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differential instrumentation amplifier question

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Metatronics

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Hello,

I am trying to make an amplifier to amplify a low current differential sensor voltage. The sensors I am going to use are pH, Redox and several ion-selective sensors. I did some extensive research and all signs point to the IDA116 from burr-brown. The thing is I dont have a negative voltage in my system.

My question is: How can i get this amplifier to work without a -15v power supply? (i do have +24v) I tried to alter the reference voltage but with no succes. I included a little schematic of the connections i made. Im not a die-hard in analog electronics so problaby its crap :D

The biggest drawback is that a also have some other sensors that provide a solid ground to the solution I am measuring so any voltage offset i create on the sensor flows away through the liquid instead of helping my measeurements.

Does anyone have usefull tips on this matter?

thanks in advance

Ps. in the circuit, the output of the op07 op-amp is connected to the reference input on the INA116.
 

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