CHY FIREMATE CO. LTD. RF915 User Manual

alternate of thermocouple by pressing K/J key switch. 

The K/J key switches the T1 input to select the 

K-type or J-type thermocouple as input, when main dis-
play input selected T1. When the thermometer is turned 
on, it is set to the type selected that was in use when the 
thermometer was last turned off. 

Press MIN MAX key to enter the MIN MAX re-

cording mode, (displays the Maximum reading with 
time, Minimum reading with time and Average reading 
stored in recording mode). In the this mode the auto-
matic power-off feature is disabled and 

  key, °C/°F 

key, REL key, SET key, Hi/Lo Limits key and main 
display T1 T2 T1-T2 key, K/J key are disabled. The 
beeper emits a tone when a new minimum or maximum 
value is recorded. 

Push MIN MAX key to cycle through the MAX, 

MIN and AVG readings. If an overload is recorded, the 
averaging function is stopped. In this mode, press 
HOLD key to stop the recording of readings, all values 
are frozen, press again to restart recording. 

To prevent accidental loss of MIN, MAX and AVG 

data, in this mode can only be cancelled by pressing and 
hold down the MIN MAX key for 2 seconds to exit and 
erased recorded readings. 

Press REL key to enter the Relative mode, zero the 

display, and store the displayed Reading as a reference 
value and annunciator REL is displayed. Press REL key 
again to exit the relative mode. The relative value can 
also be entered by the user. (See “SET mode” later in 
this manual). When the desired Relative value has been 
entered, press REL key to enter the Relative mode, 
press SET key use set Relative value as a reference 
value. Press REL key again to exit the relative mode. In 
the Relative mode, the value (can not >±3000.0 counts) 
shown on the LCD is always the difference between the 
stored reference and the present reading. 

Read the third displayed (Time) in either second or 

minute. When the thermometer turned on, it is set to 
second. To change the Time scale, press sec. Minu. key. 
Maximum Time reading is 100 hours. If 100 hours is 
exceeded, reset Time to zero and restart. 

9.1 Press SET key to enter Relative values SET mode 

(Press ENTER key can escape relative values set 
mode), REL set mode. = = = =.= is displayed in 
main display. Relative value is entered via overlay 
numbers, then press overlay ENTER key, stored the 
relative value, enter Time set mode. 

9.2 Time set mode, (Press ENTER key can escape Time 

set mode) =.= = = : = = is displayed in second and 
third display. Time (hours, minutes, seconds) value 
is entered via overlay numbers, then press overlay 
ENTER key. Time starts from set time value, enter 
Hi/Lo Limits value set mode. 

9.3 Hi Limit value set mode, 

 is displayed (Press 

ENTER key can escape Hi Limit value set mode), = 
= = =.= is displayed in main display, Hi Limit value 
is entered via overlay numbers, then press overlay 
ENTER key, stored the Hi Limit value, enter Lo 
Limit value set mode (Press ENTER key can escape 
Lo Limit value set mode). = = = =.= is displayed in 
main display, Lo Limit value is entered via overlay 
numbers, then press overlay ENTER key, stored the 
Lo Limit value and exit SET mode. 

9.4 When the thermometer is turned on. The Relative 

set value and Hi/Lo Limits set value that was in use 
when thermometer was last turned off set values. 

The input selection indicates which input is selected 

for second display; T1 thermocouple, T2 thermocouple 
or the difference between the two thermocouples 
(T1-T2), when the thermometer is turned on, it is set to 
T2 input can select alternate of thermocouple by second 
display K/J key switch. 

The K/J key switches the T2 input to select the 

K-type or J-type thermocouple as input, when second 
display input selected T2. When the thermometer is 
turned on, it is set to the type selected that was in use 
when the thermometer was last turned off. 

Press Hi/Lo Limits key to enter the Hi/Lo Limits 

comparative mode, 

  is displayed. When input tem-

perature value exceed Hi or Lo Limits value. The beeper 
emits a continuity pulse tone, press Hi/Lo Limits key 
again to exit the Hi/Lo Limits mode. 

13. WIRELESS MODE: 

(802W/802UW)

 

Pressing 

 key over two seconds to start wireless 

function and pressing 

  again for another two seconds 

to stop wireless function. The wireless mode will shunt 
down if there is no wireless signal for two minutes. 

SET CH/ID to 00,00, pressing Hi/Lo Limits key and 

 power key over six seconds when the meter shuts 

down sand then the meter will set channel and ID to 
00,00 status. The second display will appear 00, which 
means that the channel and ID has been set to 00.

To avoid possible electrical shock, disconnect the 

thermocouple connectors from the thermometer before 

removing the cover.

1. Power is supplied by 4pcs 1.5V (SIZE AAA) UM-4 

R03. 

2. The “

” appears on the LCD display when replace-

ment is needed. To replace battery remove screw from 
back of meter and lift off the battery cover. 

3. Remove the battery from battery contacts and replace. 
4. When not use for long time remove battery. 
5. Don’t keep in place with high Temp, or high humidity. 
 

Periodically wipe the case with a damp cloth and deter-

gent, do not use abrasives or solvents. 

 

 
*Software operation manual is in the software disk. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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