Procedure to reduce a volume of data of a field device to be transmitted, wherein the field device captures values of at least one process variable (h), wherein the field device has a communication connection with a network participant (BE, GW) via a communication network and is designed to transmit the captured values of the process variables (h) to the network participant (BE, GW), wherein the current value of the process variable (h) is checked at set times (t), wherein said set times (t) particularly have a constant time difference in relation to one another, wherein in the course of the verification, a value of the process variable (h(t 1)) at a first time (t 1) - said first time corresponding to the time of the verification - is compared to the value of the process variable (h(t 2)) of a second time (t 2), the second time (t 2) being the time before the first time (t 1), and wherein the value (h(t 1)) of the process variable (h) of the first time (t 1) is only then transmitted if the value of the difference between the value (h(t 1)) of the process variable (h) of the first time (t 1) and the value (h(t 2)) of the process variable (h) of the second time (t 2) is greater or equal to a predefined first value (Δh 1), characterized in that the value (h(t 1)) of the process variable (h) of the first time (t 1) is only then transmitted if additionally the value of the difference between the value (h(t 1)) of the process variable (h) of the first time (t 1) and the value (h(t 2)) of the process variable (h) of the second time (t 2) deviates by at least a predetermined factor from a value of a difference between the value (h(t 2)) of the process variable (h) of the second time (t 2) and a value (h(t 3)) of the process variable (h) of a third time (t 3), - said third time (t 3) being the time before the second time (t 2) - wherein in the event that the value of the difference between the value (h(t 1)) of the process variable (h) of the first time (t 1) and the value of the process variable (h) of the second time (t 2) is greater than or equal to a predefined second value (Δh 2) - the second value (Δh 2) being greater than the first value (Δh 1) - the value (h(t 2)) of the process variable (h) of the second time (t 2) is also transmitted. wherein the field device captures values of at least one process variable (h), wherein the field device has a communication connection with a network participant (BE, GW) via a communication network and is designed to transmit the captured values of the process variables (h) to the network participant (BE, GW), wherein the current value of the process variable (h) is checked at set times (t), wherein said set times (t) particularly have a constant time difference in relation to one another, wherein in the course of the verification, a value of the process variable (h(t 1)) at a first time (t 1) - said first time corresponding to the time of the verification - is compared to the value of the process variable (h(t 2)) of a second time (t 2), the second time (t 2) being the time before the first time (t 1), and wherein the value (h(t 1)) of the process variable (h) of the first time (t 1) is only then transmitted if the value of the difference between the value (h(t 1)) of the process variable (h) of the first time (t 1) and the value (h(t 2)) of the process variable (h) of the second time (t 2) is greater or equal to a predefined first value (Δh 1), characterized in that the value (h(t 1)) of the process variable (h) of the first time (t 1) is only then transmitted if additionally the value of the difference between the value (h(t 1)) of the process variable (h) of the first time (t 1) and the value (h(t 2)) of the process variable (h) of the second time (t 2) deviates by at least a predetermined factor from a value of a difference between the value (h(t 2)) of the process variable (h) of the second time (t 2) and a value (h(t 3)) of the process variable (h) of a third time (t 3), - said third time (t 3) being the time before the second time (t 2) - wherein in the event that the value of the difference between the value (h(t 1)) of the process variable (h) of the first time (t 1) and the value of the process variable (h) of the second time (t 2) is greater than or equal to a predefined second value (Δh 2) - the second value (Δh 2) being greater than the first value (Δh 1) - the value (h(t 2)) of the process variable (h) of the second time (t 2) is also transmitted.