Specialty Systems Field Notes — EPS Gensets, Fisher Lab Refrigerator, Fotokite Roof Box, Hologic Mobile Mammography

EPS J-20T4 / J-30T4 diesel gensets (Engine Power Source)

EPS is Engine Power Source of Rock Hill, SC. Their J-20T4 and J-30T4 are the vehicle-mounted diesel generator sets on several coaches: Kubota Tier 4 turbo-diesel engines (3-cylinder D1803TI on the J-20, 4-cylinder V2403TI on the J-30, both 1800 RPM) driving Marathon generator ends rated roughly 19.4 kW and 27.9 kW continuous at 120/240 V. Full-load fuel burn is about 1.5 and 2.1 US gal/hr respectively.

Operating rules: ultra-low-sulfur diesel only and never biodiesel; API CJ-4 (or ACEA-E9) engine oil - using anything else voids the engine warranty. Before any work on the electrical panel or the genset itself, disconnect the positive battery cable. The Tier 4 engine uses a high-pressure common-rail fuel system: no part of it may ever be adjusted in the field.

Routine attention (from the factory service table): change oil and filter at the first 50 hours, then every 400 hours; drain the water separator every 50 hours and replace both fuel filters at 500 hours; inspect and clean the fuel pump pre-filter (50/100 h); clean the air filter at 250 hours and replace the element yearly; inspect belts at 250 hours, change at 500; check coolant level every 100 hours and replace coolant, hoses, air hoses, fuel lines, and battery on a 2-year cycle; keep the radiator core clean (a plugged core is the classic overheating cause - clean it gently with a garden-hose sprayer, and never open a hot radiator). Common part numbers: oil filter HH164-32430, water-in-fuel element 1J430-43060, secondary fuel filter HH1J0-43170, fan belt NAPA 3VX335, Shell Rotella 15W-40 oil, Shellzone 50/50 coolant.

Call Farber for anything involving the common-rail fuel system, electrical panel faults, exhaust leaks (sooty deposits around joints), or repeated shutdowns - and give them the engine serial number.

Fisher Scientific FBG505SA laboratory refrigerator

The FBG505SA is a 5.5 cu ft (156 L) undercounter, laboratory-grade general-purpose refrigerator used for specimen and supply storage on medical coaches. It is thermoelectric (no compressor, R744/CO2 based, forced-air), holds +2 to +9 C in 0.5 C steps, and runs on 100-240 V at about 4 A. It has audible/visual alarms for temperature out of range, door ajar, power loss, and low battery, plus remote alarm terminals, and a 25 mm rear access port for a monitoring probe.

Routine attention: it is indoor-rated and needs good ventilation and a 10-32 C ambient - do not box it in tightly or let the bay overheat. Keep the door gasket clean (it has a perimeter heater), verify the leveling feet after the coach moves bases, and test the door-ajar and temperature alarms periodically. If the unit alarms for temperature and the ambient/ventilation checks pass, take it out of service and call Farber; there is no field-serviceable refrigeration circuit.

Fotokite Sigma Roof Top Box (tethered drone)

The Roof Top Box (RTB) is a 65 lb roof enclosure whose lids open so the tethered Fotokite Sigma kite can launch for persistent overhead video. Power is the critical integration: it draws up to 55 A at 12 V (about 700 W) at takeoff, sleeps below 12.4 V input, and wakes above 13.1 V, so it expects the engine (or a managed shore-power scheme) to be running; a 220 A-class alternator and a 60 A breaker near the battery are the baseline. A physical emergency-land button is installed near the operator, and an 8 mm hex drive (kept with the vehicle) opens the lids manually without power - use a drill on low speed with a torque limit and engage the clutch by pushing in.

Routine attention: after any manual lid opening, run the Lid Calibration Test, and after electrical work run the RTB Installation Test (both from a browser at 192.168.2.100:7357 with the tablet or a laptop on ETH3; tests may need two runs to record a pass). Confirm threadlocker on mounting hardware at inspection, keep the shell seal intact, and verify the emergency-land button works. Flight operations, kite servicing, and SIM/APN changes follow Fotokite's own documentation (manual.fotokite.com, support@fotokite.com); call Farber for mounting, power, and vehicle-integration issues.

Hologic Selenia Dimensions - mobile mammography site basics

Mammography coaches carry a Hologic Selenia Dimensions system whose selenium X-ray detector is sensitive to magnetic interference, so where the coach parks and how power is arranged matter as much as the equipment. Key rules from Hologic's site planning and EMI bulletins: the coach needs a stable power source - shore power is best; a generator must sit at least 3 m (10 ft) from the detector and intermittently supply 65 A at 208 VAC; a dual-conversion UPS/line conditioner carries the system, and the best UPS location is at the front of the coach near the driver, never within 10 ft of the detector. Interior temperature and humidity must be maintained at all times, including between clinics.

Parking and EMI: do not park near power transmission lines, outdoor transformers, or other high-power sources; dynamic 60 Hz fields (AC power lines) are the main image-quality threat, while static fields like the earth's are harmless. Hologic's screening threshold is an ELF reading under 0.8 milligauss (30 Hz-2 kHz) with no abnormal variance - and their field experience is that moving the equipment or the coach a short distance is usually the cheapest fix, while shielding is expensive and often ineffective. DC fluorescent dimmers and light dimmers in coaches are known offenders.

Division of labor: streaky or noisy images at one venue only = suspect the parking spot/EMI first and relocate; detector, gantry, or X-ray faults are Hologic service territory; coach power, UPS, HVAC, and generator issues are Farber work.