC & Corners have a maximum operating temperature of 140°C so this is no problem
FRP PEDISTAL & SUNSHADE EST COST -> LISTPRICE
$563 Column
$480 Flat Panel
$220 Corner holder
$100 Est. SS hardware
$637 CM sunshade
$2000 estimated cost w/o eng. or inhouse labor
$6900 estimated list price ( incl. $1950 sunshade ) BGS Nov'21
Example Drawings : 
ALARM CONTACTS
The relay contacts and output are set up as a fail-safe circuit. Before the LKCO is energized, the contacts are closed.
When power is applied it then takes about 7.5 seconds before the system stabilizes and at that time the contacts will open.
Then, in the event of a detected Advanced Accuracy Diagnostics problem, the contacts will close. There are actually two relays, one for MR and one for DI. Standard LKCO configuration wires the contacts in parallel for common output.
What will trigger AD?
OSR Maintenance Required
OSR Data Invalid
PSR Maintenance Required
PSR Compensation Overrange
PSR Temperature Sensors ( via maintenance required or Data Invalid depending on severity )
If Modbus option is installed, contact may be connected to Modbus module ( contact not available otherwise ) so AD status is available digitally.
REVERSE CURRENT ALARM
The idea is to use the shunt voltage to a DPM which has both a display and setpoint alarm.
There are a couple of options from Redlion. One is the PAXLite . It has build-in dual relay and programmable set points.
https://www.redlion.net/product/paxl-universal-dc-input-meter-dual-relay-output
The other is a more premium meter with higher accuracy (0.03% as opposed to 0.1) and sunlight readable display, and build in integrator/counter. This also has more options for the setpoint such as deviation set point in addition to hi and lo Except for the option cards and upgraded display, this has similar specs to what we currently use on LKCO (DP5D), and is the direct replacement for it, since the one we now use is discontinued (until we deplete current stock).
The setpoint is realized via an add-on dual relay card that plugs in. Other cards are available such as Modbus.
https://www.redlion.net/product/pax-universal-dc-input-meter-red-display-ac-powered
Both meters have setpoint hysteresis, are capable of latching the setpoint alarm, or turning off after a set delay. The alarm trip can be delayed as well
Both meters updated at 20-times/s and the relay response is spec'ed at 4ms for a (theoretical) total response of 54ms.
We have not tested the setpoint function and should before we sell it. Aslo, one drawback of LKP systems, if the overcorrect trip is set too high, the system may saturate before the trip point is reached.
Farid
MTBF (previously provided to Fuji) : Head=20yr (@40degC=20yr), MeteringUnit=15yr (@30degC=11.25yr)
CONNECTION FIBER SPECIFICATIONS Information from FEM Sep'16
Please see the attached data sheet. The difference it seems between this and the one I provided earlier is this one stores at -55C instead of -70C (who cares) and is slightly heavier. There is no flex cycles spec, but same diameter, crush, tensile, and bend specs. All in all, it is the same cable as far as customers are concerned. The A-series cables do not show up on the manufacturer's website, so I requested clarification By the time the order is placed, Fuji may very much end with B-series cable that matches he first datasheet.
SENSOR FIBER LENGTH VERY rough fiber length est :
figure 180mm on all sides of bus and offset the compensation module (recommendation = 6.5mm/kA. plus 1m )
Example for 610mm x 400mm bus @ 100kA :
Head alone : (610+180+180)*2 + (400+180+180)*2 = 3460mm or 3.64m
+ to & from CM : 100kA x 6.5 * 2 + 1m extra = 2300mm or 2.3m
= Minimum recommended sensor fiber length 5.94m
LKCO TESTING
In-Process : Optical Subsystem including Optical Subrack
Temperature cycled for 24 hours
Function tested
Coarse setup of feedback coil
In-Process : Power Subrack
Burn-in 4+ hours
Internal voltages, feedback (closed-loop) amplifiers and AD configured and function checked
In-Process : Assembled System
Interconnnection cable prepared and Hi-Pot tested to 3.4kV DC for 1 minute
Compensation Coil Hi-Pot tested to 3.4kV for 1 minute
In-Process : Final Test and Calibration
Metering unit internal voltages and temperature sensors function checked
Coarse calibration completed "cold"
System placed on test stand operating under full scale current for Burn-in 4+ hours
Final System calibration completed "hot" including linearity to worksheet and product specifications
Type Testing : External Laboratory for dielectric
EN61010-1 Protection against electric shock
Type Testing : External Laboratory for EMC
EN61000-3-2, Harmonic Current Emissions
EN61000-3-3 Voltages Fluctuations / Flicker
EN61000-4-2 Electrostatic Discharge Immunity
EN61000-4-3 Radiated. Radio-Frequency Electromagnetic Field Immunity
EN61000-4-4 Electrical Fast Transient/Burst Immunity
EN61000-4-5 Surge Immunity
EN61000-4-6 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields
EN61000-4-8 Power Frequency Magnetic Field Immunity
EN61000-4-11 Voltage Dips, Short Interruptions and Voltage Variations Immunity
LKCO TEMPERATURE COMPENSATION - sensor in CM and networked sensors in measurement head
LKCO temperature compensation changed from 4-segments up to 5-segments some time ago, well before the ALBA PL6 systems.
What changed between the two ALBA systems ( mid-2018 serial numbers ) was the top temperature in the top segment
The temperature compensation segments are generally ( actual per system profiling may not hit temps exactly )
PL6 till mid'18 after mid'18
-22...-6C same
-6...9C same
9---24C same
24...39C same
39...55C 39...65C
Since the feedback current in the compensation module typically heats it 10C over the ambient temperature, the CM is quite often above 39C.
2021 : Jim Blake has some concern about the glass jacketing above 50 or 55C such that we might be creating issues profiling that high.
Additionally, JB said there was some serous fiber jacket issues 2018 ( caused big issues in the cold at RET/Mongolia )