Try this...
SELECT
AlarmEventTransactionTableTable.TxnID,
CASE
WHEN DeviceID IN('7', '10', '62', '58', '60',
'46', '48', '50', '137', '139',
'142', '143', '164') THEN '01'
WHEN DeviceID IN('8', '9', '63', '59', '61',
'47', '49', '51', '138', '140',
'141', '144', '165') THEN '02'
ELSE 'NA' END AS clocking,
AlarmEventTransactionTable.DateTimeOfTxn
FROM
multiMAXTxn.dbo.AlarmEventTransactionTable
Just remove highlighted string