The phrase "a representative on hand" is correct and usable in written English.
It can be used to indicate that a representative is present and available for assistance or inquiries.
Example: "During the event, there will be a representative on hand to answer any questions attendees may have."
Alternatives: "a representative available" or "a representative present".
There is usually a WSE representative on hand to assist with inquiries.
So it was a great treat to try three wines from each of these five producers, and to talk briefly with the winemaker or winery representative on hand from each of these producers.
The two parties will invite the Governments of Jordan and Egypt to participate in establishing further liaison and cooperation arrangements between the Government of Israel and the Palestinian representatives on one hand, and the Governments of Jordan and Egypt, on the other hand, to promote cooperation between them.
As the latest high-profile company to enter the town, in April, YCI hosted a crawfish boil with company representatives on hand to answer questions about the plant.
G.M., the Treasury Department, the United Automobile Workers, suppliers, dealers and other vendors all will have legal representatives on hand, meaning a full house in the New York bankruptcy court where the case is likely to be heard.
To make the most of this idea, have ample service representatives on hand to answer questions and teach customers a little more about what you could be doing for them.
The Restoration Project says it will have representatives on hand at the giveaways to explain how to plant a tree and maximize its chances of survival.
Some attendees argued — for the most part politely — with the university representatives on hand to answer questions.
Dr. Nevan Hanumara of the MIT Tata Center was among the representatives on hand to greet these students, many of whom were traveling outside of India for the first time.
