Currently the only FieldPoint modules that offer differential measurements are the (c)FP-TC-120, (c)FP-DI-330 and FP-QUAD-510. However, the (c)FP-TC-120 module, while being differential, can not handle more than a couple of volts of common mode voltage between channels. Whereas most FieldPoint modules are single ended, if you only use one channel on the module, it is differential since the modules have a floating common.
There are currently no modules that offer measurements of more than 24 milliamps.
Regards,
Aaron