Symptoms
Fleet operators report intermittent 'Sensor Lost' alerts on FX-equipped Hyster H50FT and Yale GLC050 lift trucks, typically within 90 seconds of engine start.
Root Cause
The FX receiver ships with a factory antenna gain of 3 dBi. When mounted inside the operator cab on Hyster/Yale chassis, the steel roof cage attenuates the 433 MHz uplink from wheel-mounted sensors by 12–18 dB. Compounding this, forklift telematics units broadcasting on 2.4 GHz can desensitize the receiver front end.
Resolution
- Relocate the FX receiver to the overhead guard crossmember using bracket kit PP-FX-BRK-02.
- Route the antenna coax outside the cab, keeping at least 8 in. of separation from any 2.4 GHz radio.
- In the PressurePro Fleet Console, set 'Signal Timeout Grace' to 180 seconds for the affected asset class.
- Confirm RSSI ≥ -78 dBm on all four sensors before returning the truck to service.
Verification
Run the FX Diagnostic Sweep from the handheld programmer. All sensors should report 'GREEN' for two consecutive 10-minute cycles.