Fahrenheit to Celsius

[tweaker]

Hi all

I have a problem, we have a Infratec RMS AD1 Appliance with 3 temp. sensors. I can check the temp. sensors with SNMP but I have fahrenheit and I need celius. How I can convert this to celsius?

I know the formula:
fahrenheit to celsius = ( TFahrenheit - 32 ) × 5 / 9
or
fahrenheit in celsius = ( TFahrenheit - 32 ) × 1.8

I have already an item:
Description: Temp Serverraum Test
Type: SNMPv1 agent
SNMP community: public
SNMP OID: .1.3.6.1.4.1.1909.10.4.1.1.3.2
SNMP port: 161
Key: temp_serverraum_test
Type of information: Numeric (integer 64bit)
Units: C
Use multiplier: Do not use
Update interval (in sec): 30
Keep history (in days): 90
Keep trends (in days): 365
Status: Active
Store value: As is
Show value: As is

And a trigger:
Name: Temp. Warung - Serverraum - Test
Expression: {Template_Infratec:temp_serverraum_test.last(0)>84
The trigger depends on: No dependences defined
Event generation: Normal

I tried to inetgrate the formula in the trigger but i need this in my item to visibel it or not? How can i solve my problem? I need the celius value in my SMS and in my graph.

Trigger test with formula:
Expression: ({Template_Infratec:temp_serverraum_test.last(0)}-32)*5/9<30

[Tenzer]

You can't convert that in the item, which would be the correct place in order to change it throughout the system, due to you having to subtract a value. The items only allow for you to specify a multiplier. I guess you could put in "1.8" as the multiplier, but then you have to subtract 32 when reading the numbers.

[mpotter-xiss]

Hi all

I have a problem, we have a Infratec RMS AD1 Appliance with 3 temp. sensors. I can check the temp. sensors with SNMP but I have fahrenheit and I need celius. How I can convert this to celsius?

I know the formula:
fahrenheit to celsius = ( TFahrenheit - 32 ) × 5 / 9
or
fahrenheit in celsius = ( TFahrenheit - 32 ) × 1.8

I have already an item:
Description: Temp Serverraum Test
Type: SNMPv1 agent
SNMP community: public
SNMP OID: .1.3.6.1.4.1.1909.10.4.1.1.3.2
SNMP port: 161
Key: temp_serverraum_test
Type of information: Numeric (integer 64bit)
Units: C
Use multiplier: Do not use
Update interval (in sec): 30
Keep history (in days): 90
Keep trends (in days): 365
Status: Active
Store value: As is
Show value: As is

And a trigger:
Name: Temp. Warung - Serverraum - Test
Expression: {Template_Infratec:temp_serverraum_test.last(0)>84
The trigger depends on: No dependences defined
Event generation: Normal

I tried to inetgrate the formula in the trigger but i need this in my item to visibel it or not? How can i solve my problem? I need the celius value in my SMS and in my graph.

Trigger test with formula:
Expression: ({Template_Infratec:temp_serverraum_test.last(0)}-32)*5/9<30

You could write a quick script for your check and have use it as an external check in Zabbix. Use snmpget to grab the data, do a quick conversion, and then have the script give Zabbix the temp Celsius.

I glanced at the pdf for the device just now and it didn't mention temp Fahrenheit at all. All the values in the manual are given in C. Is there a configurable option to report temp F or C?

[nelsonab]

You can't convert that in the item, which would be the correct place in order to change it throughout the system, due to you having to subtract a value. The items only allow for you to specify a multiplier. I guess you could put in "1.8" as the multiplier, but then you have to subtract 32 when reading the numbers.

When you look at the formula field in the DB you'd think it's possible. This may warrant closer inspection.

[tweaker]

Hi all

Thx for the advices. I will write a Scipt an Post it here when I have done.

@mpotter-xiss
Yes you are absolutly right. In the config of the Infratec appliance you can choos between fahrenheit or celsius, but the problem is one temp. Sensor is outside and now its outside <0 celsius and then I receive strange values like "0.045872467878". So I have to use fahrenheit.

thx @all
Tweaker