You don't need I/O pin (d8) for PS (TSYS01-pin-16) That pin is SPI/I2C select and should be tied to ground for SPI. You are not going to switch from SPI to I2C in the middle of your program so just connect PS to ground. You should use arduino pin-10 for your primary chip select (CSB1). Also your schematic isn't exactly correct is it? You are showing two CSB pins implying you have two chips (each chip only has one CSB , pin-2). You should redraw it showing two chips The schematic you already posted for two chips has too much information. We only want exactly what you did here with one small change: show two chips and show the two arduino chip selects (pin-10 =primaray,pin, one of the pins in the group 6-9 as the secondary chip select, ie: d6)
Get rid of this (tie pin-16 to ground)
const int protocolSelect = 8; // PS pin
Change this:
const int chipSelectPin = 7; //pin 7 is Chip select1 as there are two sensors on my board
and redraw your schematic showing two temp chips.